Bug Detector with Beep
Parts List:
R1 = 390 ohm, 5% R2 = 390 ohm, 5% C1 = 1000uF, 10V C2 = 1.5uF, 10V C3 = 3.9nF C4 = 20pF, trimmer C5 = 10nF (0.01uF or 103) IC = 7413 or 74LS13 (2)
Please note: This circuit is not open for discussion. Although working perfectly, it was experimental. I will answer no emails in regards to this circuit.
If you are looking for a more serious and reliable bug detector, go to the Countersurveillance Monitor article on the Circuits Page.

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Copyright © 1995, Tony van Roon