Popular Circuits Page 42
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The noninvertiiig terminal of the op amp is grounded, and the circuit uses the voltage at the inverting t..
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Tutorial on Interfacing the 20x4 LCD module to PC parallel port...
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A Thermistor is used in the circuit for sensing the heat and two 5K variable resistors are used to adjust the circuit to activate the relay on the desired temperature. The purpose of using the 1N4007 diode across the relay is to limit the back EMF of the....
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In this section we would like to introduce you a transistor oscillator circuit, called as RC Phase shift Oscillator. First of all we need to know what is an oscillator. An oscillator is an electronic circuit which acts as a sine wave generator. The only....
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The Saver V5. 0 runs simple clock emulation program, turns a night light on and off with preset time, say 19:00 to 22:00 everyday. The design features low cost, easy installation, no battery backup and no EMI. The AT89C2051 uses external oscillator generated....
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Capacitive circuit duty cycle is very low, in the range of 1-10%. When the current is only 50mA, the battery current consumption is only 1 A. R4 and C control the opening time,..
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As my first electronics-related entry, I would like to share a modification of the current limiter add-on by Ron J. The original circuit works as advertised, however I needed to disconnect the load immediately after the maximum current was reached, what I....
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A voltage-controlled oscillator or VCO is an electronic oscillator designed to be controlled in oscillation frequency by a voltage input. The frequency of oscillation is varied by the applied DC voltage, while modulating signals may also be fed into the VCO....
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Build A 20 Amp 13.8 Volt Power Supply Row circle There are some applications Electronic that you may need to run a relatively high current circuits such as tra...
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Imagine the convenience of selecting TV channels using your remote and then pointing the same remote to your switchboard to switch on/off the fan or the tubelight. Here is a simple circuit to remotely switch on/off any electrical device through a relay using....
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This equaliser is designed as a preamp suitable for musical instruments - guitar, bass and keyboard in particular. Unlike most conventional graphic equalisers, each slider ranges from fully off to fully on, and not the more conventional +/-12dB or so that is....
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The circuit"s frequency of oscillation is/= 2.8/ [C1 x (R1 + R2)]. Using the values shown, the output frequency can be varied from 60 Hz to 20 kHz by rotating potentiometer R2. A portion of IC1"s output voltage is fed to its noninverting input at pin 3.....
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The Digi-Tach contains a master-clock circuits (U6)v latch and reset pulse generators (U2-b-U2-d), input signal bonditioner (Ul, U2-a), pulse counter (U3), display and display drivers (DIS1, DIS2, U4, and U5), and a voltage regulator (U7)...
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AutoZone Repair Guide for your Engine Performance & Emission Controls Components & Systems Camshaft Position Sensor....
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Most thefts happen after midnight hours when people enter the second phase of sleep called ‘paradoxical sleep. Here is an energy-saving circuit that caus....
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This PIC-based hardware circuit accepts texts from a PS/2 keyboard and converts it into a morse code audio signal....
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This circuit is very useful while checking/operating counters, stepping relays, etc. It avoids the procedure of setting a switch for the required number of pulses. By pressing appropriate switches S1 to S9, one can get 1 to 9 negative-going clock pulses,....
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Circuit The circuit diagram provided is a triac - diac electronic fan regulator that would reduce your power usage of electric fans even in slow speeds. A normal resistor-inductor fan regulator heats up to waste eneegy when the fan is running with lowers....
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The configuration bytes are probably all OK, but then maybe there is a problem in the communication part (writing bytes via SCCB). This is going well for the moment even though I haven`t reach goal yet, started yesterday, but I just wondered if you ever....
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The single line diagram is circuit diagram where "one-line" is shown to represent three phases of a three phase power system. In addition to showing the ratings and size of electrical equipment and circuit conductors, a properly drawn one-line diagram will....
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AUD.LIMITER The level can limit level trim potentiometer to adjust. If you exceed the level of the potentiometer, the output from the half of the operational amplifier (as a co..
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ome games are easier to play with digital joystick instead of analogue type. Unfortunately PC has only analogue joystick connector, which makes it impossible to connect normal digital joystick to it. But with a little adapter circuit, it is possible to use....
