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Started by GaryRhodes, May 16, 2018, 03:05:30 PM
Quote from: Tim Hodges on May 17, 2018, 07:29:24 AMUse this calculator to work out what resistor you need:http://led.linear1.org/1led.wizTim suggests taking it off the 28v pad, a typical LED I've found online (10mm Orange LED) has a forward voltage of 2.2v and a forward current of 20ma. The calculator suggests a 1.5k ohm 2W resistor (2W as it needs to dissipate the heat generated.)Just so it's clear for others. You should have a red wire connecting to the 28v pad, then to the resistor, this then connects to the LED on the positive side, then the other side can have a wire going straight from the LED to ground (I use a black wire to help identification.)Like so:
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