New Circuits Page 139
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This example shows how to design a circuit with a mixture of analog and digital parts, multiple power planes, and a single Ground plane split into analog and digital sections that have a common reference point....
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How to Mod the Servomotors (look at the pictures) Remove the four screws from the servo and take it all apart. Remove the electronics keeping only the wires from th....
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A2N3819 FET provides a solid state VOM ‚The 2N3819 acts as a cathodefollowerin a VOM The biasoffset(meter null) is obtained with R14 and R12 sets full scale calibration R2 through R9 should totalabout10 M © R10 is a protective resistor and C2 provides ac....
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An integral part of modern multimedia computer is the presence of two active audio speakers (mounted on a monitor or set next to it). Due to a number of physical limitations of the two small computer speakers can not achieve a good reproduction of the full....
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Tesla built the world`s most powerful radio transmitter. Around the base of a 200-foot mast, he placed an air-core transformer that measured 75 feet in diameter. The primary consisted only of only a few turns of wire; the secondary was 10 feet in diameter....
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I am planning on doing an s-video and rca jack mod on my Genesis. The mods I see done seem to all use the headphone jack as the source of the stereo sound. Is this the only way? I would prefer to have the output not be controlled by the volume slider. Is it....
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Here is a simple Battery Monitor circuit for a quick check of 12 volt Lead-Acid Battery. Battery charge should be constantly monitored to increase the life....
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What color LED it makes a difference. One LED or how many 3mm 5mm What is you power source These are vital things to answer. More info required. It does not compute! There`s them that knows and them that just thinks they know, whitch are you Stir the pot and....
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The most popular is MED-NET, which covers all the mediterranean sea with its observation points. The shown map shows the observation points in the mediterranean sea. For further information about this net being part of the Italian Geophysical National....
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This article includes an assembly language listing that requires MAC/65 or Atari Assembler Editor. You will also need access to an EPROM burner. The three earlier installments ran in the January, February and March 1985 issues of Antic. This USART design is....
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The following circuit shows about LM1800 IC Integrated FM Stereo Demodulator Circuit. Features:excellent sound quality, high quality FM stereo, ....
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Introduction It`s time for 8-pin microcontroller Microchip PIC12C508, the SAVER V3.2, my latest design of a device that turns a night light on and off ever....
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There are not many AM transmitters that are easier to build than this one because the inductor is not tapped and has a single winding. There is no need to wind the inductor as it is a readily available RF choke (eg, Jaycar Cat LF-1536). To make the circuit....
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This includes immunity to power line transients as well as those that may occur during power-on and power-off cycling. The parameters of many electronic components like ICs are rarely specified during periods of changing input power. Special laser diode....
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The circuit given here is of a three input mic mixer cum preamplifier using the IC LM348. The LM348 is a high gain, internally compensated quad operational amplifier with a class AB output stage. The IC has very low input supply current drain (0. 6mA/ opamp)....
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Switch mode/switching voltage regulator with TL497 integrated circuit, up to 75% efficiency, output: 5V, input: 7.5-15V...
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The temperature of a quartz crystal for oscillator should to be kept constant to operate at very stable frequency. This oven temperature controller is suitable...
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In the circuit, 60 individual LEDs are used to indicate the minutes of a clock and 12 LEDs indicate hours. The power supply and time base circuitry is the same as described in the 28 LED clock circuit above. The minutes section of the clock is comprised of....
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Here the SW transmitter circuit based on IC BEL1895. This particular transmitter circuit works in shortwave HF band (6 MHz to 15 MHz), and can be applied for shortrange communication and for educational purposes. The circuit is composed of a mic amplifier....
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This is also remote controlled land rover but as a remote control one can use his cell phone. That means he can move the land rover by sending different commands from his cell phone. Not only that, he can control it from anywhere in the world (of course....
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Valves are enjoying increasing popularity in audio systems. With the European E` series of valves, such as the ECC83 (12AX7) and EL84 (6BQ5), the filament voltage is 6. 3 V. Depending on how the circuit is wired, the ECC 81 83 series of twin triodes can also....
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The input transistor Q2 is an N-channel JFET. Each particular JFET sets a particular output bias voltage, so the JFET must be selected from among multiple devices for the desired bias value. Fortunately, due to the low current involved, desirable devices can....
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This is an improved IR remote control extender circuit. It has high noise immunity, is resistant to ambient and reflected light and has an increased range from remote control to the extender circuit of about 7 meters. It should work with any domestic....
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This lab will demonstrate the theory and operation of non-inverting amplifiers as well as their practical application to amplify the signal of a microphone. We will construct a non-inverting amplifier to increase the output signal of a microphone, and use....
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In this fire alarm circuit, a Thermistor works as the heat sensor. When temperature increases, its resistance decreases, and vice versa. At normal temperature, the resistance of the Thermistor (TH1) is approximately kilo-ohms, which reduces to a few ohms as....
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The bar graph - a series of LEDs in a line, such as you see on an audio display - is a common hardware display for analog sensors. It`s made up of a series of LEDs in a row, an analog input like a potentiometer, and a little code in between. You can buy....
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IC LM4651 and LM4652 is a type of MOSFET ICs and power amplifiers include high-efficiency amplifier, suitable for self-powered speakers, a subwoofer and driver quality car. LM 4651 is a fully integrated conventional pulse width modulation (PWM) driver,....
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ICs has been used in many audio amplifiers, especially small circuit. It is convenient to use transistors. But when you need to use transistors, it has several advantages, such as saving you can take old equipment come to made small circuits easier than the....
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Here is a very simple, inexpensive and interesting project which provides lot of fun to a home experimenter or hobbyist. This simple transmitter can transmit speech over a short range. It can be used as a simple cordless microphone. The circuit uses two....
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This wideband jammer simultaneously blocks all transmissions within a desired band typically by sweeping across the desired band to be blocked, starting at the lowest frequency and ending at the highest frequency of the band. For this purpose a linear....
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This is a design for power supply circuit. This circuit can produce source voltage 5V. This circuit is built by TTL IC`s. But this design is simple design. This is the figure of the circuit. For circuits using TTL ICs the supply voltage is a great concern....
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You cannot use a multimeter to check a crystal. You should have a this circuit, because it can check a crystal 100Khz to 900Mhz, easily to make and cheap.The....
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Useful for liquids level detection and proximity devices, Up to 50 cm. range, optional relay operation This circuit is useful in liquids level or proximit....
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To charge lead-acid batteries we can use this circuit that consist of a current-limited power supply and a flyback converter topology. Here is the schematic....
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The hobby circuit below uses an unusual method to generate about 12, 000 volts with about 5uA of current. Two SCRs form two pulse generator circuits. The two SCRs discharge a 0. 047uF a 400v capacitor through a xenon lamp trigger coil at 120 times a second.....
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High frequency waveform generator is very useful in electronic experiment and design. This circuit generate sine wave oscillation, but actually we can modify the circuit to generate triangle or square wave function. The frequency can be controlled using....
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This works in a way that the phone line won`t stay busy while the LEDs are connected and when you pick up the phone, the light goes off and allow you to use your phone normally. hello. u sadi that ur phone delivers 48 v DC n when phone rings, it delivers 96....
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LM134 makes a good temperature sensor because it has a highly linear output characteristic. Because it is a current output device and is therefore not affected....
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The values of LM56 Thermostat project Circuit diagram of R1, R2 and R3 for the points of travel, VT1 and VT2 can be determined using the subsequent equations. This thermostat of electronic circuit with IC LM56 diagram what simple project, you can use as....
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Timer for Charger Circuit Diagram. This timer circuit helps to keep the battery in top condition through automatic charging for 5 to 6 hours daily so that the instrument can be left unattended ..
