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Inductive electric test pen circuit three

Source: InternetPublisher:闪电杰克 Keywords: Inductive oscillation frequency Updated: 2020/03/15

103.<strong>Inductive</strong> Electric Test Pen<strong>Circuit</strong> Part 3.gif

It has sound and light alarm function.
Adjusting the capacity of capacitor C can change the oscillation frequency , that is, change the tone of the alarm sound.

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