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  1. animattor's Avatar
    Member Since
    Feb 2014
    Posts
    189
    Mar 15, 2014, 7:46 PM - Range Finder LEDs #1

    Is there anyone willing to share a schismatic of how to put together a small board with the LEds for the rangefinder. I really want to build it myself to keep my costs down but am unsure of the resistors needed. Thanks guys.
  2. Jc27's Avatar
    Member Since
    Jun 2012
    Posts
    1,836
    Mar 15, 2014, 8:21 PM - Re: Range Finder LEDs #2

    You need to know the input voltage, the voltage of the LEDs as well as their current draw, to figure out what size resistors you will need.
  3. Jigglenomicon's Avatar
    Member Since
    Mar 2013
    Posts
    172
    Mar 15, 2014, 8:30 PM - Re: Range Finder LEDs #3

    you can use this calculator to know how big of a a resistor you need
    but only if the leds draw the same voltage and forward current
    LED series parallel array wizard

    For example i have 3 leds running in a parallel circut ,
    Eatch draw 1.5 to 2v and their forward current is 20mA ,
    so if i use a 9v battery i need a 150 ohms resistor.

    Hope that helps a tad.
  4. animattor's Avatar
    Member Since
    Feb 2014
    Posts
    189
    Mar 15, 2014, 11:14 PM - Re: Range Finder LEDs #4

    Thanks Jig that info was what was missing when we were at radio shack.
  5. Jigglenomicon's Avatar
    Member Since
    Mar 2013
    Posts
    172
    Mar 16, 2014, 11:25 AM - Re: Range Finder LEDs #5

    eh.. doh i meant a serial circuit not parallel .
    the calculator should work in both cases i think.
  6. Jigglenomicon's Avatar
    Member Since
    Mar 2013
    Posts
    172
    Mar 16, 2014, 11:35 AM - Re: Range Finder LEDs #6

    also if you want some blinking red leds on top of the rangefinder you can get some that works without having a timer on your circut
    MSB557DA datasheet

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