This circuit, with 1 A output, was found in a 1975 documentation. The transistors admit equivalents and the transformer has windings according to the voltages being worked.
We found this circuit in an American 1980s documentation. Transistors may be general purpose...
This interesting circuit was obtained from a Poptronics of February 2001. The American magazine no...
We found this circuit in a technical documentation from National Semiconductor. The lamp up to 50...