On Sun, Jan 23, 2011 at 12:47 AM, Harold Hallikainen wrote: > In your application, I think I'd just try to come up with a constant +24V > supply. You may be able to do this with a charge pump converter. I've use= d > one from TI that could output something like 300mA, but I think it will b= e > difficult finding a charge pump chip that will do much power at 24V. So, > you're probably back to a boost converter. Linear Technology has some nic= e > simple boost converter chips, and maybe even some modules that have > everything in one assembly. I think such a single chip solution will be > simpler than trying to build your own charge pump. That was my initial thought too. My problem is that it's proving harder to find a boost converter that has a high enough current rating that will fit in the allotted space. I wonder what would happen if I used a lower current boost converter and a large output cap. Then used a switch (MOSFET, etc) to pulse the LED for a short duration. I imagine it's somewhat similar to the other ideas proposed, but I need to keep studying the various ideas so I understand them a bit better. Thanks! Josh --=20 A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. =A0 =A0 =A0 =A0 -Douglas Adams --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .