This power supply is based on the 723 integrated circuit, which is no longer very common today. The transistor must have a heatsink and the bridge can be formed by diodes 1N4002 or equivalent.
This circuit is from a 2000 publication with the purpose of protecting a three-phase circuit by...
This circuit indicates the logical level of a CMOS circuit, extracting the power from the circuit...
The circuit shown in the figure is in fact an excellent symmetrical switching source capable of...