Like the first two Hijack Alarms - if a door is opened while the ignition is switched on - the circuit will trip. And after a few minutes delay - when the thief is at a safe distance - the Siren will sound. But this time the engine does not go on to fail....

This logic probe uses a single CMOS IC and shows three logic conditions, High, Low and Pulsing. In addition if the probe input is neither hi or low (the high impedance state of tri-output logic ic`s) then no LED`s will light. Power from the logic probe is....

This circuit will allow you to turn on any piece of equipment that operates on 115 volts ac. The reciever circuit is based on the Radio Shack infrared receiver module(MOD), part number 276-137. It is also available from some of the other sources listed on my....

Switchable Output Crystal Oscillator Circuit This oscillator circuit permits crystals to be electronically switched by logic commands. The circuit is best understood by initially ignoring all crystals. Furthermore, assume that a....

Any number of normally-open switches may be used. Fit "tilt" switches that close when the steering is moved or when the bike is lifted off its side-stand or pushed forward off its centre-stand. Use micro-switches to protect removable panels and the lids of....

This circuit is simple. The first 555 timer prevents the second timer from being triggered while the first is running...

A circuit that lets you operate your home appliances like lights and water pump from your office or any other remote place. So if you forgot to switch off the lights or other appliances while going out, it helps you to turn off the appliance with your....

Here is the circuit diagram of IC Controlled Emergancy Light With Charger or simply 12V to 220V AC inverter circuit. The circuit shown here is that of the IC controlled emergency light. Its main features are: automatic switching-on of the light on mains....

To check the peak voltage of the signal to change at any time. Measuring with a multimeter will not do it. We recommend this circuit. It may help you. In this circuit is used with a positive signal input, when has negative feedback only. And the inverting....

A simple F to V converter circuit with diagram and schematic using LM555 Timer IC.This circuit has lots of applications in digital frequency meters, tachometers etc....

The graphic equalizer circuit the frequency adjust circuit. For some kinds of audio frequency response is not smooth. The....

This circuit shows an ICM7217 and an ICM7555 that are connected as a basic frequency counter. The connections between the ICM7217 and a common-cathode LED display are shown in Fig. 12-18. The frequency counter is calibrated (against a known standard) using....

12 Volts Lead Acid Battery Charger Circuit Except for use as a normal Batter Charger, this circuit is perfect to ‘constant-charge a 12-Volt Lea....

The TBA120 Series ICs provide a high-gain limiting IF amplifier and a quadrature coincidence detector in one package. These ICs are primarily intended for extraction of TV intercarrier sound, which (in Europe) is frequency modulated onto a 5. 5MHz or 6MHz....

This circuit will be particularly useful to those hobbyists who use a breadboard` to try out ideas and who also use a simple home-made` DC power supply consisting of a transformer, rectifier, smoothing capacitor and protective fuse, that is, one without over....

Solar Cells Light-Sound Converter. This is experimental circuit that converts light into sound....

For the shorter wavelength VHF and UHF bands it`s more practical to construct more complex antennas such as a single band Slim Jim or Yagis; I`ve had a go at a few such projects. Other projects will be an electronic unit of some kind: For the Intermediate....

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This is a FM Transmitter circuit. This circuit uses logic gates. This transmitter circuit has a RF oscillator. This oscillator uses 10.7Mhz ceramic filter and...

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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:....

A very simple low power AM FM radio receiver electronic projects can be designed using the TA8122 integrated AM FM receiver, manufactured by Toshiba Semiconductor. This radio receiver circuit can be used for portable radio applications or other similar....

Here is a hobby circuit of a multi channel remote control system, by which you can control 8 different appliances. The main sections of this multi channel remote control circuit are the RF receiver and transmitter. By using this circuit we can control 8....

This article is in the "you can do it too" category. It`s not as difficult as you can imagine for the average model railroader, especially with the information available on the Internet and with articles like this to guide you. I have been looking for a way....

The following circuit shows a timer circuit with independent mark and space periods. This circuit based on the 7555 IC. Features: output high is calculated by T(on) = 0. 7 Ra Ct, output low is calculated by T(off) = 0. 7 Rb Ct, astable timer, (on) and (off)....

In this project, we will build a relay driver for both DC and AC relays. Since DC and AC voltages operate differently, to build relay drivers for them requires slightly different setup. We will also go over a generic relay driver which can operate from....

before proceeding to this steps make sure that you already done software calibration and the basic steps on how to check audio circuit components which I already explained here: I also preferred the audio circuit schematic diagram, for easy tracking, by....

An audible field strength indicator (AFSI) lets you listen to changes in radio signal strength so that you can use your eyes to look for concealed antennas. Using inexpensive, easy-to-obtain parts, the following design combines a sensitive amplified field....

Switch applies positive pulse to gate of scs, triggering it on and thereby supplying power to relay load and ujt timing circuit. At end of timing interval, determined by R-C, timer feeds negative pulse to anode to turn off scs. -"Transistor Manual, " Seventh....

Triangular wave generator using opamp. Circuit diagram theory and working. Integrating square wave produces a triangular wave. Practical circuit diagram of triangular wave generator....

The herein schematic diagrams TPS61042 Current LED driver powering 8 LEDs with 81% efficiency at 3.6V/18.6mA. TPS61042 used to be applied in applications such White LED Supply for Backlight/Sidelight Displays (PDA, Pocket PC, Smart phones, etc)..

Introduction The design of off-line constant voltage, constant current (CVCC) power supplies NCP1014 for cell phone, hand tool, and similar Battery Chargers CAN present several challenges if low cost and circuit simplicity are necessary, yet good performance....