Surveillance Bug Circuits

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Touch Switch
RF probes
Impedance meter for Headphones
Active Antenna HF/VHF/UHF 3-3000MHz
50hz accurate oscillator circuit
Hakko 936 ceramic heater A1321
Lessons on Electric Circuits Experiments
An Add-On Current Limiter For Your Power Supply
Low power monostable circuit diagram
Electronic energy-saving lamp circuit 3



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