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Old 01-17-2008, 08:27 PM   #1
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Default If I burn down the house, SWMBO wont let me brew...

I got the Ok from SWMBO to make a fermentation chamber and I was thinking of one close to this. Now I ws thinking of building it a little longer and butting a divider in the center, with two individually controled temperature chambers. After some looking and ploting, I realised that I know enought about electronics to know when to ask for help!

I wanted to put the two fan/thermostat circuts in paralel off of one AC-DC converter. I was going to convert the thermostats to be remote sensing, but hook them into the same power supply. I know they run on 24V DC, and the fans are 24V DC. Am I overloking anything? The parts I am looking at are below.


transformer:
http://www.jameco.com/webapp/wcs/sto...60&pa=220960PS

Fans:
http://www.jameco.com/webapp/wcs/sto...11&pa=153411PS

Thermostat:
http://www.homedepot.com/webapp/wcs/...egoryID=503549


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Old 01-17-2008, 08:30 PM   #2
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I appauld you on your endeavor, but you don't need to go overboard.

For transformers, check a local pawn shop. We can get them for $5. here. That'll save you some $$$


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Old 01-17-2008, 08:34 PM   #3
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I 100% agree. I mostly put the links up so people would know what parts I am looking at.
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Old 01-17-2008, 09:39 PM   #4
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Are you putting the fans on relays or will the tstats be able to handle the amperage?
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Old 01-17-2008, 09:41 PM   #5
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Couldn't you just use an old PC power supply?
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Old 01-17-2008, 09:46 PM   #6
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Aren't those 12v?
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Old 01-17-2008, 10:28 PM   #7
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yes, PC power supplies are 12V, I did think about that briefly because I do have one just lying around. The problem with one of those are the thermostats run of a 24V heating/cooling system. If someone knows of a 12V thermostat, that would make alot of things easier....

As for the thermostats handling the amperage, I dont know, but I am glad you mentioned it. THe online specs didnt mention that, but when I get a thermostat, I will take that into consideration. The transformer i was looking at only ran at 1 amp, and the fans would be 2 280mA loads in paralell, so..... I don't know...

If anyone else knows a better way to rig a system like this up (for a little less would be best) let me know.

I will post a schematic of my original idea as soon as I get around to it....
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Old 01-17-2008, 10:45 PM   #8
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Ok, it took every ounce of technical skill I have to come up with this schematic...
Click image for larger version

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in theory, would this work? what should I look out for/change? Once again, is there an easier way to do this? (temperature sensor/switch/magic?)

EDIT: oh, that sould read AC to DC..... my bad
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Old 01-17-2008, 11:18 PM   #9
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That was some bad advice. Dont know what I was thinking when I wrote it.
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Old 01-17-2008, 11:19 PM   #10
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Might be a little overkill, or not, but here's a pretty cool setup that would just as easy run a couple PC fans off a PC power supply. I just don't see a temp range listed. I also tried looking through Mouser's website, but wasn't coming up with too much there that was blow the 95-100F range.


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