Top Circuits Page 153
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This is a circuit design for high current toggle switch. This circuit was adapted from the "Toggle Switch Debounced Pushbutton" by John Lundgren. It is useful where the load needs to be switched on from one location and switched off from another. Any number....
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A circuit for monitoring supply voltages of ±5 V and ±12 V is readily constructed as shown in the diagram. It is appreciably simpler than the usual monitors that use comparators, and AND gates. The circuit is not intended to indicate the level of the inputs.....
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Audio Power Amplifier is an important part in the reproduction of sound in a sound system. Audio Power Amplifier LM 3886 with power IC Audio Power Amplifier is a highly capable and able to produce 68 Watts with power rata2 4Ohm load and capable of producing....
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after the success of making a data acquisition box for our porsche chumpcar where we were able to collect lap times and telemetry data during our auto club speedway race weekend i decided to create a new ioio box tailored to my turbo this will likely also be....
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This article is copied from replica sites to here in order to have a local and long living copy at hand. It seems like had radical rework done to it sometime in 2006 and original copy of this article disappeared. When discussing SSB transceivers, the first....
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This is essentially the simplest circuit with additional indicator LED`s and appropriate resistor values. The dotted line is to indicate that the IR LED is separated by a length of wire (telephone cable in this case) from the rest of the circuit. The linux....
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This transceiver (combined transmitter and receiver) built by Walter KrG¤mbring uses an Auriel devices for transmission and reception. This device packs a bit more power than the other, as he uses a voltage converter to get 12V to power the transmitter. As....
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This type of cable is a bit more complicated than the unbuffered one, although it is also fairly easy to construct. The cable most often used in this category is the so-called Wiggler cable. The Wiggler is a commercial cable sold by Macraigor Systems. With a....
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There is one switch to reset the board. When reset is held, the board is in bootloader mode waiting for an upload from the development computer for 5 seconds. After 5 seconds, the current program is run. This board can be powered by the USB connector subject....
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MLX90614 is a very useful infrared thermometer (no contact needed) that gives you the average temperature reading of all objects in the view range. In addition to it`s principal temperature reading function, it can be used for movement or even presence....
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By simple, I mean that these circuits only flash one or two LEDs. This is opposed to the light chaser circuits that can flash four or more. Of course, the simplest LED flasher is simply to use a flashing LED. The problem with that approach is you have no....
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Arduino Event-Driven Universal AV Remote May 1st, 2013 Turn Everything on with Airplay TL;DR - I wanted all of my AV components to turn on and ....
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Malcolm Moore`s schematic is good, but it`s not enough for a dangerous man with a soldering iron to do anything useful with. Namely, what is T1 A coil(s) of some type, but the configuration Also Q1, Q2 values ditto SCRs. I was intending to respond to your....
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This was actually used to program my Digital Voice Recorder which I made for my VI sem project. It connects to the Parallel port, and can be used to program any Atmel AVR while it is still in the system, provided the system provides a standard In System....
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It`s a relatively straightforward design, and will probably not be the best way of doing this. However, it works fairly well, and is relatively inexpensive to build. Six independent microphone amplifiers with up to 60dB gain (theoretical, not tested). Each....
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The operation of the circuit starts up and transport the stereo surround sound signal quality information on the master volume circuit. This will drive the left channel connected to LCH Model TL072 IC1A IC1B and attached to the right channel Rch. The outputs....
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This is a circuit of a microcontroller AT89S52 thermometer and LTC1298 12-bit ADC, programs written in C language program with digital filtering and interface the LED display. Reading provides a sensitivity 0. 1C. The hardware block and circuit diagram is....
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The 30 watt amplifier circuit shown below provides an appropriate power boost with an input of 4 watt up to 6 watts. The circuit is designed to cover 88-108MHz FM Broadcast Band. However, the circuit is very stable at my place and provides a clean-output....
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This is an infrared transmitter circuit of the signal is small and using a power supply of 1. 5 V only. by the main electronics are the two LM3909 (oscillator IC LED Flasher) Normally, we tend to put it to work as a simple flashing light circuit. Use a....
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The combination of controller IC LM4651 and LM4652 Class D MOSFET power amplifier IC power amplifier solution provides a high efficiency, suitable for powered speakers, subwoofers and amplifiers car quality. The LM 4651 is a fully integrated conventional....
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FM transmitter circuit very stable and simple given here. With an adaptive antenna, the transmitter can reach a range of about 200 meters. Transmitter met this year and got a few good results. Let`s see how the circuit. A condenser microphone (K1) is used to....
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This is a one chip sound level meter that can be use for displaying sound level of an amplifier or simply the sound level from a microphone. The heart of the circuit is IC LM 3915 Audio level IC. Even though it is a stand alone IC, a peak detector based on....
