This circuit is from 70's documentation. The converter used is not a common component today.
In the original version of this 1987 circuit, the loads are lamps, but it can be adapted to drive a...
This circuit is suggested by Motorola, using a 4N26 type coupler and an MC1733 type operative. However,...
This TTL oscillator uses an old TV crystal, having been found in an American publication in 1976....