Two-tube regenerative receiver (T1595E)

This circuit is from a Radio Electronics from 1949. The circuit is battery powered and has high impedance listening.

Darlington Power Switch (CB993E)
This circuit was found in an old publication about transistors. The circuit can be used to drive...
Photo Inverter Control For Motors (CB4320E)
Using a symmetrical source this circuit reverses the rotation of a small motor through light...
Circuit Breaker with the LTC4213 (CB5900E)
This circuit was found in a 2005 Linear Technology documentation. The circuit is based on LTC4213...