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This is a Variable Voltage Regulator Circuit that is built by LM317T IC. The LM317T is an adjustable 3 terminal positive voltage regulator capable of supplying in excess of 1. 5 amps over an output range of 1. 25 to 37 volts. The device also has built in....
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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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Electric guitars use coils (guitarists call them pickups or elements) to convert the vibrations of the strings into an electrical signal. Usually, a guitar has more than one element builtin, so that the musician can select with a switch which element or....
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This article will show you how to build your own version of the Fire-Stick infrared remote control system. The LITEON infrared receiver modules originally designed-in to the Fire-Stick have been discontinued, and forced us to re-design the original circuit....
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This is a really simple sound effect generator based single sound generator chip UM3561. The UM3561 will generate four kinds of sound effects. The basic operation is that the UM3561 will generate the sound signal, then the signal delivered to 2N3706 (as....
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A very useful workbench lighting unit for electronics hobbyists. The portable inspection lamp circuit consists of an on-board voltage regulator and a high-bright 5mm white LED. Any 9 to 18 volt dc rated ac mains adaptor, capable to source about 100 mA of....
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This is a low power voltmeter circuit that can be used with alternative energy systems that run on 12 and 24 volt batteries. The voltmeter is an expanded scale type that indicates small voltage steps over the 10 to 16 volt range for 12 volt batteries and....
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circuit of burglar alarm using IC timer 555/556 is functioned as an alarm to prevent thief entering your house. The alarm would produce loud sound when a thin wire connecting resistor R1 with IC pin no 4 is broken. Thin fiber is used as the wire. The thinner....
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With this circuit, the LED blinks every half second. How long the blink time is, can be adjusted by adjusting the value of capacitor C1. Up to 18 additional LEDs can be attached to this circuit (36 LEDs total)...
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The NAND gates use CMOS 4011 chip, a low power component that is suitable for this battery-operated circuit. You can see that this chip is supplied by a 5V voltage coming from an LM7805L regulator. You might wonder what the purpose of this regulation is,....
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Timing capacitor (C1) produces several times constants which is used to allow large voltage swings on the input due to the LM101`s large input voltage range. The R2 should be reduced and the C1 should be increased to keep from exceeding these ratings. The....
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This device has long battery life and low power strain. Another features that this device has are protecting the battery and LED from overloading, trouble free operation such as overtemperature, over voltage, time-out function, undervoltage lockout, and....
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Good information about RF Field Strength Meter Circuit. You can learn and download RF Field Strength Meter Circuit online here....
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Good information about RF Probe Circuit. You can learn and download RF Probe Circuit online....
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Good information about USB Cellphone Charger Circuit You can learn and download USB Cellphone Charger Circuit online here....
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This circuit is design of the counter timer that using countdown calculation. This circuit is using 555 IC as main control. 555 IC is a counter IC and a transistor switch to activate a relay either ON/OFF (mode selected by a jumper) as soon as the counting....
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This power supply was designed for use with the Simple hybrid amp` published elsewhere in this issue. It is of course suitable for use in other applications as well. We`ve used a cascade generator for the 170 V, a switch mode supply for the 16 V, a series....
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This circuit was designed to protect a dual rail power supply from shorts across the two rails. It uses an optocoupler to monitor each supply rail, with the internal LEDs powered from ZD2 and ZD3 and the associated resistors. While the LEDs are on, the....
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The circuit described here can create three different US-style` siren sounds: police, ambulance and fire engine. The desired sound can be selected using switch S1. The circuit can be used in toys (such as model vehicles), as part of an alarm system, and in....
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FM transmitter or often called fm transmitter uses 2 transistors in this article uses 2 transistors 2n2222. If the fm transmitter is in use voltage supply of 9 volt battery and use an antenna whose length is less than 12 inches, then this fm transmitter will....
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FM Radio Receiver IC TDA 7012T is very simple, but it has an FM radio receiver sensitivity and good selectivity. Single Chip FM Receifer cool name of IC TDA7012T 7012T TDA is to build an FM receiver requires a few additional components. Feature contained in....
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This circuit operates with 230v. you can use this circuit to decorate your parties. I think this will be a wonderful circuit to you all. This circuit was taken from my old circuit book called 100 circuit book. Here DIAC ER 900 and Triac BTW 11-400...
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When testing circuits with a logic probe, it is sometimes difficult to watch the LEDS on the probe to determine the logic state. With this probe the logic states are audible. This probe is designed for TTL circuits only but could be modified for CMOS. The....
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A square wave generator with IC UA741 range shown here. The circuit uses positive feedback to the Schmitt trigger action and negative feedback to measure the time of the waveform. Let us assume that the output is high and the capacitor C1 is fully....
