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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1-quadrant logarithmic converter (CB7333E)
This temperature compensated circuit was found in a Popular Electronics from the 90s. Integrated...
Car Alarm (CB6773E)
Found in a Popular Electronics from the 90s, this circuit uses components that are still current....
RF switch using diodes (CB9225E)
This circuit can switch signals in the 3.5 to 30 MHz band. We found it in a QST magazine from the...