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Signal Tracer For Audio Fault Finding - sound-au.com
https://www.sound-au.com/project164.htm
Signal tracing is a way to diagnose where a fault lies in an audio system. It's nowhere near as good as an oscilloscope, but it's a cheap alternative that can be useful in many cases. The idea is that you apply a signal to the input of whatever isn't working, and trace the signal through the circuit until the audio disappears.
Signal Tracing - ChildhoodRadio
https://childhoodradio.com/signal-tracing/
Signal tracers are simply audio amplifiers and speakers with test leads that let you locate and hear signals in the various radio stages. They also have a diode used to detect and convert RF signals from the "front end" and IF sections of the set into audio that you can hear through the tracer's speaker. SIGNAL GENERATOR
Signal Tracer Project - Rob's Radio-Active
https://www.robsradioactive.com/signal-tracer-project.html
The signal tracer works in much the same way with audio probe, except that an audio signal requires no detection, and usually does not require as much amplification, so it is fed to the volume potentiometer to the LM386.
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Basics of Signal Tracing - Rob's Radio-Active
https://www.robsradioactive.com/basics-of-signal-tracing
Essentially, the common signal tracer design such as this EICO 147 is just a high gain audio amplifier with an input for audio signals through a pair of straight wire probes. For "listening in" on the radio frequency signals, there is provided a demodulator probe with a shielded cable that connects to the RF input.
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