Popular Circuits Page 4
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Collaboration with the dancers balanced bridge long on the porcelain unit Sync adjustment rheostat speed control system shown in Figure 3 to 183 in FIG. Others, such as electro..
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This was a final project for an optics class EE 134 at Stanford. It was an open-ended project to make a fully functioning laser microphone the class was geared to demonstrate optics and photonics in the lab, not necessarily electrical schematics. There are....
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Micropower and low-voltage op amps allow you to build high-performance analog-signal processors that require no batteries or wall transformers. Instead, you can use a capacitor as a power source. The circuit in Figure 1 shows an analog mixer designed for....
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The LED is 3V, and according "to the internet" (there was no manufactorer info on it) a blue LED usually supports up to 0. 03A. Since I have spare current from the USB I thought I should build a parallel circuit. Now, the last class on circuits I had was on....
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IC4, MAX232, is used to connect to the PC by serial port. This connection is useful for debugging and controlling the robot by issuing the command through the keyboard of the PC. Though in real autonomous run of the robot, this connection would be taken off.....
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555 bistable mode, stable and non-stable than single modes of application is relatively less. Bistable mode means that the circuit composed by R-S trigger mode. As shown by a m..
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A new type of remote control based on ultra sonic sound. The transmitter part of the circuit is build around IC1(NE 555). The IC1 is wired as an astable multi vibrator operating at 40KHz. The output of IC1 is amplifier the complementary pair of transistors (....
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Hello all, I`m new to lasers, but am intrigued by them. I went to walmart and got myself a cheap red laser pointer / LED light combo key-chain. My....
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An interface circuit based on optocouplers provides galvanic isolation and common-mode noise rejection between low-voltage microcontroller units and high-voltage integrated power modules in motor-drive applications. Optocouplers provide high-voltage....
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The standard Class AB audio power amplifier allows for direct coupling of the output of the amplifier to speakers. This is very good in that no capacitors or transformers get in the way of the sound quality coming out. The speakers are connected directly....
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This circuit produces a very high voltage and care must be used to prevent getting a nasty shock. The transformer can produce over 1, 000v and the 8-stage multiplier can produce up to 20, 000v..
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50-watt PMS hi-fi amplifier for an 8-ohm load. This circuit delivers about 56 volts peak to peak across an 8-ohm load. Distortion is about 1 % at 20 kHz. The ganged switch at the input is for selecting either disc or FM radio. The input 741 stage is a....
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These units can be useful as a short-range, single-channel remote-control. When the pushbutton in the transmitter circuit is briefly activated, the LED D1 in the receiver illuminates and an optional beeper or relay can be operated. Circuit operation is based....
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On occasion, microprocessors/microcomputers and microprocessor crystals just aren`t compatible with each other. Many microprocessor data sheets specify maximum values for a crystal`s equivalent series resistance (Rs) that aren`t met by some crystals....
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A typical application example shown, SAA1042 12V stepper drive motivation, phase winding current is taken as 200mA. Choose from the RB Figure 5-10, taking RE = 56kfl. It is connected to the output of ..
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In this project AT89S52 microcontroller is used for interfacing to various hardware peripherals. The current design is an embedded application, which will continuously monitor a moving Vehicle and report the status of the Vehicle on demand. For doing so an....
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I have received a number of emails requesting schematics for infa-red remotes. So here is one. This remote transmits a tone using an infa-red LED. This tone is decoded by the receiver. Since the receiver only switches when it "hears" the tone, there are no....
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The TTY and the detector-transmitter unit are connected to separate phone jacks on the same line. When the ring sensor detects an incoming phone call, it activates the transmitter, which sends an RF signal to the receiver in the pager device. The receiver....
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Apply a signal to each differential amplifier input pair. When the gate voltage is changed from one extreme to the ot..
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MPEG-4 modules realizing real time compression & expansion plus network transmission of video data. The portfolio also includes small camera boards with image correction function...
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Graphic equalisers are made of 15 or 30 band-pass filters, one for each 1/3 octave frequency. Conventional equaliser designs use standard discrete components to realise these band-pass filters. Apex GX- and PE- series achieved far better results by using....
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The display shows each increment. By using mode 2, external debouncing of the gate switch is unnecessary, provided the switch bounce is less than 35ms. The 3 V lithium battery can be replaced without disturbing operation if a suitable capacitor is connected....
