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Registered Member #1837
Joined: Tue Dec 02 2008, 02:20PM
Location: NYC
Posts: 65
I just completed construction of a Seebeck generator (completely copied design from Make magazine 15). I'm looking for suggestions to convert my average 1.8vdc into 5vdc. I found this chip ,C1,C1003,C1039,C1133,P1383 but 2v is peak I've ever generated and I don't want to count on it.
Not looking for a handout here, just some suggestions. Would you go microcontrolled boost converter? 555 boost? Any suggestions appreciated.
Basically I'm using a Peltier cell in reverse. Heating one side, cooling the other and using the generated voltage to charge my ipod. (I hope)
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
I made a peltier termoelectric generator ages ago. I used a MAX856 chip to generate 3.3 V and 5 V. It started up at about 0.8 V and kept running down to about 0.5 V at reduced output power and voltage.
It requires few external parts but is a pain to solder without proper surface mount parts since some connections have a maximum length of about 5 mm.
Sparkfun has several ready built modules like this one:
Registered Member #1837
Joined: Tue Dec 02 2008, 02:20PM
Location: NYC
Posts: 65
Thanks Bjorn, that sparkfun module is exactly what I was hoping to find. I guess my search technique is lacking because I tried to find something like this for a while.
Thanks again, I'll update with pics when its operational.
Dennis
edit:
Update! Bjorn's suggestion worked perfectly. My generator will happily run at 5v all day (as long as the candle burns.) Oddly I had to eliminate the 5v fan, I guess it was drawing too much current, as I could never get to full conversion when it was wired in. That's even better though, no moving parts. Thanks again Bjorn and I'll update with pics in a few days.
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Seebeck generator
