Air-Gas Detection Circuits

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Locked Loop Synchronous Demodulator
Speech activity detector for telephone lines
Guitar treble boost
Plug-in speed control for tools or appliances
Wien-Bridge Oscillator
Phototransistor for High Impedance Voltmeter
full bridge inverter with mosfet ir2110
phone cut circuit
phone record circuit
Phase Locked Loop (PLL) Oscillator Circuit 860 MHz
Old G.P.O. Telephone
FM Broadcasting
Inverter air conditioner current detection circuit
Random password keyboard circuit



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