Top Circuits Page 83
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This is a simple - easy to build - transistor based motorcycle alarm. It`s designed to work at 12-volts. But - if you change the relay for one with a 6-volt coil - it`ll protect your "Classic Bike". The standby current is virtually zero - so it won`t drain....
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These are two - easy to build - relay-based alarms. You can use them to protect your motorcycle - but they have many more applications. If you use relays with 6-volt coils - they`ll protect your "Classic Bike". Both alarms are very small. The completed....
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This FM radio-controlled anti- theft alarm can be used with any vehicle having 6- to 12-volt DC supply system. The mini VHF, FM transmitter is fitted in the vehicle at night when it is parked in the car porch or car park. The receiver unit with CXA1019, a....
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It's a great convenience that most modern cars come with a built in alarm, however it is nothing but noise pollution that the horn sounds when the alarm is armed. Disconnecting the alarm system from the horn relay will eliminate this, but prevent the horn....
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This paragraph Easy Car Alarm circuit with the use of fewer components, easy to produce and so on. (1) circuit automobile anti-theft alarm circuit by the time base circuit NE555, power switch VT, the switch S2, the..
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Circuit works: lC1 is lock ASIC 5C058. Its 1-6 feet were even outside the key switch to the positive power supply, which is six valid key input, open lock A-F must comply with this order. 7 feet for the negative power. 8 feet false key input terminal, even....
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As shown is 555 more cars with alarm circuit, mainly consists of a 555 and a quad 2-input NAND gate circuit. At the time of low oil pressure and brake pressure is too low, the ..
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This is the basic fm trasmitter that I built. In theory, according to electronics, it shouldn't work but works fine and is very sensitive. It can transmit the signal up to 45 yards (about 40 meters) . A sensitive FM radio can pick up the signal up to 100....
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This project is a miniature, VHF FM (wideband) Wireless Microphone transmitter of the type that are commonly refered to as BUG's. Note that "BUGS" are illegal but "Wide-Band Frequency Modulation Wireless Microphones" (WBFMWMs) are not, as so many people have....
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This Mini FM Bug Detector is basically a broad-band receiver. It picks up the complete band from below 80Mhz to 150MHz and almost anything that transmits in that band will be detected. If a bug with a sensitive microphone is transmitting nearby, the result....
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This is just one of the many bugging devices available on the eaves-dropping market. The range includes pen and pencil holders, trophies, framed pictures and office furniture with false bottom drawers.
These products are readily sold to fledgling companies,....
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The 1996 Suzuki Esteem Cooling Fan system consists of control relay for: radiator fan (located in relay box), air conditioning fan motor, radiator fan motor, condenser fan motor, junction box, fuse and relay box, engine control module. The following circuit....
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Over time, many things can cause electrical problems with your Mustang. Components will get old and worn or a wire can rub against something and expose the wire to metal. I have seen where a body shop will inadvertently crimp a wire when they install a body....
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This is a 12V battery checker circuit that uses 3 LEDs that light up at their respective voltages. The red LED lights up when the battery voltage is between 8 to 10V, the orange one at voltages between 10. 5V to 12V and the green one when the battery voltage....
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This circuit operates with 230v. you can use this circuit to decorate your parties. I think this will be a wonderful circuit to you all. Here DIAC ER 900 and Triac BTW 11-400. ..
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The circuit can be used for switching OFF a particular lamp or group of lamps in response to the varying ambient light levels. The unit once built can be used for switching OFF a lamp when dawn breaks and switching it ON when dusk sets in. The power supply....
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Heat sensor circuit can be used to control any device using heat sensor. In this circuit a thermistor and a resistance is connected in series. This arrangement makes a potential divider circuit. Here the thermistor is Negative Temperature Coefficient type.....
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A wonderful diy gsm jammer or cellular mobile phone jammer schematic diagram for use only in GSM1900 with frequency from 1930 MHz to 1990 MHz. The GSM1900 cellular cell phone network is made use of by USA, Canada and most of the nations in South America.....
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This week was spent completing a number of different objectives. Firstly, the software was downloaded to design the schematic for the circuit to be translated onto a PCB. Much of the week was spent doing tutorials and learning the user interface to make a....
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The mechanical chassis prototype, as can be seen from the image on the left, was made using two materials: foam and aluminium. Foam was chosen due to its easy manipulation and aluminium due to its excellent strength to weight ratio. The prototype includes a....
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Although our kit utilizes an off-the-shelf microcontroller (AtMega328P-PU based Arduino), we additionally designed a simplified version. This allows other collaborators and students to potentially replicate, or modify the project and eventually fabricate....
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LM3914 Dot Bar Display Driver LM3914 is a monolithic integrated circuit that senses analog voltage levels and drives 20 Led stereo Vu Metre Devresi PCB Circuit LM3914 10 leds stereo vumeter circuit diagram of Eagle PCB drawing of eagle ..
