This simple power supply, which is equivalent to 2 AAA or AA batteries, was found in an Elektor from the 90's. The transformer has a 4.5 V secondary with a current of 50 mA or more.
We found this variable regulator circuit in a Radio Electronics issue from July 1984. It is one of...
This receiver for an audio link by modulated light was found in a 90s Elektor. Transistors are common...
The circuit shown in the figure is indicated for alternative energy sources, such as those...