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The TX500 is a simple to build 500mW FM Transmitter. It consists of three blocks; modulator / oscillator, two stage 500mW VHF amplifier and LED based power meter. The TX500 allows to transmit audio signals to FM band at frequencies from 88 MHz to 108 MHz.....
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As shown, the circuit is powered by a 9-V battery, B1, but it can easily run off any 7- to 10-Vdc power supply. At the heart of the thermometer is IC1, an LM34 temperature sensor. That device produces a voltage between the Vout and GND terminals that is....
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This pages contain information about building your own version of the Calrec PQ1549 Equalizer, the one found in the Calrec "Polar" desk. This EQ is one of my absolute favorites when it comes to standard IC-based types, so I made this project to make it....
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The circuit consists of separate amplifiers—one for each station—rather than a single amplifier and a time sharing arrangement. Ul and U2 are low-voltage audio amplifiers, each of which operates as separate entities with switches at either station....
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This circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low voltage, low drain battery operation and small size, the device is suitable for mounting on bicycles....
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Europe's leading SGS-THOMSON STMicroelectronics recently introduced a tone quite new to the Chinese mainland hydrazine fos power integrated amplifier TDA7294, swept past the linear integrated..
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This circuit will produce over +10 dBm in the 1800-3 000-MHz range. Drive power is 7 dBm in the 900-to-l 500-MHz r..
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This little circuit will pay for itself many times over the first time it is used, especially if you are in the shower. This back-up lamp stays off as long as light falls on the CdS photocell from either the NE-2 or from room ambient light. So, if the power....
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Each audio/video output can be switched to any of the 8 inputs, separately. One module drives one audio/video output and has a 34-pin connector to plug into the system interface. You can use video OPA-s on the 4051 output instead. Note that you can get full....
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This amplifier is designed to be as flexible as possible, with no bad habits. Indeed, it will operate stably with supply voltages as low as +/-5V (completely pointless, but interesting), all the way to the maximum supply voltage of +/-70V. The only change....
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A guitar to MIDI interface was designed that was intended to serve as an interface between guitar playing and MIDI control of external hardware and software. This document describes the details of the design, experimentation, implementation and final outcome....
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Save fuel bills and the economy of the planet with this circuit. SW1 is a normally open press button switch which allows you to view the level of hot water in a hot water tank. When pressed the voltage difference at the junction of the thermistor and preset....
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The following figure shown an example of a three-output flyback regulator built using LM2577 that has electrical isolation between the input and output voltages. The values shown in the circuit diagram will be 5V for the voltage. An electrical isolation is....
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A device through which an electric current flows and which changes electrical energy into another form. Power consumed by a device or circuit in performing its function. A load my be represented by a resistor and capacitor. The capacitor used in the load....
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When the battery voltage is 11. 5V or less transistor Q1 is turned on and the LED D1 will be bright. When the battery voltage is between 11. 5 and 13. 5 V, the transistor Q2 is turned on and the LED D2 will light up. When the battery voltage is 13. 5V....
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No description available...
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This circuit will flash a bright red LED (5000 mcd) as an attention getting device or fake car alarm. Component values are not critical and other transistors may be used. Flash duration is determined by R2 and C1 and is approximately 3 time constants....
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The input range of the USB-DUX sigma board (+/-1. 35V) matches perfectly the output voltage range of the LM35. GND is available on many pins on the HD connector (check out the pinout ) so that you can choose the ones which are easiest to solder to. R5 should....
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When Sl is depressed, Cl begins to charge to the supply voltage. That places a forward bias on the gate of Ql turning it on and supplying current to load resistor RL. When the charge on Clleaks off, the transistor shuts off, cutting off current to the....
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this verified project provide idea, circuit and working of the system LED display temperature indicator. Digital temperature indicator.using V/F converter.various electronics project...
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Here the schematic diagram of mic preamplifier which build based on operational amplifier TC251. The TLC251 is operating in low bias. The circuit works with only 1. 5 V supply draws electric current of only 10 mA, so the battery operation will be prefered.....
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This circuit senses the video from the VCR. When the VCR is turned on, video signal is amplified by U3A and to drive Ql, activating Kl. In this manner, it is not necessary to turn on and off two video devices every time. In many cases, this avoids the use....
