Telephone Surveilance Bug Circuits

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845 20W A1 class monotriode amplifier
Radio Wave Alarm
Direct Injection Box for Recording & PA
Networking Security System (ATmega16L)
Electronic phone bell
Two-stage wideband amplifier
One-Way Voice-Activated Intercom Circuit
Charging a low-voltage high-C capacitor. Efficiently
120 vac lamp dimmer
SPI Interface Big 7-Seg LED
Electronic Door Release
SH-805 ASIC holiday lights
Car or room timer alarm circuit diagram
A feedback circuit and the differential input stage bias circuit is provided separately