Dual Stir Plate Setup
#1
Posted 02 September 2009 - 01:32 PM
#2
Posted 02 September 2009 - 01:58 PM
#3
Posted 02 September 2009 - 01:59 PM
#4
Posted 02 September 2009 - 02:11 PM
Thanks Jay. It was not that entirely difficult to make. Yes that is a 5V Phone Charger. We tried a 9V and a 12V but 9V spun the bar pretty fast and the 12V basically threw the stir bar off in a short period of time. JK,Let me see if I can put together the parts list for this. Its mostly Radio Shack pieces. The base is a plastic liner for a silverware drawer organizer.Is that a phone charger you have powering it?! How easy was it to make one of these?
#5
Posted 02 September 2009 - 02:47 PM
#6
Posted 02 September 2009 - 03:46 PM
Yes there is about a quarter inch clearance below the fans. The bottom is open as well. The fans run pretty cool. I used the one when it was a single unit and there was not any heat that I could detect from the touch too.Do the fans have any clearance to circulate air? I would think those fan motors would overheat if they don't have a constant airflow on them.
#7
Posted 02 September 2009 - 07:05 PM
#8
Posted 02 September 2009 - 08:17 PM
#9
Posted 03 September 2009 - 02:39 AM
Thanks Ed. I appreciate it. Ready to put it to use this weekend. It was a fun build.I have to say that it looks awesome. Nicely Done.Ed
JK, I have used the fan and magnet to stir up to a 3 liter starter. I have a 2L flask and am getting another today too. Sometimes you have to turn up the potentiometer to start the stir bar spinning but can turn it down immediately to let it sit and stir continuously too. So that is the best answer I can give you at this point.What's the stirring capacity on one of those things?
#10
Posted 03 September 2009 - 05:20 AM
#11
Posted 03 September 2009 - 12:02 PM
#12
Posted 03 September 2009 - 03:26 PM
The Potentiometers are 25 Ohms and are linear resistance as well. They are from Radio shack along with most of the rest of the electrical components. Fan, on/off switches as well.Nicely done, looks great. Thanks Stellar!! Got a pack of 1084 and 3068 and brewing two this weekend so its going to be put to use tomorrow night for sure. For the potentiometers, do you use linear resistance or log resistance for one of these?
#13
Posted 03 September 2009 - 08:53 PM
#14
Posted 03 September 2009 - 09:11 PM
They do it by continuously and efficiently exposing the yeast to oxygen. As the oxygen from the air absorbs into the wort, the oxygen in the air above the wort is depleted, then oxygen from outside the flask diffuses in to raise the concentration back to equilibrium. So you have oxygen continuously being pulled into the flask and you have very efficient transfer of gas into the liquid due to the agitation. Having the yeast well suspended also helps.Quick question. Do stir plates oxygenate the starter by creating turbulance, or do they just keep yeast in suspention? I know stir plates are good to have for a starter, but I'm just not sure why.
#15
Posted 07 September 2009 - 05:58 AM
#16
Posted 07 September 2009 - 06:17 AM
Of course one works fine but two is better. This weekend I needed two starters 1084 and 3068. Having two plates meant starters were on Fri night one pitched Sat one last night. Plus I do 10 gallon beers with friends and pitch two packs of yeast so doing one starter batch split btw two stir plates is awesome. For me two is perfect. It worked awesome this weekend.I would think only one wall wort would be required.Did you really need two?
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