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A commercial stun gun circuit which produces about 100KV pulses from a 9V battery is shown in Figures 1-2. The heart of the circuit is a power oscillator built around Q1. When the switch S1 is closed, C1 is charged through 1K resistor and the feedback coil.....
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This simple and inexpensive circuit can produce a dual (positive and negative) voltage from a single supply input. It is therefore extremely useful for powering opamp and other circuits that require a dual voltage from a single battery. The circuit will....
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The hydraulic system includes pump No. 8 (Drawing 10) installed on the gearbox, dispenser (1), oil tank (4), hydraulic jack (5) and oil conduits. From the tank oil moves along conduit (9), sucked in the pump (8) and gets into dispenser (1) via conduit (7).....
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A wide range auto turn OFF timer covering 1 minute to 20 hours in three ranges....
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The ·circuit includes a peak detector that irrunediately drives the readout to any new higher signal level and slowly lowers it after the signal drops to zero. The readout is a moving dot or expanding bar display. The circuit can be expanded for a longer....
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This circuit generates MIDI clocks and start/stop messages...
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This circuit shows how to cascade counters and retain correct leading zero blanking. The NAND gate detects whether a digit is active since one of the two segments a or b is active on any unblanked number. The flip flop is clocked by the least significant....
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Circuit works: Rp1 ~ Rp13 scale resistance to the keyboard, but also the oscillator timing resistor, C2 is wide discharge capacitor, S1-S13, the key switch. Press S1 a S13 any one, such as pressing S1, the +6 V power supply..
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Example if you press number 8 it will effect the wire ROW3 and CLO2. By this the microcontrollercan determine what key was pressed with only 7 wires from the keypad. ..
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Why an electronic cricket? Many people like the cricket sound specially if they live in a big town. This electronic cricket circuit works in pulses, so the....
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Dear geekslutz, I have been sort of mucking about modifying my cheap mxl v67s to have a good enough condenser to tide me over until I can afford to....
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This is a Peak Voltmeter circuit. This circuit can be viewed as a pulse stretcher, which catch fast pulse signal to be measured by a slow response voltmeter....
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The 555 is wired as an astable and the capacitor is charged only through the 4,7Kohm trimmer (notice the diode) and discharged only through the 2.2 Kohm trimmer, making the duty cycle full adjustable. The square wave is then feed in a totem pole made up of a....
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This is a complete design circuit for a complete ultrasonic transceiver used in a variety of pulse/echo-ranging applications. Here`s the figure of the circuit; In this circuit, the LM1812 transmits a burst of oscillations with transducer X1. Then, using the....
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This white LED Driver circuit project is based on the NCP5680 high efficiency white LED Driver ic. NCP5680 supports double power flash LED and torch operation. The built-in DC/DC converter is based on a high efficient charge pump structure with 1X, 1. 5X and....
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The Dynaco Mark III is the highest power amplifier that was widely sold under the dyna name. There was a nigher power amp (the Mark VI), but it wasn`t widely available. The Dyna MKIII has a basic design flaw that none of the other Dynaco products have. The....
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An Arduino voltmeter that displays voltage on an LCD display. The voltmeter has 4 channels for measuring four different voltages....
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Using the RF2126 high-power, linear amplifier IC manufactured by RFMD can be designed a very simple and high efficiency amplifier for 2. 45 GHz ISM applications such as WLAN and POS terminals. The part will also function as the final stage in digital PCS....
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Many later radios use four 7-pin valves and require a 90V HT supply at typically 12mA and a 1. 5V LT supply at 125mA or 250mA depending on the valves used. The original batteries are sadly no longer made. One possibility is to make up a 90V battery using ten....
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Here is a able ambit of IF arresting architect which may be of absorption to radio hobbyists and professionals alike. Transistors T1 and T2 anatomy an astable multivibrator aquiver in the audio abundance ambit of 1 to 2 kHz. RF oscillator is congenital about....
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For some time now, there have been a number of tape cassette decks available at low prices from mail order businesses and electronics retailers. Such decks do not contain any electronics, of course. It is not easy to build a recording amplifier and the....
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Chemical mixer circuit having a stirring speed, thermostat and timer alarm function can be used in chemical, steel and other industries. (1) circuit works heating magnetic stir..
