Popular Circuits Page 167
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I havebeen researching a project which will help me with my understanding of electronics, networking, and programming. I decided to build an online thermometer which could be used in applications that need temperature monitoring. I currently work in a lab....
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This circuit bellow include in the Relay Timer Circuit. One of the most commonly used circuits is that of the 555 Timer I.C. The circuit is ....
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Thiscircuit matches the very high impedance of ceramic cartridges, unity gain, and low impedance output. By "loading" the cartridge with a 2M2 input resistance, the cartridge characteristics are such as to quite closely compensate for the RIAA recording curve...
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The link shows how to inteface Alphanumeric LCD to 8051 Microcontroller. Liquid Crystal Display also called as LCD is very helpful in providing user interface as well as for debugging purpose. The most common type of LCD controller is HITACHI 44780 which....
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Short circuits or broken pcb tracks can be easily recognized by means of a Multimeter, but this tool can give wrong results when testing the efficiency of a transistor or diode, unless the device under test is unsoldered and removed from the pcb. A further....
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AC-DC power supply without power switching circuit normally used for lighting load circuit, once the power grid or power is restored, the standby power supply automatic switchi..
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Turns-off your amplifier when idle for 15 minutes
Fed by amplifier tape-output. This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least.
Pushing P1 the device is switched-on....
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This is a very small telephone exchange attached only two ordinary Tele phones. Fully bi-directional facility with an intercom system. When a phone is in off hook condition, Exchange will detect it & send ringing pulse to other phone. When it will be picked....
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It is useful where the load needs to be switched on from one location and switched off from another. Any number of momentary (N/O) switches or push buttons can be connected in parallel....
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As shown, the length of the transmission wire current loop circuit will introduce a radio frequency (RF) interference, RF energy can cause sensitive XT11l2 / 114 input errors, performance in an unstable loop current or input line current. If the RTD sensor..
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This circuit was designed to control a 32 channel Christmas light
show from the PC serial port. Originally designed with TTL logic,
it has been simplified using CMOS circuits to reduce component
count. It is a fairly simple, reliable circuit that....
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This circuit takes standard 0-10V control voltage (for example from analogue light controlling desk) and outputs a standard 1-2 ms RC servo motors control pulse. Power supply: 4-5V DC (same as for RC servo), consumes 15 mA of current. Control voltage range:....
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This circuit allows a microprocessor system to measure its own battery voltage. A Texas Instrument TI43..
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If they have to be both powered from the battery do I need to connect the emitter to the ground of the Arduino AND the battery to stop all the current from flowing through the Arduino ground and get a clean pulse or do I just connect the emitter to the....
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Each tub sockets has 2 plastic nibs on the back. For each socket I drilled 2 holes into circuit material. Then I pressed the socket nibs into the drill holes. Finally I screwed the stripe of epoxy circuit material to the wood slat. The wiring diagram to....
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In circuit diagrams given in equipment manuals, voltages at various points in the circuit are usually marked. A deviation from these values indicates that some component has failed and eventually leads to clues for isolating the faulty areas. Specifications....
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Part of the difficulty is that multiple caps/resistors are in the circuit in RIAA. This is based on the Harman-Kardon schematic: I don`t have the Cit IV info handy, sorry. but there are so few parts in a Cit IV that it`s easier just to replace them all. If....
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To build it, just follow the schematic as shown. (If you need help, please, do not hesitate to message me!) If you`re having trouble identifying the....
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The circuit can be used as a sensor that can trigger an alarm, without direct contact being made by the intruder. In this circuit, a visible or invisible light source radiates on the sensor, keeping the detection loop in what could essentially be called a....
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No description available...
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The circuit provides for accurate half-wave rectification of the incoming signal. For positive signals, the gain is 0; for negative signals, the gain is -1. By reversing both diodes, the polarity can be inverted. This circuit provides an accurate output, but....
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A compact, inexpensive and low component count telecom head- set can be constructed using two readily available transistors and a few other electronic components. This circuit is very useful for hands-free operation of EPABX and pager communication. Since....
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Long distance HVDC lines carrying hydroelectricity from Canada`s Nelson river to this converter station where it is converted to AC for use in southern Manitoba `s grid A high-voltage, direct current (HVDC) electric power transmission system uses direct....
