SN16889 battery voltage indicator circuit design electronic project
This battery voltage indicator electronic project is designed using linear voltage indicator SN16889 (manufactured by Texas Instruments) or MC16889 (manufactured by Motorola). The circuit below allows lighting, depending on input voltage of one or more LEDs. Maximum voltage at which all LEDs light is adjusted using potentiometer P1 to 15 volts. D7 can be red LED indicates a battery voltage too high. D6 LED green indicates a correct value and the battery voltage LEDs D5, D4 and D3 yellow indicates a battery voltage too low.