The phototransistor of this alarm can be of any type. The relay must be sensitive type according to the power supply used. The circuit is from an old American documentation
555 Alarm (CB4880E)
- Details
- Written by: Newton C. Braga
The phototransistor of this alarm can be of any type. The relay must be sensitive type according to the power supply used. The circuit is from an old American documentation