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The 3D printer requires separate control for three independent axis. Each of the controlled axis must have a high precision electronic driver. Mechanical part of the each axis is based on a precise bipolar stepper motor connected to a drive shaft via claw....
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The functional generator is a device that would have any better equipped electronic lab should have a not so frequently used gadgets, but when you need it, we certainly appreciate its convenience. Here is the procedure of the scheme, which was published in....
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This is one of mine projects which can be helpful for controlling water level in water tank. I made it on one of Atarado SMART prototyping PCB for which I can tell all the best. Controller for water tank managing water pump and take care of water level. This....
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The Star Delta starting method is a motor starting mechanism that minimizes the large amount of starting current that motors draw in. The Star Delta, as the name suggests basically involves feeding the motor with 1/sq. root3 (58%) of the full load current....
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The circuit in this figure is protecting the circuit and the system with power supplies that may exceed safe limits. One example is small consumer products that use external ac adapters; its easy to mistakenly plug in the wrong adapter. Another example is a....
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30W Class AB power amplifier circuit diagram using power transistor. Set the above amplifier up by adjust the variable resistor R1 to maximum and R12 to zero. After this set up is done, the activate / turn on the amplifier. Adjust the R1 so that the measured....
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Here a single IC 556 has been incorporated for creating the PWM pulses. One half of the IC has been configured as the high frequency generator for feeding the other half IC which is rigged as a pulse width modulator. The sample modulating frequency is....
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This is an IR remote control for Nikon cameras. It is compatible with the Nikon ML-L3 remote control. Supported cameras include: D40, D40X, D50, D60, D70, D70s, D80, Coolpix 8400 8800. This design is based on an idea from The circuit is extremely simple: an....
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I like to see lights move to music. This project will indicate the volume level of the audio going to your speakers by lighting up LEDS. The LEDS can be any color so mix them up and really make it look good. The input of the circuit is connected to the....
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This circuit generates high voltage pulses from 230vac line voltage. The drive end`s swing comparator circuit is invented by the creator of this page. The work end is derived from stroboscope trig supply circuit. All line voltage using circuits are....
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Above is a schematic diagram of an LM741 light/dark sensor circuit (from the excellent 741 Op-Amp Tutorial by Tony van Roon).The ECG128/NTE128 transistor stipulated can be substituted with any NPN transistor rated at sufficient gain and current for the....
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When I got the car I was relieved that it didn`t "chirp" or blare the horn every time I locked or unlocked the doors. Let`s face it, there are times when we don`t want our comings and goings announced in such a tactless manner. Still, I found that in the....
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My door alarm is a small device which sounds an alarm whenever the door is opened. It is ideally used when you want privacy, if you want to know if other people enter your room while you’re in another part of the house, to wake you up if someone enters your....
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When the power supply input to IC1 is the output pin 3 at a frequency of 1 kHz. The frequency is Q1 and Q2, which will continue to use push pool work interchangeably. If this is the positive output signal Q1 Q2 will run the delete function this reason, C2....
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Renewable Energy Discussion on various alternative energy, renewable energy, & free energy technologies. Also any discussion about the environment, global warming, and other related topics are welcome here. I will just mention a few things in here which....
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The balloon went to 103, 258 ft peak reported altitude. Many items had to be considered for launching payload to this range. Unlike building an electronics package to operate at Sea Level, items such as air pressure, temperature, relative humidity and even....
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Nowadays, USBis the most popular connection connection between PC and peripherals such as AVR programmers, printers, scanners etc. For that reason I had to modify my old serial AVR In-System-Programmer (ISP) to work with USB connection. You can say, "use a....
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This FM radio-controlled anti- annexation anxiety can be acclimated with any agent accepting 6- to 12-volt DC accumulation system. The mini VHF, FM transmitteris adapted in the agent at night back it is anchored in the car balustrade orcar park. The receiver....
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This circuit shows a DS1236 that is used to monitor and control the power-supply and software execution of a processor-based system, and to provide a pushbutton reset. When an out-of-tolerance condition occurs (when VCC is below 4. 5 V for 10% operation, or....
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The above circuit uses RS232 for interfacing with PC. It is very simple circuit & works very well with PC. Power is drawn from usb port OR needs external supply of 5V. The value of the crystal is very critical at AT89C2051 and must be 11. 0592MHz. Here....
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F232 is USB powered, but you need to have a level translator at the output of F232. Tx of f232 has to be converted to RS232 levels, since the other side has a max. Receive pin can be easily opto-ed. But the transmit pin, need to have a supply in line with....
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Personal Safes are revolutionary locking storage cases that open with just the touch of your finger. These products are designed as "access denial" secure storage for medications, jewelry, weapons, documents, and other valuable or potentially harmful items.....
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Now-a-days every institution needs automation. As a part of college automation, we have decided to do a project Voice Interactive System for College Automation . Our project allows the user to know the student`s attendance and marks quickly through the....
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This circuit uses an 87C57 microcontroller and a few peripherals to condition X-10 power-line carrier-code formats from a personal computer to use an X-10 power-line interface in a home-control system. Software details are available in the reference.....
