The fluorescent with reactive power compensation As ballast is an inductive load. It needs to consume some reactive power, causing the power factor of fluorescent lamp decreases. It affects the ability of full-powered devices, and reduces the voltage of....

With the equipment ready for operation, the main line switch (S-831), the EMERGENCY SWITCH (S-12) and the main line contactor contacts K-831B all are closed. (1) The keying relay main contacts (K-1C) ground the center tap of the MO filament secondary of T-1....

An audio mixer is a handy circuit that will combine two or more audio signal sources into one signal channel. The figure shows an audio mixer that is built around the LM3900 CDA. The crux of this circuit is the three input networks, principally R3, R4, and....

The following circuit shows about 5 Zone Anti Theft Circuit Diagram. This circuit Based On The CMOS 4050B IC. Features: system may comprise in ....

A while ago i run across this document which apparently tells how to wire mosfets in series to get higher voltages (pg 10-14). This is the only schematic i found so far that is actually working. The problem is that i can`t make more than 3 mosfets work, when....

You need a TSOP4156 which can be a tough one to get or expensive to buy. I had plenty of old BPW41 Infrared diodes so I decided to build my own receiver. The power comes from the RS232 port, make sure you have at least 5. 5 Volts or the 4001 will not....

This is a small size led flasher built with the 555 timer IC that is powered from 2 x 1. 5V batteries. The circuit can be used as a flashing metronome, dark room timer, memo-reminder or other similar applications. In figure 1 the LED will be ON for a short....

The basic idea is to turn the motor just a little bit every 15 seconds or so. A monofilament line transmits the motion to the ornament. It gets wound by the motor and slowly unwinds by turning the ornament. The charging path has a 1 megohm resistor in it,....

After reading Robert`s article, I immediately wanted to build this project so I ordered an HMC 1001 sensor and started breadboarding the circuit. As it turns out, there were a couple errors in the schematic that appeared in Sport Rocketry. I took Robert`s....

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I designed and built this stomp-box forGrammy-winning resophonic guitar player Stacy Phillips. Stacy typically uses two transducers on his Dobro-style instruments: a piezo element mounted internally and a gooseneck-mounted electret microphone positioned an....

Most analogue multimeters are capable of measuring resistance over quite a wide range of values, but are rather inconvenient in use due to the reverse reading scale which is also non-linear..

This circuit is a bistable multivibrator, or flip-flop. Click on the "set" input at lower left to bring the output high (5V). Click on the "reset" input at lower right to bring the output low (ground). The transistors are cross-coupled in such a way that the....

A circuit that should be protected from high voltage. Is there any component other than a fuse that I don`t have to change every time Something like a switch that activates only when high voltage is supplied, diverts the flow and grounds it, and then closes.....

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In synchronizing the audio and the projected film, a tone code must be used. This tone code triggers a device which automatically changes the film or slide. To do this you need a two channel tape recorder. The normal audio program must be recorded in one....

Voltage-to-frequency converter (VFC)  circuit is shown in the schematic diagram below. The circuit employs 555 IC as the core of its function. This circuit....

It lights on the high-brightness LED even at 0. 8V if a battery can feed the circuit 93mA at 0. 8V. The step-up efficiency from 0. 8V to 1. 5V is 75% in average and the peak efficiency (83%) is located at a voltage around 1. 1V. The circuit consists of very....

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This webpage describes a highly efficient LED dimmer, or a dimmable LED flashlight, or a switching current source, or whatever you want to call it. Cheap, single-IC, uses commonly available parts, easy to build. Designed to get the longest light out of a....

A schematic diagram of the high-voltage power supply recommended for use with the power transformer. This power supply can also be used for other equipment with similar requirements.CAUTION: hazardous high voltages....

All miniature electronic devices operate off batteries. Some of them need higher than the standard battery voltages to operate efficiently. If the battery of that specific voltage is unavailable, we are forced to connect additional cells in series to step up....

This circuit is presented as an alternative to the IR beam break detector featured in the June 2009 issue (Silicon Chip). In order to make it relatively insensitive to ambient light, it uses a standard IR receiver IC such as the Jaycar ZD-1942. This has a....

A very interesting remote controlled alarm circuit using TSOP1736. Routing of an electric cable to attach a calling bell switch near the bed of an old age/...

This Application Note demonstrates a simple 8-direction digital compass application using Zilog`s Z8 Encore! ® MCU and an external sensor- compass hardware. Communication ports are pro- vided for the digital compass to receive commands and send status on the....

This page has links to various projects and items of interest for the RoboticsArt Studio class projects....

This article describes how to build a simple uC based delay circuit for photographic applications like drop or high speed photography. It can be used to control the trigger lag of cameras and flash units, generate a periodic trigger pulse or even control....

This is a simple video transmitter that can transmit as far as 50 meters. This video transmitter can be used with the camera or other video sources. You can view them on VHF channel analog TV. Supply voltage to the video transmitter can use 9V battery.....

This is a simple video transmitter that can transmit as far as 50 meters. This video transmitter can be used with the camera or other video sources. You can view them on VHF channel analog TV. Supply voltage to the video transmitter can use 9V battery.....

TL072 a low noise JFET input operational amplifier with features such as common-mode input voltage range, high slew rate, operation without latch up, compensated internal frequency, high input impedance at the JFET input stage, low noise, low total harmonic....

The FM modulator circuit (frequency modulation) is built with a Motorola MC1648P oscillator. Two varactors, Motorola MV-209 are used to frequency modulate the oscillator. The 5000 © potentiometer is used to bias the varactors for the best linearity. The....

For a 0- to 10-V input, this circuit produces sine-wave outputs of 1 Hz to 20 kHz, with better than 0. 2% linearity. Distortion is about 0. 4% and the sine-wave output frequency and amplitude settle instantaneously to a step-input change. To calibrate, apply....