How big of a heat sink should i get?


im following plans off site:

http://www.instructables.com/id/circuits-for-using-high-power-led-s/step6/the-new-stuff-constant-current-source-1/
(step 6)

, planning on using same nfet instructed electronics isnt par deviate much, run q2 (fairchild fqp50n06l) nfet 3 watts of power (2.8w exact). how big of heat sink should them run safely? looking @ off ebay

http://www.ebay.com/itm/5pcs-21x15x10mm-ic-aluminum-heat-sink-with-needle-to-220-mosfet-transistors-h1-/200800490404?pt=lh_defaultdomain_0&hash=item2ec0a453a4

enough nfets or should bigger?

im following plans off site: http://www.instructables.com/id/circuits-for-using-high-power-led-s/step6/the-new-stuff-constant-current-source-1/ (step 6) , planning on using same nfet instructed electronics isnt par deviate much, run q2 (fairchild...


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