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I have designed this high voltage, low current power supply for various experiments in systems & synthetic biology. I have cleaned up the design and I am placing the schematic and board layout online below! This circuit outputs up to +1, 866VDC at under 1 mA....
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If both the reading are high then the diode is short. If both the readings are Low then the diode is open. If any of read pins are low and the second is high then the diode is good. This concept can be easily extended to test a transistor by realizing that a....
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I would like to thank you`s for the manual that i purchased, it is as stated, i am now able to continue with my TV to complete it. I will be using your service for all the manuals that i will need, once again thank you very much. Kind regards Lazlo Most....
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The program makes use of the built-in AD converter of the PIC16F874 for sensing the touch buttons. The PIC has 8 AD ports, seven are used for the 7 touch-buttons, 1 is used for the light measurement. In order to receive DCF signals, you have to add a DCF....
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This device was designed to replace the original digital clock in a Fiat Ducato 1992-1994, mounted just above the inside rearview mirror. The original clock is not very accurate, only displays time and is sensitive to interference (e. g. from Xenon....
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A car courtesy light in a standard car without a board computer is often a very simple thing: you open the door, the interior light is switched on, you close the door, the light is switched off. For convenience, it is very nice to have the light switched on....
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This circuit is based around the PIC16LF1937 microcontroller. This chip is actually a small computer contained in a single chip, including RAM memory, EEPROM, I/O ports, CPU and so on. When you buy this chip, it comes empty with no program on it. You have to....
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This circuit is based around the PIC 16C84 (or PIC 16F84) microcontroller. This chip is actually a small computer contained in a single chip, including RAM memory, EEPROM, I/O ports, CPU and so on. When you buy this chip, it comes empty with no program on....
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This project demonstrates a number of aspects of the PIC16F687 microcontroller, like: ultra low power wake up, serial communications, nanowatt technology etc. The device can be used for different purposes. For example: measuring the content of a rain water....
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IC4 is a counter/oscillator combination and is the key element in the circuit. The oscillator outputs its AC signal on pin 7. This signal is lead (through voltage divider R3/R4) to pin 3 of IC5 (multiplexer IC) which is used as an input. The same signal is....
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Absolute-value integrator circuit gives effect of generating negative frequencies when input signal is negative by making counter count up for positive voltage and count down for negative voltage. Diode types are not criticaL-M. O. Paiva, "Applications of....
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How to built a FET Audio Mixer and Switch Circuit. PARTS LIST, R1 1MΩ, R2 47kΩ, R3 47kΩ, R4 1MΩ, R5 47kΩ, R6 47kΩ, R7 47kΩ, VR1 50kΩ, VR2 50kΩ, C1, C2, C3 4.7µF 16V, C4 100nF (104), C5 47nF (473), C6 47nF (473), Q1 BF245 or 2N3819, Q2 BF245 or 2N3819, S1, S2....
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Information for the radio broadcast and listening amateur in VERON department Nieuwegein (A29) and surroundings...
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Here is my Sputnik QSO Party transmitter prototype. The RF output power is 450mW with 70Vdc @ 14. 4mA on the V2 anode. The V2 screen (G2) current is 1. 6mA. The V1 anode current is 1. 05mA with 45Vdc @ 176uA at the screen (G2). These little vacuum tubes....
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Some months ago a surprise package turned up in my mailbox. Ananonymous donor had sent me threewonderful, old germanium transistors. The2N170 and a pair of 2N107`s (all date-coded December 1956) werestill in theiroriginal plastic tube packaging. Athin....
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The Digital Readout of the Corsair 560 is just above the tuning knob. On this particular radio these six digits bounced around, often doubling the frequency indication. The reading was so unstable, it was difficult to know what frequency the radio was tuned....
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The back to back diodes are there because some radios present high voltage transients when switching bands which will lock up the DFD requiring it to be turned off and back on to unlock. If power for the backlit display is to be taken from Vdc when AC is....
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The mid to late 1930s reflected a curious mixture of old and new thinking in aircraft radios, led by brilliant engineers in such companies as Aircraft Radio Corporation and RCA. The example below should endear itself to every radio amateur growing up in the....
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The Maya used several calendars simultaneously. One of them called the "long count", is a continuous record of days from a zero date that correlates to Aug. 13, 3114 BC, and is more According to maya`s celender when the both the wheel of the maya celender....
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The circuit as shown act as a light detector. Under normal conditions the resistance of the LDR is high, keeping pin 2 low. When light falls onto the LDR the resistance drops to a couple hundred ohms and triggers pin 2 high which biases the base of Q1 via....
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Traditionally, high quality reception of VLF natural radio signals has involved driving or hiking out to remote locations far from civilisation, in order to find an environment free of pollution by artificial radio signals. I`ve lost count of the times I`ve....
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With this project we can display 0-9 digits on the 7 segment and we can count the no of persons entering in the room. Here a counter IC 7490 is used along with BCD to 7 segment decoder IC 7447. The function of 7490 is to provide the counting value and....
