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LED holder for extruder

by dzindra May 13, 2012
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If you put the LEDs in series instead of parallel, the required resistor would be 60 ohms and only 1/4 watt, which should be much easier to find and will be cheaper. Also then the total draw on the power supply is only 20ma rather than 60ma.

I actually use 47 ohms which drives the LEDs at 26ma, which is still well within spec for pretty much any standard LED.

The only reason not to do this would be if you are using LEDs that are not all of the same type, then you do need to put them in parallel, but you then also should use separate
current limiting resistors for each one.