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Messages - spud

#61
Amplifier Discussion / Re: Heatsinks for your poweramp
December 15, 2010, 12:45:13 PM
Hey I'm new here and I'm wanting to build a chip amp but when I started doing some reading and I realized that a heat-sink would be essential if I wanted any real power.  I did some searches and I found these guys:

http://www.heatsinkusa.com/storename/heatsinkusa/ViewDept-269591.aspx

Has anyone used this vendor?  Also, what size would be appropriate for a LM1875 chip amp implementation running about 15 - 20w? Probably 24v or so.  I figure the small 1 inch one would suffice since it's rated at 2.15o C/W/3 or am I not understanding the rating they give? 

Some background: I've built a few pedals (BSIABII, Double D) and have prototyped a few others (Plexi-izer, UBEscreamer, Hot-harmonics), finished 2 tube amps (AX84 HO and a Firefly) and still have 1 on the bench (a 5E3).  I've been considering taking a pedal like the ROG DD  and mating it to a chip-amp for some time but never taken the plunge.  I've got a bunch of parts (Caps, Res, Trans, Op-amps, etc) I've collected (I try to buy in bulk) and I started looking around for amp chips and I realized I needed a heat sink - but most are pretty pricey for what you get (did I mention I'm a cheap) which is a hunk of metal - but I found these guys and was wondering if this was a good source and what size(s) to get.   Optionally, if anyone can help me with doing the calculations to figure it out myself, that would be great.   

BTW - this seems like a real cool site and I'm jazzed that I found it.  Been reading a lot of the threads - great ideas and projects.

Thanks -

Jim