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As shown for the detector circuit multiplication. The circuit is a single-sideband amplitude modulation signal detector, its principle is to demodulate the received single sideband (SSB) and the receiver to recover the signal transmission..
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The adjustment control for the contrast of an LC-Display is typically a 10-k potentiometer. This works fine, provided that the power supply voltage is constant. If this is not the case (for example, with a battery power supply) then the potentiometer has to....
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A high voltage step-up DC power supply using adjustable flyback conversion...
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Most PC enclosures provide only a single LED to indicate hard disk access, with the LED being connected to the motherboard via a two-pin connector. However, this LED only works with IDE drives, and if a SCSI disk controller is fitted, its activity will not....
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This circuit uses LTC1043 to differentiate between a temperature sensing network and a de reference. The single-ended output biases a varactor-tuned crystal oscillator to compensate drift. ..
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A circuit that can be used to flash two Christmas stars alternatively is given here. The IC1 NE 555 is wired as an astable multivibrator here. When there is a positive pulse from the output of IC1, the transistor Q1 conducts and the relay K1 gets activated.....
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This project takes after the VGA-to-Scope converter by using composite video rather than VGA signals to create a display on an oscilloscope. The circuitry in the VGA-to-Scope converter has been greatly simplified; op-amp buffers and inverters were....
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MIL-PRF-19500/543; Semiconductor Device, Transistor, Field Effect, N-Channel, Silicon, Repetitive Avalanche Types 2N6764, 2N6764T1, 2N6766, 2N6766T1, 2N6768, 2N6768T1, 2N6770, and 2N6770T1 [TO-204AE; formerly designated as a TO-3] TO-204 Flange mount.....
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This network wiring tester comprises two elements, a transmitter unit, powered and fitted at the network start point, and a receiver unit, passive, which can be moved around from socket to socket. Each of these units carries eight LEDS, identically labelled....
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Every electronic device that boost electrical signal can be called an amplifier. The various amplifier types only differ in some specific features such as:....
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CA3062 combined photodetectors and power amplifier in response to the optical signal generated by the on/off output. Integrated circuit transistor output saturation should be o..
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30 incandescent lightbulbs be controlled by my arduino uno on 3 channels (10 bulbs to a channel in parallel). I`ve used the arduino before to control a number of red, green and blue LEDs - I used a simple schematic using three transistors. I`m just not sure....
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This simple robot, which responds to light and avoids obstacles, can be built without using a microcontroller, programmer or PC. The only special` component in the circuit is a window discriminator (a fancy version of a window comparator). Resistors R1 and....
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The circuitdescribed herecan be built and used in your vehicle for an automatic dipping and dimming operation of the headlamps, in response to the intense lights coming from an opposite vehicle headlamps. You must have come across this irritating situation....
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The ELM622 by ELM Electronics is a preprogrammed PIC which converts commands from a Sony infrared remote control into a serial data stream. An IR receiver using a ELM622 requires no kernel modifications. This project shows how to build a Linux IR receiver....
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AD654 voltage-frequency converter is a low cost, they can work at + 5 ~ + 36V single supply, can also work in 5 18V dual supplies a maximum input voltage of 36V, the maximum op..
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Building circuits to interface an Amiga A1200 to a PC AT/ATX power supply and tower case....
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Interfacing with a HD44780 compatible display using some DIP switches and a few other components. The module that we are using is a 16 character x 2 line display that we stock over here. It uses an ST7065C controller, which is HD44780 compatible. The figure....
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A simple audio level meter or a Volume unit VU level meter circuit with diagram and schematic. This sound level meter is designed using transistors with a flat frequency response in the range of 20Hz to 50Khz....
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This circuit is a simple approach for converting a loud speaker into a microphone. When the sound waves fall on the diaphragm of a speaker, there will be fluctuations in the coil and there will be a small proportional induced voltage. Usually this induced....
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The minimal Arduino circuit is dead simple. It relies on the internal 8MHz oscillator (like the Lilypad Arduino). And like the Lilypad, it doesn`t include a USB-to-serial. You have to provide that with a FTDI USB-to-serial cable or with an old Arduino board.....
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schematic of board with PIC16F84 and also other PICs which can be connected to this USB PICKit2 programmer If someone has such please show me, i`d appreciate it, thanks. another question is i heard that if i experiment with oscillator ffrequency on my demo....
