Multiplexed AD Converter (CB9023E)

This 8-channel converter was found in a 1970s American documentation. The integrated circuits used are not common today.

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Microphone Preamplifier (CB23956E)
We found this circuit with JFETs in a Radio Electronics magazine from June 1969. The circuit has...
Frequency divider (CB7969E)
Indicated for frequency measurements, this circuit can operate with inputs up to 1 MHz. We found...
741 200 mW Amplifier (CB25291E)
This general-purpose transistor audio amplifier was found in the March 1990 issue of Radio...