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 Post subject: Crystal Earpiece
PostPosted: Dec Thu 15, 2016 11:59 pm 
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Joined: Mar Tue 11, 2014 2:54 am
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A very good "tool" to have on the bench is a crystal earpiece. It can be used to check where you lose a signal in the audio chain and does not load down the circuit. Just be sure to use a small value capacitor for isolation.


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 Post subject: Re: Crystal Earpiece
PostPosted: Dec Fri 16, 2016 9:19 am 
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A better tool would be an amplifier; a Transistor radio, with leads connected to ground, and through a cap to the VC wiper, can serve as a cheap audio signal tracer.

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 Post subject: Re: Crystal Earpiece
PostPosted: Dec Fri 16, 2016 2:39 pm 
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fifties wrote:
A better tool would be an amplifier; a Transistor radio, with leads connected to ground, and through a cap to the VC wiper, can serve as a cheap audio signal tracer.


I could also use a scope as a signal tracer, which I do have on my bench. The reason I posted this is because not everyone may have a spare tools or test equipment laying around, but the job could still be done with alternatives.


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 Post subject: Re: Crystal Earpiece
PostPosted: Dec Fri 16, 2016 3:58 pm 
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RCA and other manufacturers that published service handbooks for their receivers often recommended a battery and a pair of magnetic headphones. Depends what one is trying to measure as well as training the ear to a "defective" sound...

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