BUG_TRACER

Published:2009/7/8 4:06:00 Author:May | From:SeekIC

The bug tracer is made up of a simple rf-injector circuit consisting of Q1 and Q2, and a pocketsize, AM broadcast receiver. The two-transistor rf-injector circuit supplies a constant rf signal to one end of a cable. Then the AM receiver is used as a detector, allowing you to trace the wire to its source. Transistor Q1, along with piezoelectric ceranuc resonator RES1, make up a simple rf oscillator that operates either at or near the AM-radio, 455-kHz, i-f frequency. That means that the second or third harmonic signal can easily be picked up by the receiver. Transistor Q2 is connected to an emitter-follower circuit to protect the oscillator from output loading; that helps to stabilize the output frequency and signal level.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/BUG_TRACER.html

Print this Page | Comments | Reading(3)