I like the idea of nichrome wire on a very large heatsink with a series of FETS - I've got a bunch of IRF530's in stock - I'll drive those against the nichrome on the same large heatsink (I've got a stack of old CPU sinks around) Then just run down to the auto parts store and get an ammeter - sounds like a great little weekend project! So no inexpensive off-the-shelf boxes that you guys know of? Thanks! DougM On Fri, Sep 30, 2011 at 10:40 AM, V G wrote: > On Fri, Sep 30, 2011 at 1:01 PM, doug metzler wro= te: > >> I'm thinking something benchtop with an analog ammeter and a big set >> dial that I can use to test FET heat under different load conditions. >> >> I did some googling but I only found babies - 0-1A. >> >> Do you guys know of anything that might fit the bill? =A0Unfortunately >> cost is a large consideration right now, but high accuracy is not >> necessary. >> >> for my purposes I'll be testing with 15VDC >> > > I designed this a few weeks ago: > > http://solar-blogg.blogspot.com/2011/09/constant-current-sourcesink.html > > You can add as many MOSFETs as you like. Can sink a LOT of current. Play > with the simulation yourself. Let me know if you want the LTSpice simulat= ion > file. > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .