When the battery voltage is above 5.1 volt, zener provides regulated 5.1 volt to pin3 of IC and its output goes high to light LED. It indicates that battery is full. If the voltage in the battery ...

A Simple Low-Battery Indicator Circuit Oct. 8, 2008 The following circuit uses a low-power CMOS comparator and an LED to indicate low-battery voltage without causing excessive current drain.

Low-battery indicator uses fleapower; Automatic latch-off circuit saves batteries; Circuit protects battery from overdischarge . Tags Analog. Advertisement. 5 comments on “ Simple circuit indicates a ...

One problem which proved difficult to solve was how to provide a low battery indicator. ... He discovered that the HP-25’s internal low battery circuit was triggered by a voltage of 2.1 volts or ...

A recent project required an inexpensive microprocessor that could be battery operated and indicate if the batteries were low. I chose Microchip's PIC16LF84A for the microprocessor ...