Power outage alarm circuit 4
Source: InternetPublisher:D先生 Keywords: Alarm circuit switch indicator light control circuit Updated: 2020/04/17
It is actually a photoelectric control circuit . The phototransistor VT is installed in a place illuminated by the grid
power indicator light . The circuit uses two 555 time base integrated circuits, Ai is used as a switch and A2 is used as an audio oscillator
.
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