New Circuits Page 40
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A simple passive (no power required) circuit to match an antenna to a radio receiver. This will be a useful addition to the short wave listener, but in addition a medium wave coil is almost used to tune the medium wave band. An aerial tuning unit (A. T. U. )....
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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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A very simple but very good amplifier unit, with low distortion. A similar modification was used as a preamplifier HAFLER. The quality however of the reproduced sound in all the symmetrical amplifiers regardless of the cost of the necessary materials,....
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A wireless interface for your next project Got some wire With a coil, a cap and a transistor, you can make your next project emulate a Radio Frequency Identification Device (RFID), commonly called a "tag" or an "RFID tag. " Here`s how. A device usually....
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To complement the 60 Watt MosFet Audio Amplifier a High Quality Preamplifier design was necessary. A discrete components topology, using + and - 24V supply rails was chosen, keeping the transistor count to the minimum, but still allowing low noise, very low....
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A very simple proximity detector electronic project can be designed using this schematic circuit. This proximity detector electronic project use a tone decoder integrated circuit ( NE567 ) that will provides a signal with a frequency about 100Khz. When an....
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Hi I am testing wein bridge oscillator and I looking to make it work. I have study the page below, but there are some concept i do not understand....
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Adrian Bontenbal has provided us with updated notes from his experiments in building a re-creation of Clara Rockmore`s theremin. As you`ll recall, Bob Moog shared his hand-drawn schematic for Clara`s instrument over a decade ago. Adrian started with that....
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Resistor between pin 10 and 11 is a 100K Ohm one, the other a 2K. Fixed capacitor was by trial and error, to get crystal on the exact frequency, somewhere near 39pF and the variable one a little more: 39+20var, see 4060 datasheet. The output circuit on the....
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The frequency jammer works by creating interfering RF noise, centered around the 2. 45 GHz carrier. As the power associated with the noise increases, the signal to noise ratio for the wireless communication channel decreases. This increases the bit error....
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Hi again, I have a simple audio switching circuit that is giving me a problem. I am using a CD40106 Schmitt Trigger in conjunction with a CD4066 CMOS switch to route....
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This is a universal version of the Four-Digit Alarm Keypad. I`ve modified the design of the output section - to free up the relay contacts. This allows the circuit to operate as a general-purpose switch. I used a SPCO/SPDT relay - but you can use a....
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The common home solar power system, in principle consists of a roof-mounted solar panel, a charge controller and a storage battery bank plus direct or elec....
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The receiver is a basic SA612 circuit. (U5 and U6) The LO for 20 meters is about 9 MHz and an IF of 5.068 MHz. The IF filter uses two crystals and has a peak response at about 5.070 MHz, so this matches up well with the 20 M PSK sub-band centered at about....
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It is high performance DAC with oversampling, delta-sigma architecture and maximum sample frequency 192kHz/24bit. It has balanced voltage output. It is connected to high-quality operational amplifier which has low-pass filter function and buffer with....
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The 15 w class B audio amplifier circuit shown here is a simple class B audio amplifier based on TL082 op amp, TIP41 and TIP42 transistors. LM833 is a dual amplifier with high scanning speed and low distortion designed specifically for audio applications.....
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My first tasks involved buying some VHF parts + exploring the Butler crystal oscillator. Specifically, I`ll cover my experiences with the common base version of the Butler oscillator. Like HF, the VHF knowledge base contains ever-present lore. Consider the....
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One 1381 part (CMOS voltage-controlled trigger available at different limits) Get one that matches the voltage across your motor (2V in this case) 8. The other terminal of the motor is connected to the 3300uf capacitor which is in turn connected to the other....
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This is my first post and I`m desperate. I bought a used model# 110-2079 gap bed 18 speed lathe with an American motor on it. I didn`t realize....
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This logic probe can be selected to operate on TTL or CMOS logic levels, depending on switch S1. A string of resistors associated with switch S1 sets the threshold levels for a window comparator comprising IC1a and IC1b. Depending on whether the level....
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Tthe circuit has enjoyed popularity as a standalone booster and as a building block in larger circuits. While the circuit has its merits, we decided to further explore it to determine if it was a truly faithful solid-state version of the familiar input stage....
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There is an advantage in using continuously active PWM signals. The main reason is that the asynchronous frequencies of the PWM core and microcore can sometimes result in a forshortened PWM pulse. The Sevo reconizes this as a command for a new positions and....
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The following circuit shows about AM Broadcast Detector Circuit Diagram. Features: with 10KHz notch filter, fits well with a low voltage single ....
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Signal clipping is usually avoided in most application, but we can find some useful examples where clipping is intentionally employed in audio processing. One ...
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Infrared light reflected off a finger is used to activate this switch circuit..
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The most glaring ommision was that the DRUID did not accept confirm codes (ie the solution to the clue) and did not give directions to the next cluesite. Instead teams had to call in and confirm with Game Control in order to find out their next destination.....
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This is a circuit of phone message flasher, an alternative way to get alarmed when there is an incoming call. When the phone rings, high line voltage will be....
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The RF signal is split into two signals that are shifted 90 degrees out of phase (one plus 45 and one minus 45 degrees). Both are mixed to audio frequencies. The two audio signals are again shifted 90 degrees out of phase (again one plus 45 and one minus 45....
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The aim of this design is to reproduce a Combo amplifier of the type very common in the `sixties and the `seventies of the past century. It is well suited as a guitar amplifier but it will do a good job with any kind of electronic musical instrument or....
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Unique applications of 567 tone/frequency decoder IC? Here is one of them: pulse generator with 25% duty cycle (active factor). This signal generator produce ...
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A microcontroller is a single-chip computer. It has internal RAM, ROM, timers, counters, interrupt circuitry, I/O ports, analog comparators, serial USARTs, analog to digital converters, watchdog timers, and a RISC architecture. When you are using a....
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This schematic example (see sine2square. png ) demonstrates a sinusoidal voltage input at a frequency of 10KHz converted to a square wave through an inverter-based circuit. VDD and VSS rails are ties to +1V and =1V, respectively. The control file (....
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The brief with this project was to produce cost effective electronics that could be assembled by a small, informal PCB manufacturing plant based in India, repaired easily, and producible with the minimum of setup. We used "jellybean" (common/generic/low....
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A thyristor is like a diode; it can pass electricity in a forward direction but, blocks it in a reverse direction. The difference between a diode and a thyristor is that the thyristor is a three terminal device consisting of an anode, cathode and gate, which....
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This light chaser circuit (music-operated lighting effect generator) comprises five sets of 60W bulbs that are arranged in zig-zag fashion. The bulb sets g....
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The 32-kHz low-power clock oscillator offers numerous advantages over conventional oscillator circuits based on a CMOS inverter. Such inverter circuits present problems, for example, supply currents fluctuate widely over a 3V to 6V supply range, while....
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This low-power NTSC video and sound transmitter is useful for amateur radio, video handle-talkie, R/C and surveillance pur-poses. A crystal oscillator-multip lier RI` power amplifier. Video modulation is via a three-transistor series modulator. The sound....
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the gate terminals sensitivity to changes in voltage. The gate terminal here is left open circuit, connected only to the "probe" this being just a few inches of bare copper wire. With no fixed DC biasing, the gate terminal will respond to micro changes in....
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If you are making a stereo amplifier, or if you own one already, then do not hesitate to add this circuit. The entire circuit is wired around IC4017 whose clock input is tapped through transistor BC107. Basically, IC 4017 is a 1-of-10 decade counter or a....
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Working, schematic diagram and design of uA741 IC op-amp comparator circuit with inverting, non-inverting comparator waveform is provided....
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If you`re just building a dual stand-alone preamplifier (as for, say, a stereo magnetic phono preamp), your power supply requirements will of course be greatly reduced. Figure 5A shows a simple supply using readily-available 12 volt, 1/2 ampere transformers....
