Tracer-receiver


Posted on Nov 15, 2012

The tracer receiver is a stereo audio amplifier/detector circuit operating near 1 kHz. Inductors Ll and 12-hand-wound coils, consisting of 200 turns of #26 wire on 2-inch ferrite cores-are tunea to the operating frequency of the amplifier/detector. The received signal strength of each individual receiver is indicated by an LED. The audio output of the receiver is fed to a stereo headphone. That dual-receiver scheme helps in locating and tracking the hidden wire or cable by giving a directional output that indicates the cable`s path.


Tracer-receiver
Click here to download the full size of the above Circuit.

The 1-kHz signal is picked up by Ll and coupled to the input of op amp Ula, which provides a gain of about 100 dB. The output of op amp Ula is fed through volume-control potentiometer R7 to the input of Ulb, which magnifies the already amplified :;ignallOO times more. That puts the maximum gain of the receiver at about 10,000 dB. The output of Ulb follows two paths: in the first path, the signal is couple through C9 and Rl3 to Jl, and is used to drive one half of a stereo headphone. In the other path, the signal is fed through a voltage doubling/detector circuit-consisting of Dl, D2, Cll, and Cl3-that converts the amplified 1-kHz signal to the de voltage that"s used to drive Ql. When Ql is turned on, LEDllights, indicating a received signal.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Tiny Tuned Loop Antennas
2 LED flasher with two 2N3904 transistors
Microphone Preamplifier BC547B
Square wave generator III
Optical communication system
Slide Projector Auto Advance
5 band graphic equalizer using LA3600
Mini audio amplifier circuit
using doorbell circuit control things radio control
Strobo controller
OP AMP BASED MONOSTABLE MULTIVIBRATOR 741
Pull transistor relay delay circuit diagrams



Top