Ticket room closing reminder circuit
Source: InternetPublisher:张三叔 Keywords: reminder trigger Updated: 2020/10/15
Circuit working principle: The circuit is composed of the "please close the door" voice integrated circuit
HFC5203A and the audio power amplifier integrated circuit LM386N. A simple
magnetic switch is used to control the circuit . SW of IC 1 is the trigger terminal. Normally when the door is closed
, since the permanent magnet ZT is in close contact with the reed switch AG, the magnetic force of ZT causes
the two reeds in AG to be disconnected, so the SW terminal of IC1 has no trigger level, and IC 1 does not
work. Voice is emitted.
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