Popular Circuits Page 103
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FIG sensitive ((InW) .OPA111 optical receiver amplifier feedback resistor of FIG 200Mn, because the gain of the amplifier is high .OPAI11 receiving signals transmitted over an ..
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The CD4060 is a CMOS 14-stage binary counter with an internal oscillator on chip. The oscillator is controlled by the resistors and capacitor tied to the timing pins, 9-11. This oscillator runs the binary counter, and the various outputs count at the....
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This alarm is designed to sound its Siren only once. That is - when the alarm is activated - the Siren will sound for a preset length of time. Then it will switch off and remain off. The alarm will not re-activate. The basic circuit has a single zone with....
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The discussed automatic change over relay circuit was requested by Mr. Karimulla Baig. The circuit normally charges the connected battery at constant current through the power received from the solar panel, andrevertsto DC power from an AC/DC adapter in the....
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The decoder is intended to be a reference quality prototype with maximum flexibility for experimental use with different speaker layouts. A new improved version has been added at the end. There are two main sections to the instrument. The UHJ decoder board,....
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If you need a timer circuit, we go after the most proven 555th However, if the delays are longer, based on timing capacitor capacity is too large. In this case, a circuit of Figure 1 After pressing the button - reset circuit - starts multivibrator. ..
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Hello friends I have a problem in a PLL. I have used a loop filter as shown in this figure: But the output spectrum is as shown in this figure: What`s ....
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I recently uncovered this schematic, that seems to be authentic and does not feature the 555 timer. Additionally if you check out the picture of Brian Davis on this page you can see him holding up the etch mask I don`t see anything that looks like a socket....
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Most of the PC desk lamps available in the market light up whenever there is an input power. These don`t take into account whether there is a real need for....
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The circuitry for the tone detector, solenoid driver, and motor speed control (paper transport and spindle) is rather straightforward. A solid-state implementation of the driver circuit typically needs a diode (installed with reversed polarity) across the....
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1C foot VIII made a number of training device, from the trigger terminal CI. f-off positive input pulse. End by supporting a n quotient output level. Lose. commercial electric ..
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Figure shows the circuit diagram of multi tone alarm. This is basically an amplifier circuit. The central part of this circuit is the dual...
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This is a simple digital counter of pulses with 7-segment LED displays. There may be any number of digits. I have chosen decimal counters 4026 (MH4026, HCF4026, CD4026, etc. ). Their advantage is that you don`t need binary decoders from BCD to 7-segment....
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The unknown resistance is put in series with a known standard and a current passed through the pair. The voltage developed across the unknown is applied to the input and the voltage across the known resistor applied to the reference input..
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Circuit works (only the relevant parts of the manual draw mode): Figure a shows a circuit schematic circuit; Fig. B Typical electricity as conventional secondary circuit road; ..
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Get my head around the headlight wiring in my car, and I`m curious what purpose the two diodes in this diagram serve. Hoping one of the clever people on here can explain it for me: Wow - thanks for editing my post and the very quick replies. Fantastic. I....
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Originally Posted by ide2003 Hi intensate, I`ve been in your shoes before. If you want no op-amp all together I highly recommends you to have ECDesign`....
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To measure the input impedance of an unknown circuit first set the signal genaerator to a current source of magnitude 1 amp. You also need a shunt resistor of 100 Meg. This setup is useful for measuring amplifiers, filter and oscillator circuits. Use the....
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When feed power supply reach the circuit and feed input signal come in. The sound signal change C1 and R1 for signal coupling and eradicate noise oscillator go out. From that time go to reach input pin 3 non inverting of IC1. Which be op-amp IC boost up....
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The siren circuit is what importance in various alarm. For example : the emergency alert, burglar alarm circuits, Fire alarm circuits, Timer, sensor controls, etc. If we have not these circuit, We will not able to recognize the functionality of the circuit,....
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Don`t forget to seal your wire splices with heat shrink. It adds tensile strength to wires, is flameretardant and protects them from fraying. Heat shrink tubing forms a protective, insulated, water-resistant covering over wiring splices, crimp terminals and....
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The Atmel AVR series are very good microcontrollers with quite a rich instruction set, rich enough that lots of folks have good compilers for them so we don`t have to learn their assembler. A very rich compiler available is the BASCOM/AVR compiler from MCS....
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The circuit is basically a radio frequency (RF) oscillator that operates around 100 MHz. Audio picked up and amplified by the electret microphone is fed into the audio amplifier stage built around the first transistor. Output from the collector is fed into....
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Almost all 24V power systems in trucks, 4WDs, RVs, boats, etc, employ two series-connected 12V lead-acid batteries. The charging system can only maintain the sum of the individual battery voltages. If one battery is failing, this circuit will light a LED.....
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This is a design for simple circuit of the tilt sensor alarm presented here can be fabricated using readily available inexpensive components. The circuit is a true transistor based design. Home made Tilt sensor for this circuit is an ordinary little....
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This is design for charger circuit that is suitable for lead-acid battery, including flooded, gel, and AGM types. This circuit is simple design. This is the figure of the circuit. The automatic term means that this charger will stop charging automatically....
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A small amplifier with nice characteristics: Tendency of catering: 15V. Force of expense: 4,2Wrms in the 4W. Minimal signal of entry: 94mVp-p with preamplifier, 0,65Vp-p without the preamplifier...
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By using Fujitsu (Japan) "IR-Commander" or "Crossam2+ ( Japan ) ", you get high reliability computerized home control environment. IR Commander is a multi-function adapter that supported IrDA / ASK / 24 feet 360 degree TV-Remote. Crossam2+ is the remotes....
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Crystal is a one-way ordinary transistor triggered threatened tube dimmer light circuit, VT2, V hired composition complementary amplifier to form the thyristor VT1 trigger circ..
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The copper chloride (CuCl) and copper bromide (CuBr) lasers are variations of the copper vapor laser. The Cu vapor laser runs at a high temperature of around 1, 100 °C and is driven with a high voltage pulse, usually at a repetition rate of 8 to 10 kHz. Its....
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This is the circuit of a 500 watt linear amplifier, based upon a design by Frits Geerligs, PA0FRI, who has his own homepage at http://home.planet.nl/~fhvgeerligs. The circuit uses four PL519 TV line output valves in a very simple circuit that will deliver....
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In this small switching power supply, a Schmitt trigger oscillator is used to drive a switching transistor that supplies current to a small inductor. Energy is stored in the inductor while the transistor is on, and released into the load circuit when the....
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The camera and shutter control are completely self contained and can be used in any situation where you would like to take a number of photos automatically at a set interval in time. In this case it is for Kite Aerial Photography, but I have used this camera....
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Ql is a phototransistor that is normally illuminated by a beam of light. When the beam is intercoupled, pin ..
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A simple burglar alarm circuit diagram and schematic. This can be used as anti theft alarm by attaching the burglar alarm circuit to window foil....
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It consists essentially of three stages and gives the antenna a power of 300 WATT, provided it is properly tuned. The first tier is an oscillator that has an oscillating coil L1 that will be required by the market as a 6SA7 coil. The coils L2 and L3 consist....
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By phone automatically when the lamp base circuit NE555 and optocouplers constituted a call at night, light will automatically light up, hang up delay imi. About, self-extingui..
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This is a simple type remote control by using RF communication without microcontroller. In this project a remote has been designed for various home appliances like television, fan, lights, etc. It gives lot of comfort to the user since we can operate it by....
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The UTC H654 is integrated Hall Sensors with complementary output drivers designed for electronic commutation of brushless DC Fan. It composed of an on-chip Hall voltage generator, a differential Amplifier Schmitt Trigger an open-collector output on a single....
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Modify it to click and latch a relay when i press the button from any ware in the house. Also if it is somehow possible unlatch the relay when pressed again. Im sure you know what i mean. I was looking at it, all i think i have to do is create some sort of....
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The device we then build will function as a metal detector that can scout out metal objects, such as coins, nails, keys such as car keys you may not be able to find, and even gold if you`re looking for in a beach (though this one may not have industrial....
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Model aircraft pilots like to use PC-flight-simulator software to train the handling of model aircraft without the risk of the loss of real models. It makes sense to use the own model aircraft remote control (RC) as input devise for the software. This....
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The circuit described here provides around 180mA current at 5.6V and protects the mobile phone from unexpected voltage fluctuations that develop on the mains line. So the charger can be left ?on? over night to replenish the battery charge. The circuit....