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This tremolo effect circuit uses the XR2206 and the TCA730 IC which is designed as an electronic balance and volume regulator with frequency correction. The circuit is usefull for stereo channels and it also has the ability to simulate the Lesley effect aka....
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This circuit is designed to drive the 1W LEDs that are now commonly available. Their non-linear voltage to current relationship and variation in forward voltage with temperature necessitates the use of a 350mA, constant-current power source as provided by....
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This circuit functions with inaudible (ultrasonic) sound. Sound of frequency up to 20 kHz is audible to human beings. The sound of frequency above 20 kHz is called ultrasonic sound. The circuit described generates (transmits) ultrasonic sound of frequency....
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This is a simple design schematic circuit for phase control circuit. The circuit can be used to control the power delivered to an AC load. The phase control circuit can control the AC waveform, cutting the cycle to give full cycle, half cycle, zero cycle, or....
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Here we are using the Trigger and Threshold pins (2 & 6) to detect the maximum and minimum levels, respectively. The two voltage comparator op-amps inside the 555 control the output, turning it on/off. Looking at the circuit diagram you will notice that the....
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A simple USB powered lamp that can be used to light your desktop during power failures. The circuit operates from the5 Voltavailable from the USB port. The 5V from the USB port is passed through current limiting resistor R2 and transistor Q1. The base of....
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Low Voltage Monitor circuit is highly desirable for security and protection against everyday damage your equipment, especially for your favorite car. This circuit may be very simple / very simple to make because only by using ic LM339. The workings of this....
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Hello, I`ve made a DS18S20 -based serial port temperature sensor. I would like to connect it to the usb port on my Asus WL-500gp v2. The temperature sensor works perfectly on the pc connected to a serial port directly, but I can`t get it to work with my....
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In today`s world Personality Power, everyone wants to have a magnetic personality. It`s just the best way to get what you want and who doesn`t want to get what they want? You need to know how to have a magnetic personality and you need to know NOW!....
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The completion of a 35 year project to build a practice guitar amp....
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After building the Mighty Mite amplifier project, I found that it needed something extra to give it character. I thought a nice Hendrix-style fuzz face would add a nice edge to the tone as well as allow some character to come along with low-volume playing.....
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As with any audio mixer circuit, a slight loss is always introduced. The final summing amplifier has a gain of 2 or 6dB to overcome this. The Input line level should be around 200mV RMS. The mic inputs are amplified about 100 times or 40dB, the total gain of....
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The 1K resistors in the circuit are essential so that the LED`s turn on at different audio levels. This circuit is easily expandable with more op-amps, and is not limited to use with the LM324. The 33K resistor on the schematic is to keep the signal input to....
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Here is the circuit diagram of a simple 24W mono amplifier using IC TDA1516. The TDA1516 is an integrated class B power amplifier in a 13 pin SIL package. The IC has many useful features such as short circuit protection, load dump protection, thermal....
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TDA7560 is a 4 x 50 watt quad bridge car audio amplifier. The inputs are compatible with TDA7560 soil and can tolerate very high input signals ( ± 8Vpk) without sacrificing performance. If Hz are included as standard input capacitors (0. 1mF), reducing the....
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Although the modular Portable Mixer design available on these web pages has become a hit for many amateurs, some correspondents required a much simpler device, mainly for mixing mono signals. This design should fulfil their needs, featuring three inputs with....
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The important part of the circuit is formed of the Colpitts type oscillator. C3, C4, C5, C6, CD1-CD2 and L1 determines the frequency. BF982 and dual gate MOSFET are active parts in the oscillator. When the input impedance of the MOSFET gate inputs are high,....
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This project is based on integrated circuit from Holtek Semiconductor HT6221/HT6222. Similar parts used to be produced by NEC Semiconductor uPD6121/uPD6122. These ICs are commonly used in television and VCR infra red remote controls, garage door controllers,....
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This circuit is a complete application is 2. 1 amp, two satellite speakers for TDA and one for the subwoofer, making the 2. 1 system, widely used in commercial applications as an amplifier for computers, which may give an increased in its audio system with a....
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When the switch is pressed C3 charges up through R4 with a time constant of 0. 47 seconds and when the switch is released C3 begins a slower discharge through R7 and R3 with a time constant of about 5 seconds. The op amp 358 used in this project is set up as....
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It is based on the Miller solar engine and has no digital electronics involved. But before we get started, it must be said that a robot is defined as "a mechanical intelligent agent which can perform tasks on its own". Note that the definition does not state....
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The nominal voltage of the solar charger circuit module is determined by the number of battery cells to be charged. Because of the typical voltage drop of 0. 3 to 0. 4 V across Schottky diode D1, the nominal voltage should exceed the charge voltage set on P1....