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TB6556FG 3-Phase Full-Wave Sine-Wave PWM Brushless Motor Controller, Sine-wave PWM control, Built-in triangular-wave generator (carrier cycle = fosc/252 (Hz), Built-in lead angle control function (0 to 58 in 32 steps External setting Automatic internal....
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As can be seen, a power supply is usually the transformer, rectifier filter, adjust the yuan pieces, more zoom, six partial reference power supply and sampling, etc., there are..
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The delay circuit is shown in Figure 1, and uses the Mitsubishi M65830 Digital Delay chip. This has been around for a while now, and is simple and effective (provided that a fixed delay is acceptable). The serial data required to obtain different delay....
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This circuit will run from a single 5 V power supply. The LTC1043 switched-capacitor instrumentation building block provides a differential-to-single-ended transition using a flying-capacitor technique. Cl alternately samples the differential input signal....
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This application note describes a Digital Blood Pressure Meter concept which uses an integrated Pressure Sensor Analog signal-conditioning circuitry, Microcontroller hardware/software and a liquid crystal Display The sensing system reads the cuff pressure....
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Licensing This file is copyrighted. The individual who uploaded this work and first used it in Licensing This file is copyrighted. The individual who uploaded this work and first used it in Licensing This file is copyrighted. The individual who uploaded....
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IR2156 can offer solution of high cost-effectiveness for fluorescent electron ballast. It can integrate lighting tube error protection and the programmable working frequency with warm-up, lighting and ballast continue working...
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Base frequency selection, frequency-selective emitter type transformer coupled oscillator circuit ..
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Georgia Republic inventor, Tariel Kapaladze, claims to have invented a 5 kilowatt free energy generator. In a demonstration video, the device appears to produce copious amounts of energy from no visible source. Though it appears to be extracting energy from....
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The FM broadcast band was moved immediately after World War II from its original spot just below 50 Mc to the present 88-108 Mc band. Hallicrafters was one company to offer receiving converters for those who had the old FM radio sets. The offerings included....
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Used in recording signals from active sonar on magnetic tape, for later playback to control land-based sonar used in training operators. Modulator is basically sawtooth generator whose repetition frequency is changed by amplitude of modulating input signal.....
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This circuit requires the bridging of two circuits to activate the electronic switch. That circuit does not require a 60-Hz field to operate and can be battery or ac powered. The two-pickup terminals can be made from most any clean metal; they should be....
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The circuit in Figure 1 represents one method to switch a bipolar, two-color LED using an SPDT mechanical switch or relay. This circuit wastes power and does not work properly if the power-supply voltage is not substantially more than the sum of the LEDs`....
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One of the most useful gadgets a video enthusiast can have is a low-power VHF TV Transmitter. Such a device can transmit a signal from a VCR to any TV in a home or backyard. Imagine the convenience of being able to sit by the pool watching your favorite....
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With this circuit you can mix four separate audio inputs. Each input will accept high or low impedance microphones, phonograph, tape or aux signals. You can adjust the gain of each input by adjusting each respective pot. With the Stereo/Mono switch you can....
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The circuit uses independent timers to flash two light emitting diodes. Any time that light emitting diode D1 is lit__light emitting diode D2 will be switched off. Light emitting diode D3 is on if both D1 and D2 are off.
Two versions of the circuit are....
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50 Hz 60 Hz frequency generator circuit using crystal oscillator You can generate 50Hz or 60Hz using this frequency generator. This oscillator....
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Build a sine wave generator. I use this schematic:. The op-amp I have used is the TL082 and the power supply of 9V. However, I do get a nasty sound, indicating that I am not getting a sine wave but rather a distorted waveform. Any idea why this is happening....
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A voltage window switch is in practice the basic lower window limit of this circuit is roughly 3V and the upper limit is 9V. The window range can be extended by fitting a suitable range
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The IC1 is a 555 timer IC is connected for, Astable operation the clock pulses are fed to the IC2 via the 10K resistor. The IC2 is a 10 stage counter, output 6 (pin 5) is connected to RESET (pin 15), thus giving us a 6 stage counter , outputs 0 to 5. The 6....
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Most people who want to modify and improve their Spectrum look first at the keyboard as a prime area for change. But straightforward replacement involves digging around inside the computer - something of a put-off, for two important reasons. To begin with it....
