Power Failure And Resumption Alarm Cum Indicator Circuit Board Ready-made Kit For Electronics Projects
Circuit using 555 timer ic. This is a simple ac power supply failure alarm circuit diagram.
Apart from alarm for power failure and resumption, it gives a short beep during power fluctuations.
The transformer has two terminals on primary and secondary. If you do not know to differentiate between the primary and secondary, please follow the method mentioned below:
- Take a multimeter
- Rotate the switch to audio continuity mode
- Connect the probe to the two terminals. If you hear a sound, then it is the secondary. The other two terminals which has high resistance is the primary.