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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Push Pull Output Amplifier (CB950E)
This old configuration of an audio amplifier has a push-pull two-transistor output stage. Output...
Astable Multivibrator (MSB016E)
This is the traditional configuration of na Astable Multivibrator using two NPN ttransistor....
Economic Ammeter (CB16606E)
This circuit is from 1987 documentation. The operating system used is not common today, but two...