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The circuit diagram was designed to create a power supply without utilizing any transformer circuit. This circuit illustrates the advantages as well as th....

A multimeter can be used to test the health of a triac. First put the multimeter selector switch in a high resistance mode (say 100K), then connect the positive lead of multimeter to the MT1 terminal of triac and negative lead to the MT2 terminal of triac....

This is the schematic for an FM transmitter with 3 to 3. 5 W output power that can be used between 90 and 110 MHz. Although the stability isn`t so bad, a PLL can be used on this circuit. This is a circuit that I`ve build a few years ago for a friend, who....

This Simple subwoofer circuit is designed to be connected to an existing car stereo amplifier, adding that often require extra "punch" to music by driving a subwoofer. As the very low frequencies are omnidirectional, a single amplifier is necessary to....

This accurate one-pulse-per-second clock is made with a few common parts and driven from a 50 or 60 Hertz mains supply but with no direct connection to it. A beep or metronome-like click and/or a visible flash, will beat the one-second time and can be useful....

Simple telephone time lock circuit is shown in the above picture. In the circuit diagram, BG1 and BG2 are electronic switches controlled by IC NE555. When the telephone is on-hook, the DC resistance value of the telephone is over 600K?, the current when the....

You can clearly see the three stages found in many audio amps (and op amps today). However, looking at actual audio designs, you`ll find the basic topology has been tweaked and enhanced in a few key locations. Here`s a quick tour of design improvements of....

This circuit allows a remote microprocessor to reset the control of a host by sending an interrupt signal on an RS-232 or RS-422 serial line. If the remote machine is restarted on a simple program loader program, it is possible that the host to stop and....

I am hoping to get some help on a timing circuit I need to build. I need to have a spark plug fire every 10 or 20 revolutions that a shaft....

This alarm circuit was designed to monitor a mains-powered smoke detector located in a shed (which is used to house dog kennels). It provides complete isolation from the mains so that low-voltage (12V) cabling could be run to the alarm circuit which is....

Cathode-follower hydrophone isolation amplifier and high-gain preamplifier feed Navy RBA-6 low-frequency radio receiver on trawler, to receive modulated 21-kc beam that transmits trawl net depth data. -F. H. Stephens, Jr. , Underwater Telemeter for Trawl....

Sections of RS339 quad comparator each drive LED to give indications of four different input voltage levels, While LED 1 is connected to ground for use as zero indicator Resistors shown are for Radio Shack 276-041 red LEDs ›change R6-R9 to 270 ohms and R1 to....

Honda XL100 electrical schematic. Features: shows the connection between Honda parts. Component: Silicon rectifier unit, wiring harness, tail light sub cable, tail/stop light, high beam indicator, m light, speedometer, tachometer, fuse headlight control....

This circuit uses the HgCdTe demodulation device which can be cooled to 77K in liquid nitrogen. It uses a constant current bias for the demodulation device which is connected to the input port. The voltage`s amplification factor is 200 and the bandwidth is....

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Here is a project of a simple touch switch circuit. This circuit and can also be used to activate a relay in the place of LED and resistor. The circuit is quite sensitive because we have used the two transistors as a Darlington pair. The gain is first....

The following circuit Shows about Simple 100W Inverter Circuit Diagram. This circuit based on the CD4047 IC. Features: low power CMOS ....

The joule thief is an electronic circuit that allows you to make use of batteries normally considered dead. A battery is often considered "dead" when it can`t power a particular device. But what`s really happening is that the battery voltage is no longer....

Audio amplifier circuit is very suitable for use at home, using a subwoofer speaker, or woofer speaker. Usually, also called home amplifier, audio amplifiers are based on the IC and ic are used still in series with type STK457 STK and besides it also can use....

Note how the output letters of the integrated circuit [Output A] match with the Diode letters in the 7-Segment LED above. Each IC output corresponds to a particular input [diode] of the seven segment display. 1. BI/RBO is wire-OR logic serving as blanking....

Most PN-junction diodes can be used as photodiodes. While not optimized for this application, they do work. When the diode is reverse biased, it will produce a small photovoltaic output as the light level is increased. LEDs are particularly suited for this....

This is a complete circuit that is shown in the diagram below and is formed by a microphone amplifier built around IC1A, is a design for intercom circuit. In this circuit, there are 2 IC, LM358 that is used to low power dual op amp and 4016 or 4066 Quad....

A circuit which utilizes a photo-transistor to make a light sensitive switch that is when there is no light in room, the led connected to the photo-transistor lights up and when there is light in room, the led connected to Phototransistor turns off Any....

This flip-flop circuit is a free running/astable multivibrator one, with bases and collector of both emitter biased transistor are directly coupled to each other. Switching action is supported by means of capacitor in each emitter circuit. This configuration....

The heart of an average reading, rms calibrated AC voltmeter is shown in figure below. It`s a rectifier and averaging filter. We can remove the averaging function and provide a precision full-wave rectifier by deleting C2 and provide an absolute value....

The required output at the inverter is 220/230V @60Hz. Basically, let me say i need an inverted circuit diagram with an output power of 1000VA. While the first circuit is a simple form of the commercial UPS, the circuit provides a constant regulated 5 Volt....

This circuit is the basis for the dimmers in a model theatre lighting system which uses touch globes as the light source. The circuit is based around a 555 timer, driving a Triac. All dimmers share the one power supply and zero-crossing detector. As it will....

You can choose the Transformer on the grounds of maximum voltage and current output needed. Best choices are: 36, 40 or 48V center-tapped and 50, 75, 80 or 100VA. Q4 must be mounted on a good heatsink in order to withstand sustained output short-circuit. In....

The main purpose of this design was to obviate a small defect of the very popular Fridge Door Alarm circuit, available on this website since 1999 and built by a lot of hobbyists. Unfortunately, that circuit stops operating when the battery voltage falls....

a microcontroller to control a DC motor (permanent magnet DC, DC servo, stepper and DC). In this project we will use microcontroller AVR-008 from Circuits-Home. Because it can be used to control the 3 types of DC motors, the AVR-008 is often called the 3in1....