electricity testing pencil circuit

Published:2011/5/11 2:22:00 Author:Christina | Keyword: electricity, testing pencil | From:SeekIC

When you are testing the electricity, the weak current gets through the resistor and neon tube, and makes the neon tube toturn on, the current also makes the oscillation circuit (compose of the CMOS IC) to start oscillating, and makes the piezoelectric ceramic to send out voice.



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