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A circuit towel} {more i guess oscillations are composed, respectively r Houle Wang oscillator sweep enlighten transistor Ti, n and n, 7j composition. Q constants rl day cycle ..
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This is the built servo amplifier and circuit diagram. This is a simple and ordinary op-amp circuit, there is nothing difficult. However it has power amplifier and small signal amplifier on the board together. You have to pay attention to unintentional....
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The following circuit shows about Nixie low voltage PSU With 555 Timer IC. Features: The coil used in this schematics is bought in the shop, ....
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This project is designed for the entry level laser experimenter. The circuit allows any two computers with serial (RS-232) communication capability to communicate over 200 meters using a laser beam. A low cost transmitter only circuit is also presented here....
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This result puts the oscillator in the middle of the UK FM Band (87. 5 - 108 MHz). If L1 has an adjustable ferrite core then its inductance can be altered and fine tuning acheived. If L1 is an air spaced coil then fine tuning is achieved by physically....
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Before we describe how it`s done, note that we recommend that the result be checked as having sufficient brightness for a stop & tail-light application. That`s because the light output may be inadequate, depending on the tail-light lens and reflector....
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Although not a new device, the LM317 is still a high-performance regulator. Its output voltage is essentially immune to fluctuations in load, supply voltage and temperature and this makes it ideal as the central element in a float charger for NiMH cells.....
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Many commercial pest repellers operate in the range of 30 to 50 kHz. My aim was, however, to design a slightly different and somewhat more powerful audio frequency/ultrasonic sound generator that could be used to train dogs. Just imagine the possibilities -....
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A usb powerer laptop Fm transmitter using for home theater and other woofer that have fm reciever to transmits songs of laptop to sound system of ur room...
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This stage adds the TX Mixer to the board and provides the modulation of the Dividers` output signals by the 4 I and Q signals from the TX OpAmps (Quadrature Sampling Exciter - QSE). The result is a double sideband RF waveform that will be coupled into the....
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The circuit in Figure 1 implements a low-cost, micropower, latching motor controller that uses current sensing rather than switches to stop the motor. The design is optimized for a supply voltage of 3 to 9V, making it well-suited to battery-powered....
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This looks like an IR transmitter. IR will not penetrate walls and I assume you mean to use this in a room separate from the room you will be in, so it won`t work...
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Here`s an effective for a temperature sensor to receive power from a 4-to-20 mA loop without actually affecting the loop current (see the figure). This particular temperature sensor IC (AD590F) conducts 1 / when powered by a supply in the range of 4 V to 40....
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In Figure 1 , a basic and versatile 5V supply uses a zener diode and an emitter-follower transistor. You must calculate and design the transformer such that Q1 is close to saturation at low mains voltages and nominal output current. Additionally, you must....
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A device to locate the mobile phone. It emits intermittent flashes and beeps to indicate the presence of an active mobile phone. The circuit becomes active even if the mobile phone is in silent mode. It can be used to detect mobile phone call in noisy....
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There are situations in which very long cable runs are necessary from the pedalboard to the amplifier, or a more powerful driving circuit is needed to the heavy load presented by devices in parallel. A good buffer box is the solution. The best buffer board....
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Fig a shows a multivibrator circuit which can generate square wave signal; Figure b is a flip-flop circuit which uses the under edge of the input signal to generate a trigger pulse signal. Figure c is a monostable circuit which can be used for waveform....
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The LT1886 is a high speed dual power amplifier with
excellent high frequency distortion performance. The
LT1886 features a 700MHz gain-bandwidth product,
200V/ms slew rate and over 200mA of output current
drive in a small SO-8 package. Using only a....
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The four 1K resistors on the output of U6 are too high in value for some parallel ports. Change these to 100ohm. Some LSI based parallel ports use active pull-up resistors and these are lower than the nominal 4K7 which causes a voltage divider effect. A bad....
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Do not use the "on-board" relay to switch mains voltage. The board`s layout does not offer sufficient isolation between the relay contacts and the low-voltage components. If you want to switch mains voltage - mount a suitably rated relay somewhere safe -....
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This is the second part of my USB tutorial for ATtiny2313 and V-USB library. In the first part we learned how to get 3. 3V from USB to power our circuits. In this part, we will expand our setup with following parts: Update: Some people have noted that the....
