This circuit was found in a 1967 Electronics World. Transistor Q1 can be a TIP321 and Q2 can be a BC558. The indicator lamp is optional.
This circuit is very useful for the experimenter who may have his power supply damaged in the...
This circuit was found in a 1980s American documentation. Operational amplifiers are from that...
This circuit of a Popular Electronics is intended to control a wiper. The circuit consists of a...