This 2 Volt Battery Monitor by IC LM3914 circuit makes it possible to monitor the charging process to a higher level. Adjustsments end are simple and all you need is a digital voltmeter for the necessary precision. Connect an input voltage of 12.65 volt between the positive and negative poles and adjust the 10K potentiometer until the LED 10 lights up. Reduce tension and the sequence of all other LED lights. Control has been an enlightening about 11.89 volts.
At 12.65 volt and higher the battery is fully charged, and 11.89 is considered "empty". This circuit, with the components shown, uses less than 10 mA. Of course you can adapt this circuit for their own needs, making small modifications. The previous circuit is set to "point" mode, which means only one LED at a time goes on. To use the mode of "bar", then connect pin 9 to the positive supply rail, but obviously with increased current consumption. The brightness of the LEDs can be adjusted up or down by choosing a different value for the 4K7 resistor connected to pin 6 / 7.
At 12.65 volt and higher the battery is fully charged, and 11.89 is considered "empty". This circuit, with the components shown, uses less than 10 mA. Of course you can adapt this circuit for their own needs, making small modifications. The previous circuit is set to "point" mode, which means only one LED at a time goes on. To use the mode of "bar", then connect pin 9 to the positive supply rail, but obviously with increased current consumption. The brightness of the LEDs can be adjusted up or down by choosing a different value for the 4K7 resistor connected to pin 6 / 7.
