LM3914N-1/NOPB datasheet by Texas Instruments

LM3914N-1/NOPB Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for the LM3914N-1/NOPB?
  The recommended operating voltage range for the LM3914N-1/NOPB is 3V to 25V.
• How do I choose the correct resistor values for the LED current limiting resistors?
  The resistor values can be calculated using the formula: R = (Vcc - Vf) / If, where Vcc is the supply voltage, Vf is the forward voltage drop of the LED, and If is the desired LED current.
• What is the purpose of the REF OUT pin, and how do I use it?
  The REF OUT pin provides a buffered output of the internal voltage reference, which can be used as a reference voltage for other circuits. It can be used to drive an external voltage-controlled oscillator or as a reference for an analog-to-digital converter.
• How do I adjust the brightness of the LEDs?
  The brightness of the LEDs can be adjusted by changing the value of the current limiting resistors or by using a potentiometer to vary the voltage at the REF IN pin.
• Can I use the LM3914N-1/NOPB with a different type of display, such as an LCD or a bargraph display?
  While the LM3914N-1/NOPB is designed to drive LEDs, it can be used with other types of displays, such as LCDs or bargraph displays, with additional circuitry and programming.