Suggested by a 90s Radio Elecrtronics, this circuit is intended to supply mobile equipment of the time. The transformer data is given next to the diagram.
This circuit was discovered in an English publication in 1979. The circuit can still be assembled with...
With this circuit it is possible to obtain a voltage of -5 V from a 5 V source. The circuit is...
This simple experimental circuit using only transistor produces a tone given by C1 and C2. Tone is...