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Field Strength Meter Using A Biased Schottky Detector A temperature compensated Schottky diode is used in an amplified, untuned field strength indicator that is powered by two AA cells idicates the relative field strength of RF fields from a few kHz into the....
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protection against reverse voltage. The 10mfd provides additional DC filtering. The CD4007 is configured as a flip-flop( )controlled by the foot switch. The output of the flip-flop drives the indicator The 18v appears to go through a 100k resistor, then to....
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This circuit can does all that if you: Hate the volume your wife sets the stereo at, Don`t like your little brother`s TV channel selection, Want to just annoy someone and more by jamming most IR remote signals. Component: Ceramic Capacitor, Electrolytic....
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This basic ultrasonic generator can be built easily and quickly. An NE555 drives a speaker. The frequency range is 12 to 50 kHz. SPKRI is a piezo tweeter, etc. ..
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When the driver depresses pushbutton switch S1, timing capacitor C1 charges to 12 V and turns on transistor Q1, which drives power transistor Q2 into conduction. This, in tum, energizes the relay which has its contacts connected in parallel with the....
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Circuit wire two-color music lantern controller is shown in Figure 1-44 below. a, b terminals at both ends of the speaker according to the speaker, the speaker from the sound o..
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Circuit shown in Figure 3-131. It uses a relay in place of the speed control relay. The circuit is suitable for dusty rings and other poor environmental situation. ..
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This is not new Idea of interfacing LCD using two wires, but it can help in many situations when there is not enough of microcontroller pins. This example is based onHitachi 44780 Alphanumerical LCD. This circuit I provide is only to represent an idea but I....
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Forget to turn off the ceiling fan in your bathroom? Install the simple timer in Figure 1. It`s located out-of-sight in the fan unit, and you turn it on via the wall switch. The circuit costs virtually nothing, using "junk" parts. When ac power appears, a....
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Used several KE 4-211-2 Sennheiser microphones to assemble a device for acoustic signal analysis. They are connected to a National Instruments data acquisition device with ~1 m long cable and sampling rate is set to 50kHz. I`ve added a resistor and a....
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This is a "quick-and-dirty" page that I set up to describe the T1-rate modem that I designed several years ago (in 1993, actually. ) Let me point out that unless you are going to use this on wires, this modem is absolutely useless to anyone other than....
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Smoke and fire alarms are an important part of your home`s safety plan and careful attention must be made to proper fire alarm installation and wiring. The information below will provide some basic guidelines for installing a fire alarm system in your new....
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The TDA1519 circuit can deliver 2x6 watts output power. TDA1519 is an integrated class-B dual output amplifier in a 9-lead single in-line (SIL) plastic medium power package is primarily developed for car radio applications. ..
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This low-cost AM transmitter is tunable from 10 to 15 MHz with the help of ½J gang condenser VC1, which determines the carrier frequency of the amplitude modulation transmitter in conjunction with inductor L1. The frequency trimming can be done with VC2. The....
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this is a circuit of Step-Down Charge Pump Regulator for USB Powered Devices. The critical design parameter of this circuit is the circuit area. To solve this....
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The circuit is a MOSFET based linear voltage regulator with a voltage drop of as low as 60 mV at 1 ampere. Drop of a fewer millivolts is possible with better MOSFETs having lower RDS(on) resistance. The circuit in Fig. 1 uses 15V-0-15V secondary from a....
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This wiring circuit diagram is design for when you want to give supply to particular rooms in the home or office in the building in case of failing the power supply. And you want to supply power continuously to the laptop, computer etc in that specific rooms....
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The original f-m transmitters manufactured by the General Electric Company were the direct f-m type employing the regular electronic automatic frequency control system similar to that discussed in connection with the CBS transmitter. The f-m multiplication....
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Above circuit shows Temperature to Digital Converter diagram using this LM35 sensor with a useful bypass capacitor from VIN to ground and a series RC damper..
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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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The following circuit shows about Chevrolet Malibu 1997 Electrical Wiring Diagram. Features: 2.4L (VIN T) Engine Performance Circuits,. Component: ....
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FM Transmitter is very simple, compact, and has transmission signal with a range of 100-150m, good sensitivity and low current consumption. Transmitter`s schematic consists of a bass amplifier for the first transistor and the proper frequency generator in....