Delay alarm circuit
Source: InternetPublisher:石榴姐 Keywords: Alarm circuit BSP relay contact Updated: 2021/05/15
It is a monostable circuit composed of two sets of 555 time base integrated circuits Ai and A2.
When the trigger switch S (which can be a reed switch contact , a relay contact , etc.) is closed artificially, the relay KA will close,
which is an alarm. After a period of delay, the circuit returns to the alarm state.
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