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Relays are devices which allow low power circuits to switch a relatively high Current/Voltage ON/OFF. For a relay to operate a suitable pull-in & holding current should be passed through its coil. Generally relay coils are designed to operate from a....
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What got me interested in building these diminutive devices is the S3FM connector assembly made by Switchcraft. The S3FM is simply a 3.5-inch tube fitted with a male XLR at one end and a female at the other, with enough room in the middle to build a mike....
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This is a circuit for accelerometer amplifier. This is a simple circuit. Precision accelerometer needs inverting mode amplifier since they are usually charge-output devices. This amplifier is convert charges into voltage output. The circuit below is an....
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The single-junction transistor is always used in the sawtooth generator and pulse generator, and it also can form the simple sine wave generation circuit. As an oscillator circuit of the discrete component, it uses fewest components. As the figure shown,....
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Although the respective inputs are differential inputs, but the right amplifier is greater than the general OP bias current (800nA), so as the input coupling capacitor, confide..
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The LWDAQ Driver (A2037) is a Long-Wire Data Acquisition ( LWDAQ ) Driver. You will find an introduction to the LWDAQ in the LWDAQ User Manual. The A2037 provides eight LWDAQ driver sockets, each of which may be connected to a LWDAQ device or a LWDAQ....
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A TV flyback transformer can double as a low-power Tesla coil. The Tesla circuit consists of a pulse generator, a driver circuit, and a high-voltage transformer. Resistors R1 and R2 determine the time duration that the output at pin 3 is off, while R3 and R4....
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This circuit canbeused for detecting infrared light, for example, it is used for detecting infrared band light signal in spectrophotometer. Amplifier output voltage Vo=Is·Rd·Rf/Ri wherein : Is-signal current; Rd-optical detector essential resistance Dector....
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This FET probe has an input impedance of 10 M!J shunted by 8 pF. Eliminating the protective diodes reduces this impedance to about 4 pF. The frequency response of the probe extends from de to 20 MHz ( -1 dB), although higher frequency operation is possible....
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as the picture shows. BA313 is a built-in automatic level control circuit (ALC) of audio recording preamplifier circuit, commonly used in the cassette tape recorder, 9-pin DIP dual in-line package,..
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A high performance op-amp that sets a new standard of excellence in noise performance only 0.9nV/Hz with low source resistances. Total harmonic distortion is less than 0.01%. The op-amp is suitable for use in high quality audio, low noise frequency....
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Circuit shown in Figure 3-146. This eliminates the need for a step-down transformer line, using the principle of energy storage capacitor discharge realization brake, it can be..
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Mono high power amplifier is actually a powerful 1400 W, but if this hihgh power amplifier circuit is doubled and you want to create stereo, high power amplifier the necessary components and pcb requires two-fold. So if the stereo high power amplifier 2 X....
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The T5753 is a PLL transmitter IC which has been developed for the demands of RF low-cost transmission systems at data rates up to 32 kBaud. The transmitting frequency range is 310 MHz to 350 MHz. It CAN be used in both FSK and ASK systems. By ATMEL....
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This audio mixer circuit diagram electronic project is designed using few common electronic components. This audio mixer circuit project has two input channels. The input signal can be independently controlled using the R1 and R2 variable resistors. The R3....
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This dual polarity power supply is easy to build, requires few parts, and is adjustable from 0-15 volts. It is great for powering op amp circuits, as well as other circuits that require a dual supply voltage...
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Light filtering through the finger tip is detected by the cadmium sulphide photoresistor CD1 which forms the feedback network for transducer amplifier section ICA producing a weak signal which is further amplified by ICB. This signal is now compared against....
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Input signals from the power line are coupled through C23 and R19 to the input filter network. C23 must be rated at 600 volts. Switch 52 is used as an attenuator. Components C2 through C7, L1 through L3, R1, and R20 form a triple-tuned bandpass filter....
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Null detector uses simple LED readout to indicate if test resistor R* is below, equal to, or greater than test resistance Rref. IfR* = Rref, the 741 output sits at midpoint value of 4 volts and LED A lights..
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This circuit uses MM74HC942, a single chip low-speed modem which is compatible with Bell 103 standard. This Bell 103 modem circuit is run at 300 baud in full...
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This circuit is a modified hartley oscillator with a couple of extra components included. The transformer is a small audio transformer, type LT700. The primary is center tapped with an impedance of 1Kohms at 1KHz. The secondary has an impedance of 8 ohms.....
