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One of the inductive high voltage alarm circuits
Source: InternetPublisher:张小哥 Keywords: Alarm circuit high voltage inductive BSP Updated: 2021/01/18
An astable self-excited multivibrator is composed of 555 time base integrated circuit A and so on.
When the induction is extremely close to a high-voltage charged object, the piezoelectric ceramic piece B will sound
an alarm. When it is close to the power frequency electric field, it emits a cricket trill;
when it is close to the electrostatic field, it emits a straight sound like an electric flute.
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