This amplifier was found in a 1970s documentation. Darlington transistors can be replaced for modern equivalents of at least 80 V x 2 A, equipped with good heat sinks.
This simple timer based on unijunction and SCR transistors is from 1995 documentation. The maximum...
A non-sinusoidal 120 V voltage can be obtained with this circuit found in the December 1992 Radio...
This circuit uses an LM339 and was found in the July 1995 Electronics Now magazine. The LED lights...