20 to 20 kHz generator (CB9240E)

This rectangular signal generator was found in an Electronics World of 1966. The transistors are from that time and modern equivalents can be tested.

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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)
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