Reply To: MPCNC 2.8w $100 laser add-on complete

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#13983

ualdayan
Participant

I bought this one: http://www.ebay.com/itm/321786637275?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

It showed Walye but they sent Goodlaser anyway – I already had ordered the resistor and diodes and planned to use that method to tune the current so that was fine. What is not so good though is the polarity silkscreening is backwards. It shows the negative on the outer part of the board for the fan, but after hooking a fan up the fan just got really hot but wasn’t spinning. I then used a multimeter and confirmed, the + is on the outer part of the board, and the – is on the inner part (the exact opposite of the silkscreen).