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Shield for Arduino designed and based on the module GSM/GPRS SIM900 or the GSM/GPRS & GPS module SIM908, to make calls, voice and data connections via GPRS. We begin with the supply circuit a simple LM7805. To work, it is necessary to provide an input....
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The so-called regenerative effect of a 4-quadrant inverter. Yup you will need to dissipate that power somewhere. In big industrial drives this gets re-inverted onto the national grib, but hear I would suggest a braking cct. For low-power stuff (1W-5W) they....
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Using any camera in a dull or dark environment generally requires the use of supplementary light. This is a standard technique, and even where adequate natural lighting exists, to take conventional film pictures with enhanced contrast using a fill-in` flash....
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Light sensitive switch or dark sensitive switch is a special type of switch using op-amp IC LM74 and LDR circuit diagram with description ...
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An edge combiner comprising MOSFETs C and D has to generate a 16ps pulse. Centre frequency as a function of NMOS width Wser over inverter width Winv. Figure 12. Illustration of transmitted, reflected, dissipated and leaked signals of a switch in the (a) ON....
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Vehicle Anti-Hijack Alarm No3 this circuit was designed primarily for the situation where a hijacker forces the driver from the vehicle. If a door is opened while the ignition is switched on - the circuit will trip. After a few....
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Multipurpose Circuit for telephone. This add-on device for telephones can be connected in parallel to the telephone instrument. The circuit provides audio-visual indication of on-hook,...
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I bring you wiring diagram of PCs power supply of DTK company. This power supply has ATX design and 200W performance. I was drawed diagram, when I repaired this power supply. This power supply circuit uses chip TL494. Similar circuit is used in the most....
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The schematic for controlling the motors is split up into three main parts, with each part having a unique functionality. The main parts used and seen in the schematic below are the 18F252, SN754410 and 2N2222 Transistors. Seen at the very top, the....
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This is the circuit diagram of audio/video modulator. The circuit will convert an audio and video signal into a UHF TV signal. It`s desired to connect a video signal originating from a camera or other video source to a normal TV set. The audio and video....
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Used for proximity detection and touch-controlled switching. for example, a finger comes close to the sensor, it creates a capacitance to Earth with a value of 30 to 100 pF. Component: Resistor, Capacitor, Diode, LM339D IC..
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The drive circuits for Unipolar stepper motors are usually very simple. In its simplest form, a transistor or MOSFET is used to drive each section of the windings. With this design, the control signal must be supplied programmatically to the four windings of....
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The SheevaPlug is reputed to have a marginal power supply. It seems to be more of an issue for the people in the UK running at 240VAC, and it also seems to be a problem to load the USB too heavily, as happens if you want to add an external mechanical disk....
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The circuit consist of 10 k and 470 k resistors. Also one potentiometer resistor and led was used. This circuit is used for learning Arduino programming later in class...
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As the only electronics engineer in my family and circle of friends, it is sometimes not possible to evade an appeal for help. This time the request came from a friendly elderly lady in a retirement home. In her room the light switch by the door and the pull....
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In the voltage to time conversion section, the analog input voltage is fed to the attenuation circuit. The attenuated signal is compared with the the ramp signal generated by the ramp generator given in the block diagram by the input comparator `C1`.....
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It uses the simpler method of direct frequency measurement which is easy to do but means that the number of digits displayed depends on the input frequency. If you want to display all digits all the time there is a technique called reciprocal counting- but....
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Burr-Brown DRV134 AUDIO BALANCED LINE Receiver schematic PCB/Kit anybody? I want to make a Balanced Line RECEIVER using the DRV134. Could anybody....
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Here is the circuit diagram of IC Controlled Emergancy Light With Charger or simply 12V to 220V AC inverter circuit. The circuit shown here is that of the IC controlled emergency light. Its main features are: automatic switching-on of the light on mains....
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No matter what kind it is, passive human body infrared sensor circuits are almost the same with the above, maybe some has less stages. This circuit in the figure is got from the NICERA producer, which is classical. The stage of front-end is the low frequency....
