Scratch filter (CB22152E)

This filter for scratched disc noise was found in an English documentation from 1989. The integrated circuits used are still common today.

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Precision clock oscillator (CB9648E)
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Vocal Filter (CB25355E)
We found this circuit for vocal effects in the September 1990 issue of Radio Electronics magazine. The...
Transistor voltmeter (CB20582E)
This is a voltmeter with high input resistance. The transistor is germanium. We found it in an...