This circuit with current up to 100 mA according to the transformer was found in the Radio Electronics magazine of October 1991. The regulation is done directly by the zeners.
This circuit was found in a Popular Electronics of the 1990s. Its purpose is to expand the scale of...
This filter was obtained from Radio Electronics from the 80's. The configuration applies to any...
Found in an Electronic Design from 1965, this circuit makes use of transistors of the time. The...