RussellMc wrote: > A spiral of suitably robust nichrome wire would probably allow enough > heat dissipation without a heat sink. Adding some blown air would help > greatly. I have dissipated hundreds of Watts in free air cooled coils > of Nichrome. Actually a really cheap load for that is a old fashioned LEB (light emittin= g bulb). One advantage is that people expect them to get hot, and they're designed to take it. However, I think a battery charger would look kindof dumb with a 150W light bulb sticking out the top. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .