Telephone Surveilance Bug Circuits

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Tiny pH-meter
Square·-to-sine-wave-converter
Sine-square-wave-oscillator
Light Sequencer Circuit
Specific color sensing circuit
Remote-Controlled Fan Regulator
Energy-Saving Switch Schematic
Analog 5Gb/s Clock-and-Data Recovery Circuit
Simple DC motor PWM speed control
Micro Power Transmitting Station
Serial - parallel conversion circuit



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