We found this circuit in a Popular Electronics from the 90s. Transistors can be modern equivalents. Observe the high supply voltage.
This is an old 1988 circuit consisting of a timer or time control for exposing silk-screen arrays. The...
This circuit was found in a 90s Silicon Chip documentation. The current of the transformer is 1 A maximum,...
This circuit with output powers of 2 to 3 W depending on the power supply was found in the...