Nuclear physic applied in smoke detectors

Robert Gawron writes: Not many people know, but in some smoke detectors, radioactive materials play an essential role. Today I will present one of those devices, and my -successful- attempt to reverse engineer it and get the circuit diagram. Those smoke detectors uses a small amount of Americium-241 (chemical symbol: Am) obtained in nuclear reactors […]

Microchip’s RE46C190 programmable photoelectric smoke-detector IC

Microchip has announced that its RE46C190 smoke detector IC has received UL certification. According to the datasheet: The RE46C190 is a low power, low voltage CMOS photoelectric type smoke detector IC. With minimal external components, this circuit will provide all the required features for a photoelectric-type smoke detector. The design incorporates a gain-selectable photo amplifier […]