Found in a radio amateur magazine of the 1980s, this circuit uses components that can still be found easily. The circuit is for NiCad batteries.
This circuit from Delta Products was published in the May 1974 Radio Electronics magazine. The...
This circuit that uses only transistors that are still common was found in a 1995 documentation. The TIP41...
This new Texas Instruments component consists of an inductive proximity detector that can be used...