This circuit is from a Radio Electronics from August 1992. The transistor used allows the control of motors up to about 5 A. It must be equipped with a heat sink.
Equivalent transistors can be used on this 80's circuit. Any general purpose PNP transistor can work...
This circuit indicates when a 28 V lamp burns, lighting a neon lamp with higher voltage. The...
This setting appears other times in this section from other sources. This is from an 80's American...