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This flasher operates from a 12-volt car or boat battery. It offers 36 to 40-watts output, variable flash rate (up to 60 flashes per minute), independent control of both on and off cycles and photoelectric night and day control that turns the flasher on at....
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Six components can configure a circuit whose output voltage is proportional to its input frequency. The average current (hvc from the 40106 Schmitt trigger inverter"s ground pin 8 is linearly dependent on the frequency at which CO is discharged into the....
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This circuit is 73 MHz Hallogene Radio-Controlled Lights. The purpose is to control the power state of a hallogene light by remote control. When we press the push of a remote control Botton, state lamp power will change, so, if the lamp is lit, it will be....
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The tube headphone amplifier in figure 1 is a high current mu follower, with a 12AU7 cathode follower driven by a 6CG7. Both sections of each tube are paralleled to minimize noise. It's a zero global feedback, OTL design of pretty high quality. I use it and....
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This transmitter consists of a keyed crystal oscillator/driver and a high efficiency final, each with a TMOS Power FET as the active element. The total parts cost less than $20, and no special construction skills or circuit boards are required. The Pierce....
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Using this continuity tester circuit, a failure of? PCB tracks be examined without looking directly at the tracks routing, which is can be very frustrating..
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The K8000 DAC High Power Amplifier is an electronic amplifier whose output can be regulated between 0 and 9 V with an output current of up to 9 Amp?res....
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The High Power Amplifier has great advantages are 5000W ultra-light, high-power audio amplifier, without switching-mode power supply. This ambit is of an 2 x 2, 500W RMS Stereo amplifier, super-light and after switching-mode ability supply. The ambit aloof....
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The frequency formula of 555 oscillator is popularly known. For a known resistors and capacitor, the frequency can be determined by a formula. From the math...
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When the switch is opened, the timer produces an approximate 1 second clock signal, decrementing the counter until the 0 count is reached. When the zero count is reached, the `carry out` signal at pin 7 of the counter moves low, energizing the 12 volt relay....
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This is a new design of a tutorial board based on the popular PIC16F84A microcontroller. It features eight single leds, a 7-segment display, an LCD display and five push buttons. It is an ideal solution for the beginner to take his/her first programming....
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The Arduino site has thorough documentation on how to connect LEDS to the Arduino via the Max7221. For this, you will need this subset of ingredients....
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Feed the cable through some hole in the chassis to the opposite side There, between fan and rear panel, you may install the IFD board upside down. Use a thin and flexible isolating material, as PE or PVC to prevent short circuits. The board should be placed....
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The basic circuit illuminates up to ten LEDs in sequence, following the rhythm of music or speech picked-up by a small microphone. The expanded version can drive up to ten strips, formed by up to five LEDs each, at 9V supply. IC1A amplifies about 100 times....
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Before attempting to build the control circuit, it is recommended that the function of each part the circuit is understood. The schematic below shows the basic functions only. CRS Controller board: The key synchronization signal or Scan Line Clock (SLC) for....
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This circuit regulates a DC power output. It has a very wide application range. It can be used to control the speed of a motor, a pump, a toy train, the brightness of a LED or lamp, etc. Practically, it can be used in any application that uses a regulated DC....
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Stepper motors are available in several versions and sizes with a variety of operating voltages. The advantage of this general-purpose controller is that is can be used with a wide range of operating voltages, from approximately 5 V to 18 V. It can drive the....
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This design is for PC Soundcards obviously. If you need an interface for a Mac see my other page. For other computers and PCs without a soundcard you might take a look at Harmony Central`s interface page. I have built one of these myself, exactly as....
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Cost, size, resistance, and current capability drive the choice of inductor for most stepdown dc-dc switching converters....
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At the point Vp the Emitter triggers and TURN the ujt ON, until this point ; the emitter is isolated(doesnt conduct) from the transistor so no Current Conduction occurs between Base1 and Base2...
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This design idea describes a simple circuit to generate a programmable negative control voltage. It takes the output of a single supply digital-to-analog converter (DAC) and produces a variable negative voltage. The DAC output from 0V to +2.5V is converted....
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This is a simple circuit for automatic switchover between battery and USB port. This circuit uses more general step-up converter architecture. Compared with an....
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Circuit 90s common recorder head amplifier circuit, the choice of ultra low noise precision op amp OPA37 pre-formed head amplifier. Circuit can provide a standard NAB equalizat..