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The acronym FACTS stands for “flexible ac transmission systems.â€These systems add some of the virtues of DC, i.e., phase independence and fast...
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The circuit was designed to create an electronic oscillator known as Wien Bridge Oscillator which can be used for the creation of low frequency sine wave...
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Is the battery empty, or is there something wrong with the device? That s always a difficult question when your walkman or some other battery-powered device appears to be dead when you switch it on. Before you take it to the shop for servicing, the first....
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This is the circuit diagram a powerful LED flasher. High power LEDs are very common in the market now and a 1W high power LED is used here. Transistors Q1 and Q2 are wired as an oscillator which produces positive pulses of width 20ms @ ½ Hz. Transistor Q3....
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Simple few transistors generator and transformer A transforms 1. 5V battery voltage to few hundred of volts. This is quite high voltage. Then this high-voltage current passes through a diode, which rectifies current to DC. This DC current is stored in quite....
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The clock pulses from the555 astable circuit is sent into the 4017 decade counter. Each output becomes high in turn as the clock pulses are received. Appropriate outputsare combined with diodes to supply the amber and green LEDs...
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The nitrogen (N2) laser produces intense extremely short (a few ns) intense (100 kW typical) pulses of light in the near UV portion of the E/M spectrum (337. 1 nm). Despite this impressive capability, the N2 laser is among the easiest to construct for the....
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magnetic stripe reader, electric circuit theory, logic operation: Your wiring diagram does not connect the transistor in the circuit. The collector pin of the transistor connects to the tip pin of the Jack. The base pin of the transistor connect to the....
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The water sensor circuit is based on a 555 timer circuit and come common electronic components. The water sensor is made by two metal electrodes arranged very close that a drop of water (liquid) will bridge them. If the liquid ( water ) is very pure you may....
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This a application circuit for calibration. This circuit is called high voltage AC calibrator circuit. In another dimension in sine wave oscillator design is stable control of amplitude. This is the figure of the circuit. In this circuit, not only is the....
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I would like to build a board that has 1 - 120volt/600Watt input and > 3 - 120volt/200Watt outputs. The outputs we shall call A, B ....
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The 74ALS996 part is shown which corresponds to the commercial temperature range, but the 54ALS996 may also be available which would operate up to the military temperature range. Although these parts are always available in the same packages, as the ALS....
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One of the most popular electronic IC number. There are many different symbols depending on the firm and ability to meet such as 74HC47, 74HCT47, 74LS47, . This is a sign dedicated decoder IC for LED 7-segment common anode. Application when it needs to....
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This document describes how to read a capacitive humidity sensor directly from a micro controller using 1 resistor, 1 diode the sensor and two IO lines. It does this without an ADC by measuring the amount of time it requires to charge the capacitor through a....
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Miniature vacuum tubes with cathodes of high-field-emitting carbon nanotubes are currently under study at Agere Systems in Murray Hill, NJ. A triode with amplification factor of 4 has been constructed, with an anode-cathode spacing of 220 µm, and a pentode....
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The CS4811 is a complete Audio effects processing system on a chip. This device integrates a proprietary 24- bit Audio processing engine, large on-chip RAM Memories and a high performance 24-bit Audio CODEC A serial control port allows the device to boot....
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This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. There is no volume control, audio levels being directly controlled from the sound card itself. Construction is straight forward and is....
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Here is the circuit for VGA to scart connection. It is basically a circuit which takes VGA signals and converts it to RGB + composite sync signal which can be fed to TV via SCART connector. VGA card picture components RED, GREEN and BLUE are already at the....
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Originally Posted by Pano Like putting milk and sugar in your coffee. Next time by, your Turkish coffee comes with no sugar dave....
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Circuit This schematic is the power supply and front-end sections of the field monitor that is discussed in more detail at Electric Field Disturbance Monitor. (this link is off-site) The system can detect human and animal motion by the electric fields they....