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I am again here with another basic electronics projects, this time we are here to make our own regulated power supply We need a regulated supply so many times while working with electronic circuit, so we must have knowledge about regulated power supply, so....
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This H-bridge i`m using now for my Sumo-bot ( This H-bridge )I think is fairly good for medium size motors ( untill 30A peak and 13 A continuous mode). The price is arround $75 plus sending. We start talking about what is a "H-bridge". One H-bridge is a....
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When firs time found this article, i think it`s a great project using only few component. I like microcontroller project based on LED. And as you know this project very simple. I must try it. one day "I was always fascinated by the emergence of patterns. One....
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When you need connect your Microcontroller Project to COM port in PC you need RS 232 converter. There are many chip to solve the problem like MAX232, DS275 etc. But if you need simple and chep for RS 232 converter, i though this circuit will be usefull for....
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The Arduino system offers an easy and open-source method for programming microcontrollers. Normally this means using a serial cable or USB cable attached directly to the microcontroller project. But what if your project is floating in a weather balloon,....
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Here`s a small LM386-based square-wave oscillator built from the following schematic. I replaced the 30k resistor with a 50k Potentiometer from my stash of parts which then, of course, acts as a pitch controller. The following audio is some track recordings....
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i`ve been wrapped up in Jeep repair lately as there`s some sort of issue prevent the beloved XJ from firing up. i have, however, in the meantime had some time to work through my initial modulation tests on this version of the PT2399 circuit and nail down a....
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The first two are `passive` elements and op-amp is an `active` element. Also: the first two are `two-terminal` elements and the op-amp is a `three-terminal` element. Resistor has the ability to define the current that flows through it when a voltage is....
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This project is an extension of two projects - first is the work on adding an APF-type high-Q bandpass feature to the 2nd RX of the FT-2000. More on that project may be found by CLICKING HERE. And the second driver is the memory of the fun I had as a kid....
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These netbooks use ALC5632 audio codec plus mixer IC which has quite some amount of knobs and switches. Most of them are available for direct manipulation with alsamixer, GNOME Volume Control and other applications that interact with ALSA mixers. Here ALSA....
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In order to manufacture large quantities of anything, there needs to be a manufacturing system or process in place. The manufacturing process can be open loop or closed-loop. In an open-loop system, variables are controlled manually. In a closed-loop system,....
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My final project, cycling rollers, requires a method of sensing the rotational speed of one of the rollers. Typically speed sensors on cycles work by detecting the passing of a magnet attached to a spoke on one of the wheels using a Hall Effect sensor or a....
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Nowadays using programming pods are commonly accepted and widely used in manufacturing, especially when a new product is introduced and the firmware is in the early development stages. After the completion of all visual and structure tests, the board is....
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Magic Sinewave Analysis using SPICE and a Simple Inverter Circuit...
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Special tabbed-resistor geometries (improving time stability), full input protection from damage due to static discharge by diode clamps to V+ and ground, large IOUT1 and IOUT2 bus lines (improving superposition errors) are some of the features offered by....
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Communication systems using spread spectrum techniques, compare to narrow-band systems are more resistant for noises, signal fading, Doppler effect. Because of code division of signals (CDMA) we can more effective use frequency band and we can increase....
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Add to our circuit despreading spectrum 2 identical branches more. Difference is only in phase of PN sequences given to each branch (to input of double-balanced mixer). In EARLY branch, phase of PN sequence is earlier about ½ byte. In LATE branch, phase of....
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A new type of NiMH battery known as HeCell has recently been developed, which is claimed to allow higher discharge rates than the conventional ones (about 12 - 16C). ..
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This afternoon I have returned to 10m WSPR. There are lots of transatlantic reports of my signal, as well as reports of my 2W signal from Russia and Brazil. Sackville Gardens springing into bloom - Sackville Gardens is one of too few oases in Manchester city....
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This blog shows project documentations of various projects done by members of association of experimental electronics. Some projects are very easy and suitable for beginners, some are only for more advanced solderers. The core parts of this sequencer were....
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The 7490 counter is a negative edge triggered decade counter that counts from 0 to 9. Pins CLKB & QA must be connected for this counter in order that it would operate in the decade mode. The inputs R0(1, 2) & R9(1, 2) are asynchronous reset pins, one of each....
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This is a simple and effective switched mode power supply (SMPS) that I built to power a LCD monitor that I fixed a while ago. This one requires 20V at 2. 3A, but the PSU output voltage can actually be set in the range 1. 2V - 25V, with a small variable....
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For simplest functions (flashing indicator and/or beeper) you don`t need a printed circuit board, directly weld onto the legs of the PIC, an end of heat-shrinkable sleeve and that is. Go ahead with softness if you do not want to burn the integrated circuit....
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Would it be possible to remove the ESCS from a multicopter setup and replace them with a 1 single circuit board to throttle all the engines? I have a 8 motor setup wich is 8 ESCS wich is 8times the way and 8 times the possibility of failure or broken down....
