Intercom Circuits

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Inductance adapter for frequency meter
15 x 7 LED display with PIC16F628
2x300W or 600W Power audio Amplifier
Flood-alarm-or-temperature-monitor
4 x 25 W Car Amplifier TDA7381 Circuit
Solar Cell Voltage Regulator
Simple Police Siren US-Style
H-Bridge Transistor Smoking (Bipolar BJT Transistor)
Door Bell Circuit Using BEL 188 PCB
NE568 NE568A;SA568A 150MHz Phase-locked Loop
Audio Speaker Crossover Circuit
Infrared Remote Tester
4-Channel Thermocouple Input Arduino(TM) compatible Shields and Boards
Alarm and Security Circuits



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