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This project replaces the electronics in a standard quartz wall clock with a circuit that uses GPS satellites to get the precise time....
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This circuit will be particularly useful to those hobbyists who use a breadboard` to try out ideas and who also use a simple home-made` DC power supply consisting of a transformer, rectifier, smoothing capacitor and protective fuse, that is, one without over....
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The 100W4 is a two tube medium frequency transmitter with provision for pre-tuning to three frequencies in MF band and for type A1, A2 and A3 emission. For type A1 the two tubes operate as parallel oscillators and for A2 and A3, looking at the set from the....
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Nowadays, just about every house has an outside lamp with a motion sensor. Such a device eliminates the need to feel your way to the front door, and it ap....
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Circuit Hello HELLO! Are you deaf Do you have disco ears ` If people ask you this and you`re still well below 80, you may be suffering from hearing loss, which can come from (prolonged) listening to very loud music. You won`t notice how bad it is until it`s....
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The following two-transistor circuit is a pre-amplifier circuit for magnetic phono cartridge, which is characterized by its frequency response defined by RIAA standard for phono recording. This pre amp circuit has gain around 40 dB (midband) at 1 kHz. Here....
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Converting my 1958 Buick over to electric wipers with delay and automatic "wipe on wash" functionality, and in the process I`m trying to figure out how to integrate the new electricals with the entirely non-electric original wiper controls so the driver....
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This Digital Dice electronic project uses a combination of 555 timer, 7490 decade counter, 7483 4-bit binary adder, 7447 BCD to 7 Segment Decoder and the 7 segment display the digit ..
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Abstract This Application Note describes PSoC device implementation of a BLDC (Brushless DC) windscreen wiper Motor Controller for automotive applications. LIN Bus 2. 0 is implemented to provide an Interface for controlling wiper operation. This Application....
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This circuit utilising a 555 timer IC can be used as an alarm system to prevent the theft of your luggage, burglars breaking into your house etc. The alarms goes ON when a thin wire, usually as thin as a hair is broken. The circuit is straightforward. It....
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The input capacitor is for the low frequency cut-off and the standard value for the input capacitors is 0. 1uF ( the cut-off for this value is amount to 16Hz). ..
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This one is using a 16F876 PIC, MCP1047A temperature sensor ( X2 ), MCP1541 voltage reference and MCP6022A opamp. The display is a 2 row HD74780 based 2X16 char, SII L1652BIJ2 but any other display based on HD74780 can be used. Meantime the thermometer is....
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IC1 is a dual operational amplifier. In this circuit each op-amp is used simply as a voltage comparator. When the voltage at the + input is higher than the voltage at the - input, the output goes high. When the voltage at the + input is lower than the....
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Article about full automatic 6V 4.5AH battery charger circuit with schematic using IC LM317T and few components. The circuit can charge 6V lead acid battery. ....
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The purpose of this circuit is to animate shop-windows by means of a capacitive sensor placed behind a post-card-like banner. The card is placed against the glass inside the shop-window, and the visitor can activate the relay placing his hand on the card,....
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The printed circuit board, has a pin strips (10 pin x 2) used to connect with the circuit board of the remote control device. The pin 1 (ON/OFF) is used by a microcontroller to turn the GSM module on and off. The module is turned on or off according to the....
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TDA7000 is a famous FM radio receiver IC also called one chip FM radio receiver covers VHF FM band from 70 to 120 MHZ. This IC was first introduced in 1980`s and gained very popularity in the electronics world and it is still very popular after 31 years. The....
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This simple Batteries charger circuit is designed for NiMH/NiCd batteries. It need no micro-controller nor any programming. Linear Technology Corporation...
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A simple technique for measuring frequencies over quite a wide frequency range and with acceptable accuracy limits using a PC. It follows the basic technique of measuring low frequencies, i. e. at low frequency, period is measured for a complete wave and....
