If smoke is sensed, the detection rate is increased to verify an Alarm condition. Smoke detector with gas sensor TGS 813 – source The simple schematic diagram of a smoke detector presented here ...

Protect your home with confidence by learning how to properly wire a combination smoke and carbon monoxide detector. This ...

At the heart of this ultra simple smoke alarm is H21A1, which is a photo-interrupter module ... conduct to activate the rest of the circuit. When the darlington pair conducts, the gate voltage of SCR ...