Two-input amplifier (CB21661E)

The critical component of this 1967 amplifier is the driver transformer. The circuit has both high and low impedance input.

Nicad Charger (CB13544E)
This circuit is intended for charging 12 V Nicad batteries, which corresponds to 10 common...
Discharger limiter for Nicad (CB9546E)
This circuit for discharging NiCad batteries limits the current to a value that can be adjusted in the...
Variable voltage regulator (CB21192E)
This current-limited circuit was found in a Popular Electronics from the 90's. ...