Car Alarm (CB8925E)

This circuit was found in a 80’s Popular Electronics. The components are common and the 8-ohm speaker.

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3 and a half digit LCD converter (CB4912E)
The component used in this circuit is not very common today as the circuit is from the 80's. It...
Bootstraped Source Follower (CB6156E)
This configuration was found in an English magazine from 1965. It is valid for any junction FET. The...
Square root extractor (CB7804E)
In this interesting circuit from Popular Electronics, the output voltage is the square root of the...