Bug Detector with Beep

Parts List
R1 = 390 ohm, 5%
R2 = 390 ohm, 5%
C1 = 1000uF, 6V
C2 = 1.5uF, 6V
C3 = 3.9nF
C4 = 20pF, trimmer
C5 = 10nF (0.01uF)
IC = SN7413 or SN74LS13 (2)

Please note: This circuit is not open for discussion. Although working perfectly, it was experimental. I will answer no email in regards to this circuit.
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Copyright © Tony van Roon, CET