Free Energy Circuits

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Analogue Audio Level Meter (VU meter)
Transistor Checker with 555
Vocal Stripper Circuit
square wave oscillator circuit
Loudspeaker Protector Monitors Current
LEDs and resistors circuit
Circuit example of the LM381
A voice-activated lights control circuit
Light control relay circuit
555 the DC capacitor tester
Three-phase asynchronous motor PTC protection circuits



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