Audio amplifier 741 (CB20478E)

This low power audio amplifier was found at 1992s Popular Electronics. Transistors are general purpose common types.

Touch Alarm (CB6450E)
Found on Popular Electronics from 1969, this circuit can be implemented with components that are...
Triangle to sinusoidal converter XR2208 (CB24549E)
This circuit for frequencies up to a few tens of megahertz was found in the April 1978 issue of...
OR gate with the LM3900 (CB4032E)
The circuit presented emulates an OR gate with the LM3900, operational transconductance amplifier....