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LM3914 is an analog-controlled LED driver IC, launched by a national semiconductor in 1980. It can control 10 LED lights based on an analog input voltage. It is best to alternate microcontroller ic where 10 LEDs have to control so it reduces the hardware.
IC LM3914 can control 3V to 18V and the current for LED can be limited by simply using a single resistor on pin 7. This IC also has two operating modes BAR mode and DOT mode. You can also use more than one IC to control up to 100 LEDs. By using this IC the LEDs can be controlled without any flickering and flawlessly with equal brightness. Due to these good features, this IC is commonly used in visual alarms and other monitoring applications. In short, if you are looking for an IC to drive your bar LED lights then this IC might be of interest to you.
CD4511, MAX7219, and CD4054 can be used as an alternative of LM3914
In this circuit D1 to D10 LEDs displays the capacity of the battery dot bar display can also be used for indication instead of LEDs. External switch sw1 is used to select the mode, and sw1 is connected to the 9th pin of LM39-14-IC. The 6th and 7th pins are connected to the ground through an (R1) resistor. This resistor controls the brightness of LEDs. Resistor R3 and RV1 are formed a potential divider circuit. Here RV1 is used for calibration. There is no need for an external power supply to operate this circuit.
The circuit is designed to monitor the current 10V to 15V DC. The operating voltage of this IC-LM3914 is 3v to 25v DC, so this circuit will work even on 3v. The IC-LM3914 contains an adjustable reference and accurate 10-step divider. This IC-LM3914 can also act as a sequencer.
Some applications of electronics based on LM3914 are given below.