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The output of the amplifier is to be measured on a digital voltmeter. Besides being able to accept 20 na to 200 micro amps and output voltages that range form 100 mv to 2 or 3 volts, the amplifier needed to have a low input resistance so the diode could be....
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During my Digital Projects Lab, the professor recommended I find a way to include more circuit level work into my project. To fulfill this, I decided to build a nice preamplifier which wouldinclude an IR remote control to replace the one I had built....
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This electronic project stereo amp is based on the STK415-090-E class H audio power amplifier hybrid IC that features a built-in power supply switching circuit. This STK415-090-E class H audio power amplifier provides high efficiency audio power....
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This is a simple circuit that does the day/night switchings you have in mind. POT1 is used to set the light level at which the circuit switches from enable to disable...
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IF pre-amplifier circuit shown in distributed-parameter type microstrip circuit. It operates in the frequency band 950-1 470 MFk,..
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Anyone who has designed circuits using the 555 timer chip will, at some time have wished that it could be programmed for longer timing periods. Timing periods greater than a few minutes are difficult to achieve because component leakage currents in large....
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The amplifier provides a total power gain of about 25 dB, and the construction technique allows the use of inexpensive components throughout. The MRF476 is specified as a 3 watt device and the MRF475 has an output power of 12 watts. Both are extremely....
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Driving Helium-Neon Lasers can be simplified considerably using This power-supply configuration. When power is applied, the laser doesn`t conduct and the voltage across the 190- resistor is zero. However, a resonant circuit and a voltage tripler then....
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Many integrated circuits have undocumented features or abilities. This is one of them. The TLC555 output (pin 3) can sink a 100mA load to 1. 28V. The open drain transistor reset (pin 7) can sink 100mA to 1V. Tying both lines together is permissible because....
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Using 567 IC tone decoder/detector, we can build a remote control and or intercom. This circuit can be used to control a relay, or to carry an audio signal....
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Vacuum-tube or electronic voltmeters make use of some of the unique characteristics of electron tubes, and so are available in many types. They are available for measuring direct, rms, average or peak voltages. Of the many types available, only the simplest....
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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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This circuit permits direct connection of composite video signals from video games and microcomputers to the antenna terminals of TV sets. The output signal level is controlled by the modulation input. ..
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Another version of the 1W VHF amplifier for the FM transceiver, well, in fact, it`s still the same version since I didn`t managed to get 1W. YET! Today I made some tests with a 2n2553 and a 2n2866. it melted solder in one of the base resistors (never I had....
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This circuit is basically repeated for each of the 3 motor phases. Here is my experience with repairing the motor control board in this washer. The Q5 mosfet blew out on c phase of the motor drive circuit and the 75 ohm resistor labeled J12 driving this....
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This circuit is a simple adapter for PC parallel port to think that there is a printer connected to computer. This adapter is useful for testing printing speed with different software and as a part of your own designs.
You can use this circuit to connect....
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Simple Inverter for Soldering Iron. Right here is a very simple but low-cost inverter for making use of a small power soldering iron (25W, 35W, and so on) in the absence of mains supply. It requires eight transistors along with a number of resistors and....
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This Voltmeter Ammeter was designed to measure output voltage of 0-70V / 0-500V with 100mV resolution and 0-10A or more current with 10mA resolution. It is a perfect addition to any DIY laboratory power supply, battery chargers and other electronic projects....
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50 impedance as shown in Figure grounds RF2320 linear amplifier circuit configured, input, output, using the transmission line and inductive or capacitive constitute matching n..
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Teledyne Semiconductor"s Type TSC9402 is a versatile IC. Not only can it convert voltage into frequency, but al..
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Electrical equipment supplied to a power supply circuit design power section, as shown below: ..
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Because these transistors are a complementary pair, the circuit using them is very symmetrical. The upper right and upper left corners of the H-bridge are called "sources. " This name originates from their function which is to be a source of current for the....
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By sufficiently lowering output impedence of a circuit and supplying enough current to drive cables, it does not suffer the same problems as passive designs. As such, it seems to solve the many of the problems inherent in both active and passive preamps....
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Whenever I use the 555 timer, it seems that the output polarity is invariably incorrect, and the way the 555 functions, it normally cannot generate a duty cycle of less than 50% ” 90% yes, 10% NO! This inverted 555 circuit generates duty cycles of less than....
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No description available...