The circuit diagram below shows the complete circuit.
LOW BATTERY INDICATOR CIRCUIT DIAGRAM PRO
If the voltage is lowwer than 9V, the zener must be replaced with smaller voltage zener and current-limiting resistor also replaced with smaller current-limiting resistor. 0 I have designed a circuit that uses this low-battery-indicator: I use 4xAA Lithium batteries to drive an Arduino Pro Mini, some LEDs, a buzzer and a solenoid. The LED will light to indicate low-battery condition when the op amp’s output becomes low due to the voltage at the tap of the potentiometer drops below the voltage set by zener. 1 Hello, I can find a lot 12 volts battery protection circuits to protect against both over charging and over discharging. Here is the schematic diagram of the circuit: The op-amp will compare the voltage between two inputs, one supplied with a voltage from a high resistance linear potentiometer which act as voltage divider, and the other is the voltage from zener reference.
This circuit utilize zener diodes as a voltage reference and 741 op amp as voltage comparator to detect if the voltage falls below a preset value. This battery indicator circuit will indicate the low battery condition by flashing the LED. A low-battery indicator circuit is shown in the schematic diagram. This is a very simple 9V low battery indicator circuit which has 2 LEDs, one green which will light up when the battery voltage is higher than 6.
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