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Create continuity tester circuit with buzzer and LED
Posted inMeters & Detectors

Continuity tester circuit with Buzzer and LED

Create continuity tester circuit with buzzer and LED for check solder joint defects, not kill components on PCB, as probe gives tiny current and voltage.
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LED VU meter transistor
Posted inMeters & Detectors

LED VU Meter circuits using transistors, 5 to 20, 40 LED

See LED VU meter using transistor is analog circuit to show the level of power audio signal. You can build 5 LED to 20 LED display with PCB.
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Simple Light Detector Alarm
Posted inMeters & Detectors Sound Generator

Simple Light Detector Alarm with solar sensor

This is Simple Solar light alarm circuit with the special edition, that improve this circuit whole new to higher efficiency. use solar cell instead of LDR
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salinity tester meter circuit
Posted inMeters & Detectors

Food & Water Salinity Tester Meter circuit

SEE a simple salinometer or salinity tester in food and water. Good for health. Using LM324 and few parts and LED display easily use, with 9V batts
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555 Polarity Car Electrical Probe tester circuit
Posted inMeters & Detectors 555 Timer

3 idea Polarity & Car Electrical Probe tester circuit

See 3 ideas of 555 DC polarity probe tester circuit. Check Car Electrical in easy, find open circuit, automotive short circuit, loose connection. Learn more
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