@▷ Wireless Bug detector | Diagram for Schematic

Wireless Bug detector

This fairly simple circuit makes it possible to place such a wall as a conduit to locate. It is a conduit for power, no water or gas-seeker. The only requirement is that there is tension on the line. The antenna in the table can consist of a simple piece of copper wire. The correct adjustment is done through R7, in order to prevent the buzzer and LEDs still light up even though there is no leadership in the area. ..
Source: http://www.circuitsonline.net/schakelingen/113/meten-en-testen/leidingzoeker.html

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detector, alarm systems