At 12:44 PM 11/23/2005, Olin Lathrop wrote: >Brooke Clarke wrote: > > I got a Honeywell Q313 series "750 millivolt Powerpile Generator" and > > have measured it's output when in one finger of a gas stove flame. > > It puts out about half a volt at 100 ma with a 5 Ohm load (50 mw) and > > probably would produce more power with a lower resistance load. > > See: http://www.pacificsites.com/~brooke/batt.shtml#Heat > >Your figures for open circuit and 5 ohm load indicate the pile has about 3 >ohms resistance. > > > Is there a circuit that would transform this into say 3.3 volts at 10 > > ma that would be suitable to power a PIC? > >Not without some serious magic. 3.3V x 10mA = 330mW. That's nearly 7 times >what you measured with a 5 ohm load. Where exactly do you expect this power >to come from? I'm probably being obtuse today, but 3.3V @ 10mA sure looks like 33mW to me. You might consider putting a pair of those thermopiles in series and then using one of the Maxim single-cell switchers to convert the resulting voltage to your desired level. Might just work . . . dwayne -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 21 years of Engineering Innovation (1984 - 2005) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist