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Analog to Digital Converters (AD) – Circuit Schematic
Analog to Digital Converters (AD)
This type of converter is used to convert analog voltage to its corresponding digital output. The function of the analog to digital converter is exactly opposit...
Sound Pressure Level Meter – Circuit Schematic
Sound Pressure Level Meter
This project was requested by some correspondents wishing to setup their home-cinema set adjusting all the loudspeaker outputs to the same level when heard from...
1 KW Power (Watt) Meter – Circuit Schematic
1 KW Power (Watt) Meter
This watt-meter circuit has measurement range up to 1-KW. This circuit can give the complete (X)(Y) function although uses only one transistor. Actually, this c...
AC Current Monitors – Circuit Schematic
AC Current Monitors
This circuit was designed on request, to remotely monitor when a couple of electric heaters have been left on. Its sensor must be placed in contact with the fee...
Self-powered Fast Battery-Testers – Circuit Schematic
Self-powered Fast Battery-Testers
This circuit runs a fast battery test without the need of power supply or expensive moving-coil voltmeters. It has two ranges: when SW1 is set as shown in the c...
Signal Tracer and Injectors – Circuit Schematic
Signal Tracer and Injectors
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Zener Diode Testers – Circuit Schematic
Zener Diode Testers
Using a single 555 Timer IC and a small transformer to generate a high voltage, this circuit will test zener diodes of voltage ratings up to 50VDC. The 555timer...
Multi Wire Cable Tester – Circuit Schematic
Multi Wire Cable Tester
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Electromagnetic Field Probe with Meter Outputs – Circuit Schematic
Electromagnetic Field Probe with Meter Outputs
This tester is designed to locate stray electromagnetic (EM) fields. It will easily detect both audio and RF signals up to frequencies of around 100kHz. Note, h...
Digital Remote Thermometers – Circuit Schematic
Digital Remote Thermometers
This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage propor...
Digital Radar Speedometers – Circuit Schematic
Digital Radar Speedometers
This circuit is a Digital Radar Speedometer. It allows us to evaluate the speed of any object moving, especially cars and other vehicles. The speed is calculate...
Oscilloscope testing module (huntron circuit)s – Circuit Schematic
Oscilloscope testing module (huntron circuit)s
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Crystal Testers – Circuit Schematic
Crystal Testers
This circuit enables you to test quartz resonators at the range values from 32kHz to 24MHz. Confirmation of good state of quartz resonator is done by diode sign...
Mosfet TESTERs – Circuit Schematic
Mosfet TESTERs
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Led display digital Voltmeters – Circuit Schematic
Led display digital Voltmeters
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Transistor Testers – Circuit Schematic
Transistor Testers
This simple circuit has helped me out on many occasions. It is able to check transistors, in the circuit, down to 40 ohms across the collector-base or base-emit...
Digital Voltmeters – Circuit Schematic
Digital Voltmeters
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Linear Resistance Meter – Circuit Schematic
Linear Resistance Meter
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Continuity Testers – Circuit Schematic
Continuity Testers
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Digital Step-Km Counters – Circuit Schematic
Digital Step-Km Counters
This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants` pocket and the display is conceived in the follow...