This circuit is from 1973 documentation. The transformer has 500 mA of current and the transistor can be the TIP32 mounted on a heat radiator.
This 6V regulator with FET was found in an old Electronic Design. FET and transistor admit modern...
This circuit was found in a publication of1994, originally obtained from the National...
This circuit automatically controls the degree of illumination. As the circuit is from 2001, it...