This circuit is based on an operational window comparator. We found it in a documentation from the 90s. It can be used with power supplies and batteries from 5 to 16 V and the adjustment of monitoring voltages is done in trimpots.

This circuit is based on an operational window comparator. We found it in a documentation from the 90s. It can be used with power supplies and batteries from 5 to 16 V and the adjustment of monitoring voltages is done in trimpots.