This circuit from the 90s, found in an Electronic Engineering can be used as a shield since its control is digital with TTL logic of 5 V. The components used are still common today.
Currents of a few tens of milliamps can be obtained with this simple source that makes use of an...
This circuit was obtained in a 1990 English magazine. The circuit can be assembled with equivalent power...
This circuit is recommended by Texas Instruments in the datasheet of the TL317, equivalent to...