Air-Gas Detection Circuits

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Random timer circuit using a Attiny24A
Transmitting audio over laser or LED
Logic gate using current source and diodes
uhf tv pre amplifier
circuit 10a variable power supply symmetric
Simple Audio Amplifier Circuit Using LM386 PCB
Servo controlling circuit
Home Automation through Cellphone Keying
Four channels infrared remote controller circuit diagram
LF356 composed of AD converter