Analog VU Meter circuits using transistors, 5 to 20 LED
LED VU meter using transistor is analog circuit to show level of power audio signal. You can build 5 LED to 20 LED display with PCB.
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September 18, 2018
Include: Volt meters :: Sound level meter :: Analog vu meter :: Soil moisture meter :: Digital meter circuit diagram :: Temperature measurements :: Electronic measurement tools :: Frequency meters :: Best battery tester :: Transistor tester project
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Simple Moisture Meter using 2N2222
This simple moisture meter circuit uses for level moistness temple of the earth. Fine the value R2 give Meter read the value has 1mA. When the moistness [...]
October 18, 2017
Simple solar plant watering alarm
This is simple Solar plant watering alarm circuit. It will sound alarms when the soil is dry. The trees have died. It the solar sell is 6V DC power supply
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VHF Dip Meter circuit
The frequency meter by use the LC resonance circuit that adjustable until the frequency show peak amplitude.
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Simple 555 IC Tester Circuit Diagram
Normal multimeter cannot check it. This circuit can help you.
July 3, 2017