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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Low Frequency Relay C (CB21225E)
Found in American documentation from the 1990s, this circuit oscillates at a low frequency when a...
80W Transistor Amplifier (CB1367E )
This circuit was found in a 1973s Japanese publication. The power transistors used are of the era...
Strobe Light (CB17035E)
This strobe light circuit with xenon lamp was found in a 1995 documentation. The circuit is...