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LED Resistor Selector DialAuthor
Giorgos Lazaridis
December 14, 2012


I made something completely different from the electronic projects that i usually make. This time i made a tool for the amateur friends that want a simple and easy way to calculate the resistor value for the limiting resistor to drive one or more LEDs.

You only need to rotate the wheel and align the supply voltage with the LED forward voltage, and you can immediately read the resistor value and power. Here is a video with this make:

You can go now to the worklog and read:

  • Page 1: The theory behind this selector and the math to choose the proper resistor value
  • Page 2: How to make this selector
  • Page 3: How to use this selector

  •    Continue reading. Click here to view the worklog.



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  • At 16 January 2013, 15:36:19 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
    • @AAVV corel draw

  • At 16 January 2013, 8:23:50 user AAVV wrote:   [reply @ AAVV]


  • At 15 January 2013, 6:02:24 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
    • @Mark Wops!!! Thanks!

  • At 15 January 2013, 0:39:25 user Mark wrote:   [reply @ Mark]
    • fantastic. one slight error on page 2 "As you can see, for 20mA current you should select a resistor around 140 mA... " shouldn't that be ohms :)

  • At 14 January 2013, 23:32:56 user Jeff wrote:   [reply @ Jeff]
    • This is genius! I love it, will definitely come in handy! I may laser etch a version in acrylic, if so I'll send you one!

  • At 8 January 2013, 18:45:05 user N!ck_modmag.net wrote:   [reply @ N!ck_modmag.net]
    • Awesome job! Featured this project on our website - http://en.modmag.net/news/led-resistor-selector-dial-by-giorgos-lazaridis

  • At 15 December 2012, 21:40:19 user Panagiotis Kalogeris wrote:   [reply @ Panagiotis Kalogeris]
    • A-W-E-S-O-M-E....!!!!!!!!!!!!!!!!

    reddit this Reddit this

     HOT in heaven!

    NEW in heaven!

    New Theory: AC electric motor working principle

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