On Thu, Mar 24, 2011 at 9:41 AM, PICdude wrote: > A few companies have done this before. =A0Though generally touted as > 78xx drop-in replacements, they're really not, as they require > relatively large external caps. =A0I've built a few different versions > on my own in the past, and they were truer drop-in replacements > (current was limited to 0.5A to 0.75A though). =A0IIRC cost was $4-5/ea > in hundreds. > I used this part from Murata recently: http://www.murata-ps.com/data/meters/dms-78xxsr.pdf Doesn't require any capacitance. And I was able to run a 3.3V line from the 20V available without heatsinking or burning off 16V. I'm pretty sure I got a few for under $5 each, but now the price on Mouser is close to $10. Murata was also partially affected by the disasters in Japan too though. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .