Found in documentation from the 1980s, this circuit uses an operational amplifier from that time. Transistors are also from the era, and general-purpose equivalents can now be used.
What differentiates the CIR8139 circuit is the use of two inverter ports to trigger the transistor that...
The battery charger suggested in the figure has its current limited by resistor R1. This component may...
This circuit with increased power output was found in the November 1974 Radio Electronics...