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Circuit shown in Figure 3 a child opening the main amplifier balanced by the electromagnetic pickup, line amplifiers and high tone control circuit consisting of roads and other..
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This Sealed Lead Acid Battery Charger is deigned using the LT3755 DC DC controller. The LT3755 is a DC DC controller designed to operate as a constant-current source and supports a wide input voltage range from 4. 5 up to 40 volts and a can provide a maximum....
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Using two SCRs, this control circuit is designed to lock out the other SCR when one has been triggered, so only one lamp will light. Indicator lamp Il is controlled by SCRl. The operator simply presses switch Sl. Lamp I2 is similarly controlled by S2....
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This design notes shows a UHF 3-element portable antenna with gamma-match...
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White Light Emitting Diodes recently available can be used as a powerful alternative to incandescent lamps in lighting applications. Today`s White LEDs are....
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I had been putting off writing a driver for some 24LC64 and 24LC256 EEPROMS I was thinking about using, when I came across a temperature logger application written by Seal Ellis. The Temperature logger was posted on on www.avrfreaks.net on January 10, 2002,....
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Structure and working principle of this circuit is basically the same as the previous circuit, but with some of the components used in the functional minor Ran o First show different bands of the circuit is divided into seven bands, the center frequency of....
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Normally home appliances are controlled by means of switches, sensors, etc. However, physical contact with switches may be dangerous if there is any shorting. The circuit described here requires no physical contact for operating the appliance. You just need....
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Amplifier circuit with IC STK is tough and good quality. In this article an amplifier circuit with IC STK another base. Power "Amplifier 200Watt By STK4050. Auto Wiring Diagram Advanced Symbols. Wiring Diagrams Color Coding For The Speaker Wiring On A 1986....
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You "see" colors, geometry, distance, spatial continuity and discontinuity, motion, connectedness and adjacency. These notions are built into the ways in which you experience and think about the world. You interpret the information returned to your senses....
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Vehicle Anti-Hijack Alarm No3 this circuit was designed primarily for the situation where a hijacker forces the driver from the vehicle. If a door is opened while the ignition is switched on - the circuit will trip. After a few....
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If the sensor system need an active supply, we can use only a single pair of cable to carry both the power supply and the output signal. Not only simplify the...
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PIC16C57-RCT is communication single-chip microcomputer integrated circuit, which is widely used in Qiao Xing series of IC card management telephone. 1. Function descriptionPIC16C57-RC integrated circuit includes pulse and dual-tone dialing circuit, memory....
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FIG. (A), (b), (c), (d), respectively, which output can directly drive transistor, thyristor, relay, COMS circuits, TTL circuits. ..
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The following circuit shows about 3V Power Supply For RF Remote Control Circuit. This circuit Based On the AT90S2323 IC. Features: 2400bps ....
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The following circuit shows about Schematic Diagram Of LED Sequencer. This circuit based on the 555Timer IC. Features: 555 timer circuit to debounce a mechanical switch, 555 timer circuit to produce clock pulses, pulldown resistor, 4017 decade....
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Portable radios, CD-players and cassette recorders that can also be operated from mains power often do not have a mains power switch, but instead are swit....
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The EQ-2 it is a circuit of graphic equalizer 6 band of regulation. Each band is regulated from the potesometers RV1-6, that are, for better optical indicate of regulations, Fader. This does not mean that we cannot him replace with simply potesometer. In the....
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Field effect transistors voice amplifier, the input impedance of the transistor is low, only lkCZ, requiring signal source provides a constant current signal to work. The field..
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Some of you might wonder why a charger is needed at all, to charge a 12 Volt battery from a 12 Volt source! Well, firstly the "12 Volt" source will typically vary anywhere from 11 Volt to 15 Volt, and then a battery needs a controlled charge current and....
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One of the first lessons that an electronics student learns is that an LED provides light from current flow. But, did you know that an LED put in backwards provides current flow from light Yes! It`s true. Hook up a high-quality ultra-bright red LED by itself....
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The circuit uses two 2N3819 FET`s in cascode configuration. The lower FET operates in common source mode, while the upper FET, operates in common gate, realising full high frequency gain. The bottom FET is tunable allowing a peak for a particular station.....
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This is an image Schematic. No Description available...