This circuit is for 12 V batteries but can be used with batteries of other voltages by changing the zener diode. The trigger point is adjusted by R1. The operating system accepts equivalents.
This circuit, which may have appeared elsewhere on this site, is from the integrated...
We found this circuit in a 90s Radio Electronics. The circuit uses a transconductance operational...
This circuit was obtained from an 80's documentation from General Electric. The circuit uses an...