This is a simple - easy to build - transistor based motorcycle alarm. It`s designed to work at 12-volts. But - if you change the relay for one with a 6-volt coil - it`ll protect your "Classic Bike". The standby current is virtually zero - so it won`t drain....
These are two - easy to build - relay-based alarms. You can use them to protect your motorcycle - but they have many more applications. If you use relays with 6-volt coils - they`ll protect your "Classic Bike". Both alarms are very small. The completed....
This FM radio-controlled anti- theft alarm can be used with any vehicle having 6- to 12-volt DC supply system. The mini VHF, FM transmitter is fitted in the vehicle at night when it is parked in the car porch or car park. The receiver unit with CXA1019, a....
It's a great convenience that most modern cars come with a built in alarm, however it is nothing but noise pollution that the horn sounds when the alarm is armed. Disconnecting the alarm system from the horn relay will eliminate this, but prevent the horn....
This paragraph Easy Car Alarm circuit with the use of fewer components, easy to produce and so on. (1) circuit automobile anti-theft alarm circuit by the time base circuit NE555, power switch VT, the switch S2, the..
Circuit works: lC1 is lock ASIC 5C058. Its 1-6 feet were even outside the key switch to the positive power supply, which is six valid key input, open lock A-F must comply with this order. 7 feet for the negative power. 8 feet false key input terminal, even....
As shown is 555 more cars with alarm circuit, mainly consists of a 555 and a quad 2-input NAND gate circuit. At the time of low oil pressure and brake pressure is too low, the ..
This is the basic fm trasmitter that I built. In theory, according to electronics, it shouldn't work but works fine and is very sensitive. It can transmit the signal up to 45 yards (about 40 meters) . A sensitive FM radio can pick up the signal up to 100....
This project is a miniature, VHF FM (wideband) Wireless Microphone transmitter of the type that are commonly refered to as BUG's. Note that "BUGS" are illegal but "Wide-Band Frequency Modulation Wireless Microphones" (WBFMWMs) are not, as so many people have....
This Mini FM Bug Detector is basically a broad-band receiver. It picks up the complete band from below 80Mhz to 150MHz and almost anything that transmits in that band will be detected. If a bug with a sensitive microphone is transmitting nearby, the result....
This is just one of the many bugging devices available on the eaves-dropping market. The range includes pen and pencil holders, trophies, framed pictures and office furniture with false bottom drawers. These products are readily sold to fledgling companies,....
The 1996 Suzuki Esteem Cooling Fan system consists of control relay for: radiator fan (located in relay box), air conditioning fan motor, radiator fan motor, condenser fan motor, junction box, fuse and relay box, engine control module. The following circuit....
Over time, many things can cause electrical problems with your Mustang. Components will get old and worn or a wire can rub against something and expose the wire to metal. I have seen where a body shop will inadvertently crimp a wire when they install a body....
This is a 12V battery checker circuit that uses 3 LEDs that light up at their respective voltages. The red LED lights up when the battery voltage is between 8 to 10V, the orange one at voltages between 10. 5V to 12V and the green one when the battery voltage....
This circuit operates with 230v. you can use this circuit to decorate your parties. I think this will be a wonderful circuit to you all. Here DIAC ER 900 and Triac BTW 11-400. ..
The circuit can be used for switching OFF a particular lamp or group of lamps in response to the varying ambient light levels. The unit once built can be used for switching OFF a lamp when dawn breaks and switching it ON when dusk sets in. The power supply....
Heat sensor circuit can be used to control any device using heat sensor. In this circuit a thermistor and a resistance is connected in series. This arrangement makes a potential divider circuit. Here the thermistor is Negative Temperature Coefficient type.....
A wonderful diy gsm jammer or cellular mobile phone jammer schematic diagram for use only in GSM1900 with frequency from 1930 MHz to 1990 MHz. The GSM1900 cellular cell phone network is made use of by USA, Canada and most of the nations in South America.....
This week was spent completing a number of different objectives. Firstly, the software was downloaded to design the schematic for the circuit to be translated onto a PCB. Much of the week was spent doing tutorials and learning the user interface to make a....
The mechanical chassis prototype, as can be seen from the image on the left, was made using two materials: foam and aluminium. Foam was chosen due to its easy manipulation and aluminium due to its excellent strength to weight ratio. The prototype includes a....
Although our kit utilizes an off-the-shelf microcontroller (AtMega328P-PU based Arduino), we additionally designed a simplified version. This allows other collaborators and students to potentially replicate, or modify the project and eventually fabricate....
LM3914 Dot Bar Display Driver LM3914 is a monolithic integrated circuit that senses analog voltage levels and drives 20 Led stereo Vu Metre Devresi PCB Circuit LM3914 10 leds stereo vumeter circuit diagram of Eagle PCB drawing of eagle ..
