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Quote:
Somewhere in my older Zenith service lit is another circuit for a remote tester and an ultrasonic signal generator, 1969 or 1970.. The Brits published a magazine called "Television" that had service info - they also published a project for a tester, both IR and ultrasonic. This was in late 1987 or so. I bought the issue in London when I was visiting. It used the mic and diode as inputs to a Schmitt trigger, squaring up things. A frequency discriminator was used in the ultrasonic side, and a dual LED in the IR side. Same issue had info about checking the IR remote oscillators with an AM radio (most resonator/oscillators operated at either 455Khz or 500KHz...). ..
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Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! |
Audiokarma |
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