24K views · 117 shares | Electricity failure alarm using micro controller and #ZCD: The #circuit given here gives audio-visual indication of electricity failure. It operates on battery. It uses 20 pin micro controller AT89C4051 and it gives audio alarm as well as LED indication whenever electricity fails. It uses ZCD (Zero cross detector) circuit to generate 50 Hz pulses out of 230 V AC mains. | EngineersGarage | Facebook
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24K views · 117 shares | Electricity failure alarm using micro controlle…
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