Telephone Surveilance Bug Circuits

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Loop antenna for 187 KHz
LED Battery Checkers
Stereo PLL FM transmitter
Signal Generator 20KHz
Field-programmable Operational Transresistance Amplifier using Floating-gate MOSFETs
ve170 monitor repair with led
Battery Tester Circuit Schematic
Magnetic Phono Cartridges Transistor RIAA Preamp



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