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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Driver for piezoelectric motor (CB7998E)
Found in an Electronic Design from the 90s, this circuit uses high voltage operationals of the...
Digital Oil Pressure Gauge (CB25336E)
This circuit was found in the July 1990 Radio Electronics magazine. It is based on the 3-digit...
Operational VCO (CB13131E)
The circuit shown in the figure uses two of the four operational amplifiers found on the LM324...