Wire Tracer (Receiver)


The circuit depicted is
the receiver device of a transmitter/receiver combination that will
prove extremely handy when tracing the path of electrical wiring in a
building or to locate a break in a wire. The corresponding transmitter
may be found elsewhere in this website. The transmitter produces a
distinctive tone which alternates between 2100 Hz and 2200 Hz. The
matching receiver for the wire tracer is possibly even simpler than the
transmitter, as is shown by the schematic. It consists of no more than a
short wire antenna (a piece of wire, 10 cm long is adequate), a
high-pass filter (C1-R1), an amplifier stage (IC1), an output stage (T1)
and a loudspeaker.

Wire Tracer Receiver

Wire Tracer Receiver

The prototype used a high impedance loudspeaker from a telephone
handset, and this worked remarkably well. The purpose of P1 is to adjust
the amplification. At the highest amplification, the wire energized by
the transmitter can be traced from several tens of centimeters away. A
direct electrical connection is therefore not required. However, it is
important that you hold the ground connection (earth) in your hand.


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