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How to make a combined / dual serial and USB cable for the Nikon Coolpix 990 (e990) camera...
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This fridge door alarm is using a 3V battery supply should be placed (in a small box) in the fridge near the lamp or close to the opening. With the door cl....
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This circuit shows about 4060IC For Timed Beeper Electronic Circuit Diagram. Features: suitable for table games requiring a fixed time to answer a ....
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I am presenting one application with the Nokia 3310 LCD: Designing a thermometer using DS1621 temperature sensor IC. DS1621 is 8-pin sensor from Maxim, with...
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This is a simple circuit diagram of 5-LED audio VU meter using IC KA2284/KA2285. The KA2284, KA2285 are monolithic integrated circuit. It is a logarithmic display driver IC. And it is Bar type display driver using 5-Dot LED. The KA2284/KA2285 has a wide....
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An oscillator is a circuit that can generate a frequency source such as a sine wave, square wave or pulse train. An oscillator is fundamentally a combination of a frequency-sensitive circuit such as an LC circuit or a crystal and a negative resistance....
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There is certainly only one variable resistance in this circuit diagram which is made use of to adjust frequency of 240V AC output current. It is best to have a frequency meter to adjust this frequency of 50HZ to 60HZ as per your requirement. Please don`t....
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This article explains the construction and working of feedback oscillators with detailed description of Wien`s bridge oscillator and phase shift oscillator along with their circuit diagram, basic components and practical application Oscillators are those....
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To obtain such a monitor it`s enough to connect a resistor in series with the bulb and connect at a main outlet. The resistance of that resistor may vary on the type of bulb and the main voltage but it`s not critical: about 150K © for 220. 230Vac and about....
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This index is arranged alphabetically on each word (except prepositions). For example, the "Frost Alarm" will be indexed under "A" and also "F". To quickly find a circuit use the top index or try your browsers search function. In Firefox, Konqueror, Opera....
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A high quality stereo amplifier circuit of 44 Watts (22 Watts per channel) using TDA 1554 IC. This is a powerful audio amplifier circuit for 2 channels....
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The schematic for this project is not terribly complex, however it is very important that you understand the circuit board and how it operates because of the high voltages that are generated. Below is a `rough draft` schematic of the camera used for this....
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The power supply was built into the base of the mic which can lead to hum issues despite the on-board potentiometer that acts as a `null`. This also means that the mic has two cables running from it - one for power and one for audio. Both mics use two-stage....
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This audio peak detector allows a pair of stereo channels to be monitored on a single LED. Identical circuitry is used in the left and right channels. Use....
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Here is a very simple circuit that can be used to check the hfe of transistors. Both PNP and NPN transistors can be checked using this circuit. Hfe as high as 1000 can be measured by using this circuit. The circuit is based on two constant current sources....
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This circuit uses a very simple approach to detecting smoke in the air. Quite simply, it uses a bulb as a light source, and an LDR (Light Dependent Resistor) as a light detector. As fire smoke comes between the bulb and LDR, the resistance of the LDR....
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A lot of electronic circuits using NE555 timer IC Here is the circuit diagram of a police siren based on NE55 timer IC. The circuit uses two NE555 timers ICs and every of them are wired as astable multivibrators. The circuit will be powered from something....
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Nowadays, USB is 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 Circuit can be used to jam FM radios in its vicinity. This is a classic single transistor oscillator operating in the VHF region. Working principle of the circuit is very simple and straight forward. Powerful VHF oscillations from the circuit will....
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This circuit is designed to check the condition of lead-acid and gel cell batteries with capacities greater than 20Ah. It switches a load of about 18A at a rate close to 50Hz so that the internal resistance of the battery can be measured using a digital....
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Achieves high carrier and modulation suppression by using closely matched diodes and providing R1 for amplitude adjustment and coaxial line for phase adjustment. R2 provides slight amplitude adjustment. -W. H. Ellis, Diode Quad Modulator Suppresses Carrier....