Found in a 90s 73 magazine for radio amateurs, this circuit makes use of common operational amplifiers.
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...