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I have found some things on this subject such as building a digital to analog converter out of resistors, anyone have any thoughts on this?
For a school project I am working on a mini-fridge using peltier units and I am currently wondering how to power the beasts. I have five 136.8 watt peltiers whose stats are:VMax 15.2IMax 9 Ohm 1.3 - 1.5deltaTMax(celsius) 67Using the bench top power supplies at my disposal i've only been able to get them up to 8 volts(on a good day) with 3 amps(where they quit), at that the peltiers can quickly get cold enough to freeze water and water covered fingers to them within a few seconds.
I intend to power this by plugging it in since it would require an ungodly amount of batteries. In my limited searching I havent found any wall adapter that gets anywhere near those values and it is starting to look like I may have to fashion one myself. I have zero experience with anything above 12 volts and zero experience with AC and would rather not play with the kind of power that could kill me.
Another problem is controlling the power to the peltier. It would be nice if once the fridge is cooled that I could lower the power to the peltier.
You could use the transformers in parallel if you wanted to... Bad stuff shouldn't happen when you approach the max current, only if you go over it.
@Soeren:So a few of these: http://www.radioshack.com/product/index.jsp?productId=2102702&tab=summaryWould not work if I wired them in parallel? I am pretty sure I have no tools for playing with transformers and so dont know how I would ensure correct phasing.
I found a wall wart that has an output of 12 VAC 7 VA. Apparently Lego is trying to kill its customers with high voltage . ............ d has 7 amps to feed the peltier.any thoughts?
And you can pick up a used 300-500w for $30!