This circuit was found in a Popular Electronics from the 90's. The transistors are general-purpose types and the loaded load depends on the voltage and must have a maximum current of 100 mA.
The selected circuit was found in the Texas Instruments optoelectronics manual. RC and C1...
This power supply circuit with selectable voltages was found in the June 1979 issue of Radio...
Found in a 1965 Electronic Design, this high voltage circuit uses period transistors. Its purpose...