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Typically the input protection fuse of your DMM will blow in the middle of a demonstration or an exciting phase of your construction work. Spare fuses are always hard to find, and if available take a lot of time to install. This circuit replaces the fuse by....
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This document describes a Rife Beam-Ray system which was designed and constructed using the latest information available about Royal Rife`s actual frequencies. This system uses a novel method of generating the proper modulation frequency for the 3. 1 MHz....
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Multi-output power supply circuit (MAX1902) It shows the notebook computer motherboard power supply circuit which uses MAX1902 chip for power control circuit, which can be all the way in order..
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The MC34012 tone-ringer chip derives its power by rectifying the ac ringing signal. That signal is normally at 20 Hz and measures between 70 and 130 volts rms. It uses that power for the tone generator and to drive the piezoelectric transducer. The sound....
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I needed a pulsating light for a certain signaling. Voltage was 230V. So I decided to make a simple circuit, consisted of a LED diode, two capacitors, two resistors, a diac and a diode. Activity of the circuit is extraordinarily simple. The capacitor charges....
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When optimally tuned, it will propel a small slug about 1.5 metres high, or 2.5 metres horizontally....
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A sensitive-gate SCR provides a line-holding current of 20 to 40 mA, depending on loop resistance. It also lights an LED to give the user a positive indication that the telephone line is on hold. The 20 to 40 mA should prove sufficient to hold the majority....
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This circuit produces a ringing sound similar to that made by more recent telephones. It consists of three almost identical oscillators connected in a chain, each generating a squarewave signal. The frequency of each oscillator depends on the RC combination:....
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Monitors battery voltage, Three-LED Display Connecting this circuit to the battery of your vehicle, you will always know at a glance the approximate volta....
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The NES version of this hack is very similar to the SNES version and I recommend reading that article first to get a general idea of how these controllers are assembled. The first item you`ll need of course is an original NES controller, which you can....
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Detecting electrical equipment, sometimes in order to more accurately measure the electrical current, the need to disconnect the circuit in series into the ammeter measurements..
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The schematic diagram below show a circuit of high voltage generator. This circuit uses a 4049 hex inverter as an oscillator, and you can use ignition transformer from automotive engine. A fly-back transformer is possibly usable too. The 4049 will drive the....
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This year for Valentine`s Day I decided to get nerdy and make something electronic for Caroline. I first tried to make a animated LED heart with a joule thief and a single AA battery, but I couldn`t make a suitable air coil. So, I decided to modify this....
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This circuit drives as many as four white LEDs in parallel from a 3. 3V source, and adjusts the total LED current from 1mA to 106mA, in 64 steps of 1dB each. The circuit of Figure 1 is designed for portable-power applications that require white LEDs with....
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Although it does not have the same charm as real mercury barometers with long glass tubes on pieces of carved and polished wood, the Torricelli barometer....
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This circuit was submitted by Adam from Canada who is still at school. I have provided the
text. The two transistors are used as a direct coupled switch, Adam used 2SC711 but any
general purpose transistor will do e.g. 2N3904, BC109C...
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** UPDATED 2014 ** This project is the original High power mobile phone Jammer circuit, and all updates are posted here. All other versions are just copied from next.gr. First off all you should be very careful how to use this device. Its fully illegal and....
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The circuit is Easy to construct. TDA2003 is an integrated radio amplifier from ST Micro electronics that like short circuit protection for all pins, thermal over low harmonic distortion, low cross over distortion etc. In the circuit given here TDA2003 is....
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A siren circuit with diagram, which produces a strong,high power siren or alarm sound using complimentary transistor pairs BC 557 and BC 337,arranged as oscillator....
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It is a voltage regulator that allows a 6v portable supply to be derived from the 12v car battery. You can add a 6.2V zener diode and a LED to warn you when the input supply is overvoltage. If you could find a relay that would operate from 6.2v right up to....
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This is a test project built hastily on a solder less breadboard. It uses a LM75 to read the current temperature via I2C and displays the result....
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Circuit at rest (dark) state operation the electromagnet M current flows, once there is sufficient strength so that light shines on the phototransistor is turned on, that is th..
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The circuit was constructed using a few components that is powered by a 9 V battery for sensing the presence of bugs transmitting within the frequency mod...