This power supply with only 4 components has basic full-wave configuration. The diodes depend on the current and the transformer voltage determines the output voltage.
Found in Popular Electronics from the 90s, this circuit uses a 2N2646 and a general-purpose transistor...
The crystal frequency of this circuit found in an American documentation is limited only by the...
These two circuits were found in Radio Electronics magazine from February 1960. The transistor is a power...