0-20V Bargraph Voltmeter

photo

0 – 20V LED Voltmeter kit displays the voltage of the source using 20 LED’s.  This projects  is based on the famous LM3914 IC from National Semiconductor.

Power Supply Input: 5 VDC Max @ 30 mA in DOT mode and 300 mA in BAR mode

Specifications

  • Output: 20 LED’s
  • Range selectable with onboard preset
  • 2 Types of display Bar and Dot selectable by a jumper
  • Berg connector for connecting power & voltage in
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 40 mm x 145 mm

Schematic

schematic

Parts List

0-20V_BOM

PCB

Comments

  • varga gabor

    Please, could you tell me what kind of LED’s did you use? Thanks!

    3 years ago
    • Electronics Lab

      These are common low power LEDs, normally rated at 2.1V and 20mA

      3 years ago

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