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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50 kHz optical receiver (CB20690E)
This circuit for light modulated in frequency (FM) was found in documentation of the 90s. SUS is...
Astable with Operational II (CB14061E)
This traditional circuit is from a 1972 RCA technical publication. The circuit can be developed with...
Telegraph Practice Oscillator (CB4890E)
This traditional oscillator circuit that can be found elsewhere in this section uses general...