Sound activation switch circuit diagram
Source: InternetPublisher:fish001 Keywords: Security aviation circuit sound activation switch circuit diagram Updated: 2020/09/07
as the picture shows. This circuit can be used as a sensor for a burglar alarm or can be used to turn on a listening tape recorder to record a conversation. Adjust R8 to achieve the desired sensitivity. LM339 is a four-comparator. The first part, A1, is used for amplification and detection, with a gain of 100; A2 compares the DC output of A1 with the reference level selected by R8, and its output can trigger Q1, generating a load current of 200mA, and Make the LED light up.
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