Delayed voice anti-theft alarm circuit
Source: InternetPublisher:containsmachine Keywords: Anti-theft alarm alarm circuit BSP LED Updated: 2021/04/07
Circuit working principle: This circuit consists of three parts: monostable trigger circuit, voice alarm generating circuit
and audio power amplifier circuit. The monostable trigger is composed of IC1 (NE555)
. Normally, the permanent magnet ZT is close to the reed switch AG. At this time,
the reed in AG is connected, causing pin 2 of lC1 to be in a high level state, and pin 3 of lC1 to output a low level
, so the alarm indicator LED does not light up. Subsequent circuits also don't work.
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