This circuit is from an old Japanese publication of 1962. The circuit uses two batteries, one for the filaments of the tubes and the other one of high voltage for the plate circuits.
This 1.5 A circuit is from the LM117 manual. The LM350 can be used for higher current, and the...
Using a CA3130 and a power transistor, this circuit can deliver a current of up to 500 mA with the...
This circuit was found in RCA and General Electric documentation from the 1980s. The circuit has...