The 3D printer requires separate control for three independent axis. Each of the controlled axis must have a high precision electronic driver. Mechanical part of the each axis is based on a precise bipolar stepper motor connected to a drive shaft via claw....
The functional generator is a device that would have any better equipped electronic lab should have a not so frequently used gadgets, but when you need it, we certainly appreciate its convenience. Here is the procedure of the scheme, which was published in....
This is one of mine projects which can be helpful for controlling water level in water tank. I made it on one of Atarado SMART prototyping PCB for which I can tell all the best. Controller for water tank managing water pump and take care of water level. This....
The Star Delta starting method is a motor starting mechanism that minimizes the large amount of starting current that motors draw in. The Star Delta, as the name suggests basically involves feeding the motor with 1/sq. root3 (58%) of the full load current....
The circuit in this figure is protecting the circuit and the system with power supplies that may exceed safe limits. One example is small consumer products that use external ac adapters; its easy to mistakenly plug in the wrong adapter. Another example is a....
30W Class AB power amplifier circuit diagram using power transistor. Set the above amplifier up by adjust the variable resistor R1 to maximum and R12 to zero. After this set up is done, the activate / turn on the amplifier. Adjust the R1 so that the measured....
Here a single IC 556 has been incorporated for creating the PWM pulses. One half of the IC has been configured as the high frequency generator for feeding the other half IC which is rigged as a pulse width modulator. The sample modulating frequency is....
This is an IR remote control for Nikon cameras. It is compatible with the Nikon ML-L3 remote control. Supported cameras include: D40, D40X, D50, D60, D70, D70s, D80, Coolpix 8400 8800. This design is based on an idea from The circuit is extremely simple: an....
I like to see lights move to music. This project will indicate the volume level of the audio going to your speakers by lighting up LEDS. The LEDS can be any color so mix them up and really make it look good. The input of the circuit is connected to the....
This circuit generates high voltage pulses from 230vac line voltage. The drive end`s swing comparator circuit is invented by the creator of this page. The work end is derived from stroboscope trig supply circuit. All line voltage using circuits are....
Above is a schematic diagram of an LM741 light/dark sensor circuit (from the excellent 741 Op-Amp Tutorial by Tony van Roon).The ECG128/NTE128 transistor stipulated can be substituted with any NPN transistor rated at sufficient gain and current for the....
When I got the car I was relieved that it didn`t "chirp" or blare the horn every time I locked or unlocked the doors. Let`s face it, there are times when we don`t want our comings and goings announced in such a tactless manner. Still, I found that in the....
My door alarm is a small device which sounds an alarm whenever the door is opened. It is ideally used when you want privacy, if you want to know if other people enter your room while you’re in another part of the house, to wake you up if someone enters your....
When the power supply input to IC1 is the output pin 3 at a frequency of 1 kHz. The frequency is Q1 and Q2, which will continue to use push pool work interchangeably. If this is the positive output signal Q1 Q2 will run the delete function this reason, C2....
Renewable Energy Discussion on various alternative energy, renewable energy, & free energy technologies. Also any discussion about the environment, global warming, and other related topics are welcome here. I will just mention a few things in here which....
The balloon went to 103, 258 ft peak reported altitude. Many items had to be considered for launching payload to this range. Unlike building an electronics package to operate at Sea Level, items such as air pressure, temperature, relative humidity and even....
Nowadays, USBis the most popular connection connection between PC and peripherals such as AVR programmers, printers, scanners etc. For that reason I had to modify my old serial AVR In-System-Programmer (ISP) to work with USB connection. You can say, "use a....
This FM radio-controlled anti- annexation anxiety can be acclimated with any agent accepting 6- to 12-volt DC accumulation system. The mini VHF, FM transmitteris adapted in the agent at night back it is anchored in the car balustrade orcar park. The receiver....
This circuit shows a DS1236 that is used to monitor and control the power-supply and software execution of a processor-based system, and to provide a pushbutton reset. When an out-of-tolerance condition occurs (when VCC is below 4. 5 V for 10% operation, or....
The above circuit uses RS232 for interfacing with PC. It is very simple circuit & works very well with PC. Power is drawn from usb port OR needs external supply of 5V. The value of the crystal is very critical at AT89C2051 and must be 11. 0592MHz. Here....
F232 is USB powered, but you need to have a level translator at the output of F232. Tx of f232 has to be converted to RS232 levels, since the other side has a max. Receive pin can be easily opto-ed. But the transmit pin, need to have a supply in line with....
Personal Safes are revolutionary locking storage cases that open with just the touch of your finger. These products are designed as "access denial" secure storage for medications, jewelry, weapons, documents, and other valuable or potentially harmful items.....
Now-a-days every institution needs automation. As a part of college automation, we have decided to do a project Voice Interactive System for College Automation . Our project allows the user to know the student`s attendance and marks quickly through the....
This circuit uses an 87C57 microcontroller and a few peripherals to condition X-10 power-line carrier-code formats from a personal computer to use an X-10 power-line interface in a home-control system. Software details are available in the reference.....
