I am using a 3V battery to light 2 LEDs that have a forward voltage of 2.7 V and a third led with a 2.4V forward voltage that acts as an indicator to tell the user the power is currently on.
All 3 LEDs are in parallel. The circuit is currently drawing 9ma and is only on for 5 seconds when used, which is maybe 3 times a day.
I am looking for a circuit diagram to make the indicator LED flash when the battery voltage drops below 2.7 volts, otherwise it stays on when the other unit it is turned on, so when a user turns it on and it is flashing the user knows to change the battery.
I understand that these low voltages are a problem to get working. Any and all ideas would be greatly appreciated.