AC-DC & DC-DC Circuits

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Ir-Controlled Soldering Station
Absolute-Value Meter With Polarity Detector
Electronic Siren based NE555
Simple Lamp Dimmer Fan Regulator
Design of a kind of simple and practical telephone alarm system
ds18b20 using 1 wire
Modular Burglar Alarm
Mixing analog multiplier integrated circuit MC1496
Speech compression circuit diagram
Secret High Power Free Energy Circuit (AEC)