I have designed this high voltage, low current power supply for various experiments in systems & synthetic biology. I have cleaned up the design and I am placing the schematic and board layout online below! This circuit outputs up to +1, 866VDC at under 1 mA....
If both the reading are high then the diode is short. If both the readings are Low then the diode is open. If any of read pins are low and the second is high then the diode is good. This concept can be easily extended to test a transistor by realizing that a.....png "Prology DVD-200 remote control")
I would like to thank you`s for the manual that i purchased, it is as stated, i am now able to continue with my TV to complete it. I will be using your service for all the manuals that i will need, once again thank you very much. Kind regards Lazlo Most....
The program makes use of the built-in AD converter of the PIC16F874 for sensing the touch buttons. The PIC has 8 AD ports, seven are used for the 7 touch-buttons, 1 is used for the light measurement. In order to receive DCF signals, you have to add a DCF....
This device was designed to replace the original digital clock in a Fiat Ducato 1992-1994, mounted just above the inside rearview mirror. The original clock is not very accurate, only displays time and is sensitive to interference (e. g. from Xenon....
A car courtesy light in a standard car without a board computer is often a very simple thing: you open the door, the interior light is switched on, you close the door, the light is switched off. For convenience, it is very nice to have the light switched on....
This circuit is based around the PIC16LF1937 microcontroller. This chip is actually a small computer contained in a single chip, including RAM memory, EEPROM, I/O ports, CPU and so on. When you buy this chip, it comes empty with no program on it. You have to....
This circuit is based around the PIC 16C84 (or PIC 16F84) microcontroller. This chip is actually a small computer contained in a single chip, including RAM memory, EEPROM, I/O ports, CPU and so on. When you buy this chip, it comes empty with no program on....
This project demonstrates a number of aspects of the PIC16F687 microcontroller, like: ultra low power wake up, serial communications, nanowatt technology etc. The device can be used for different purposes. For example: measuring the content of a rain water....
IC4 is a counter/oscillator combination and is the key element in the circuit. The oscillator outputs its AC signal on pin 7. This signal is lead (through voltage divider R3/R4) to pin 3 of IC5 (multiplexer IC) which is used as an input. The same signal is....
Absolute-value integrator circuit gives effect of generating negative frequencies when input signal is negative by making counter count up for positive voltage and count down for negative voltage. Diode types are not criticaL-M. O. Paiva, "Applications of....
How to built a FET Audio Mixer and Switch Circuit. PARTS LIST, R1 1MΩ, R2 47kΩ, R3 47kΩ, R4 1MΩ, R5 47kΩ, R6 47kΩ, R7 47kΩ, VR1 50kΩ, VR2 50kΩ, C1, C2, C3 4.7µF 16V, C4 100nF (104), C5 47nF (473), C6 47nF (473), Q1 BF245 or 2N3819, Q2 BF245 or 2N3819, S1, S2....
Information for the radio broadcast and listening amateur in VERON department Nieuwegein (A29) and surroundings...
Here is my Sputnik QSO Party transmitter prototype. The RF output power is 450mW with 70Vdc @ 14. 4mA on the V2 anode. The V2 screen (G2) current is 1. 6mA. The V1 anode current is 1. 05mA with 45Vdc @ 176uA at the screen (G2). These little vacuum tubes....
Some months ago a surprise package turned up in my mailbox. Ananonymous donor had sent me threewonderful, old germanium transistors. The2N170 and a pair of 2N107`s (all date-coded December 1956) werestill in theiroriginal plastic tube packaging. Athin....
The Digital Readout of the Corsair 560 is just above the tuning knob. On this particular radio these six digits bounced around, often doubling the frequency indication. The reading was so unstable, it was difficult to know what frequency the radio was tuned....
The back to back diodes are there because some radios present high voltage transients when switching bands which will lock up the DFD requiring it to be turned off and back on to unlock. If power for the backlit display is to be taken from Vdc when AC is....
The mid to late 1930s reflected a curious mixture of old and new thinking in aircraft radios, led by brilliant engineers in such companies as Aircraft Radio Corporation and RCA. The example below should endear itself to every radio amateur growing up in the....
The Maya used several calendars simultaneously. One of them called the "long count", is a continuous record of days from a zero date that correlates to Aug. 13, 3114 BC, and is more According to maya`s celender when the both the wheel of the maya celender....
The circuit as shown act as a light detector. Under normal conditions the resistance of the LDR is high, keeping pin 2 low. When light falls onto the LDR the resistance drops to a couple hundred ohms and triggers pin 2 high which biases the base of Q1 via....
Traditionally, high quality reception of VLF natural radio signals has involved driving or hiking out to remote locations far from civilisation, in order to find an environment free of pollution by artificial radio signals. I`ve lost count of the times I`ve....
With this project we can display 0-9 digits on the 7 segment and we can count the no of persons entering in the room. Here a counter IC 7490 is used along with BCD to 7 segment decoder IC 7447. The function of 7490 is to provide the counting value and....
