This is a very useful autotransformer circuit on the bench. We found it in the September 1970 Radio Elecronics magazine. The transformer must be according to what you want to feed at the output.
This simple receiver, which requires a good antenna and grounding, was found in an Argentine...
In the figure we have a typical relaxation oscillator with a SIDAC as well as waveforms and...
The circuit shown is from the November 1996 Electronics Now magazine. The basic circuit is in the...