This simple low current circuit was found in a Radio Electronics magazine from August 1960. The circuit does not use transistors in regulation, but only zeners directly.
If the reader has an old MSX still working, it can be used as a microcontroller for your robotics...
This circuit was found in a 1993 Electronics Hobbyst Handbook. The circuit operates in the FM...
In the figure we have the way to simulate an SCR using two complementary general-purpose...