This circuit with 1% regulation aims at replacing mercury cells. We found it in a 1967 documentation. Transistors can be replaced with modern equivalents.
12 V battery chargers provide higher unregulated voltage. With the regulator shown, obtained from...
This circuit consists of an inverter powered by only 4.5 V. The circuit is from a 1967 Mullard...
This circuit was found in an American documentation from 1969. The circuit memorizes when a...