I am again here with another basic electronics projects, this time we are here to make our own regulated power supply We need a regulated supply so many times while working with electronic circuit, so we must have knowledge about regulated power supply, so....
This H-bridge i`m using now for my Sumo-bot ( This H-bridge )I think is fairly good for medium size motors ( untill 30A peak and 13 A continuous mode). The price is arround $75 plus sending. We start talking about what is a "H-bridge". One H-bridge is a....
When firs time found this article, i think it`s a great project using only few component. I like microcontroller project based on LED. And as you know this project very simple. I must try it. one day "I was always fascinated by the emergence of patterns. One....
When you need connect your Microcontroller Project to COM port in PC you need RS 232 converter. There are many chip to solve the problem like MAX232, DS275 etc. But if you need simple and chep for RS 232 converter, i though this circuit will be usefull for....
The Arduino system offers an easy and open-source method for programming microcontrollers. Normally this means using a serial cable or USB cable attached directly to the microcontroller project. But what if your project is floating in a weather balloon,....
Here`s a small LM386-based square-wave oscillator built from the following schematic. I replaced the 30k resistor with a 50k Potentiometer from my stash of parts which then, of course, acts as a pitch controller. The following audio is some track recordings....
i`ve been wrapped up in Jeep repair lately as there`s some sort of issue prevent the beloved XJ from firing up. i have, however, in the meantime had some time to work through my initial modulation tests on this version of the PT2399 circuit and nail down a....
The first two are `passive` elements and op-amp is an `active` element. Also: the first two are `two-terminal` elements and the op-amp is a `three-terminal` element. Resistor has the ability to define the current that flows through it when a voltage is....
This project is an extension of two projects - first is the work on adding an APF-type high-Q bandpass feature to the 2nd RX of the FT-2000. More on that project may be found by CLICKING HERE. And the second driver is the memory of the fun I had as a kid....
These netbooks use ALC5632 audio codec plus mixer IC which has quite some amount of knobs and switches. Most of them are available for direct manipulation with alsamixer, GNOME Volume Control and other applications that interact with ALSA mixers. Here ALSA....
In order to manufacture large quantities of anything, there needs to be a manufacturing system or process in place. The manufacturing process can be open loop or closed-loop. In an open-loop system, variables are controlled manually. In a closed-loop system,....
My final project, cycling rollers, requires a method of sensing the rotational speed of one of the rollers. Typically speed sensors on cycles work by detecting the passing of a magnet attached to a spoke on one of the wheels using a Hall Effect sensor or a....
Nowadays using programming pods are commonly accepted and widely used in manufacturing, especially when a new product is introduced and the firmware is in the early development stages. After the completion of all visual and structure tests, the board is....
Magic Sinewave Analysis using SPICE and a Simple Inverter Circuit...
Special tabbed-resistor geometries (improving time stability), full input protection from damage due to static discharge by diode clamps to V+ and ground, large IOUT1 and IOUT2 bus lines (improving superposition errors) are some of the features offered by....
Communication systems using spread spectrum techniques, compare to narrow-band systems are more resistant for noises, signal fading, Doppler effect. Because of code division of signals (CDMA) we can more effective use frequency band and we can increase....
Add to our circuit despreading spectrum 2 identical branches more. Difference is only in phase of PN sequences given to each branch (to input of double-balanced mixer). In EARLY branch, phase of PN sequence is earlier about ½ byte. In LATE branch, phase of....
A new type of NiMH battery known as HeCell has recently been developed, which is claimed to allow higher discharge rates than the conventional ones (about 12 - 16C). ..
This afternoon I have returned to 10m WSPR. There are lots of transatlantic reports of my signal, as well as reports of my 2W signal from Russia and Brazil. Sackville Gardens springing into bloom - Sackville Gardens is one of too few oases in Manchester city....
This blog shows project documentations of various projects done by members of association of experimental electronics. Some projects are very easy and suitable for beginners, some are only for more advanced solderers. The core parts of this sequencer were....
The 7490 counter is a negative edge triggered decade counter that counts from 0 to 9. Pins CLKB & QA must be connected for this counter in order that it would operate in the decade mode. The inputs R0(1, 2) & R9(1, 2) are asynchronous reset pins, one of each....
This is a simple and effective switched mode power supply (SMPS) that I built to power a LCD monitor that I fixed a while ago. This one requires 20V at 2. 3A, but the PSU output voltage can actually be set in the range 1. 2V - 25V, with a small variable....
For simplest functions (flashing indicator and/or beeper) you don`t need a printed circuit board, directly weld onto the legs of the PIC, an end of heat-shrinkable sleeve and that is. Go ahead with softness if you do not want to burn the integrated circuit....
Would it be possible to remove the ESCS from a multicopter setup and replace them with a 1 single circuit board to throttle all the engines? I have a 8 motor setup wich is 8 ESCS wich is 8times the way and 8 times the possibility of failure or broken down....
