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Old 12-19-2007, 02:15 PM   #31
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Quote:
Originally Posted by Trodd
How long do you leave it on the stir plate? Should you oxiginate it?
24 hours should allow the yeast to consume just about all the sugar in reproduction. Assuming you are pitching a tube/smack pack into 1-2 liters or 1.040 wort.

The whole point of the stirplate is oxygenate the wort and keep the yeast in suspension. Keeping the wort oxygenated is critical because when there is O2 available the yeast will reproduce, once the O2 is consumed the yeast will begin creating alcohol.
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Old 12-20-2007, 03:17 AM   #32
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Ok, I got my fan, and I snagged 2 old model train controllers which has speed control and direction control. (an old Tyco model). The only issue is that the fan is 12VDC (I think, all computer fans are 12VDC) and the output on teh controller is 18VDC and 16VDC. I'm a ME not a EE, so does anyone out there know what I need to drop the voltage down to 12VEC? Is it a simple resistor or should I just get a 12VDC supply from a model shop?

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Old 12-20-2007, 03:51 AM   #33
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Quote:
Originally Posted by Trodd
Ok, I got my fan, and I snagged 2 old model train controllers which has speed control and direction control. (an old Tyco model). The only issue is that the fan is 12VDC (I think, all computer fans are 12VDC) and the output on teh controller is 18VDC and 16VDC. I'm a ME not a EE, so does anyone out there know what I need to drop the voltage down to 12VEC? Is it a simple resistor or should I just get a 12VDC supply from a model shop?
Ok, here's the cool part. since it's a rheostat, you should be able to hook it up to either. zero on the control means zero voltage. move it up, and so goes the voltage. Now here's the tricky part. Hooking it (your fan) up to an 18 volt controller may fry (probably not) your fan motor. It most certainly will throw your stir bar. I've got a 6 Volt DC controller hooked up to a 12 volt fan and I get to about 25% and I toss the stir bar. Some of the other folks with vastly larger brains than I have may be able to direct you down better more productive paths than I on the disparity of voltages.
good luck!
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Old 12-27-2007, 04:34 AM   #34
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Check this out...second build of the bare bones...Made it for Nicksteck for Christmas.

[YOUTUBE]lDoKh0-P5yQ&rel=1[/YOUTUBE]

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Mom was right. Never argue with an idiot. They just drag you down to their level and beat you with experience.

Where's my beer. I know I left it around here somewhere.....
Kegged/Drinking:Nihilistic Integrity - Black IPA, #1 BIAB pale ale, Bells Two Hearted - yes a keg of the real stuff
Kegged/Conditioning:Wally N Seans Braggot, Emerald Eyes - Irish Red, Atomic Tsunami - brown
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Old 01-18-2008, 04:17 AM   #35
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Default Bare Bones Stirplate Ver. 3.1

I built another bare bones stir plate. This one is a double barrel 2000 ml bohemouth. I was using 500 ml starters which worked well, but I wanted to improve two things: 1. I wanted to be able to boil in the flask 2. I wanted to reduce the "tinking" noise I was getting from the jars I was using before. I went to midwest and ended up buying the 1000 ml flasks. So here's my question... what's the largest starter per 5 gal batch that you would pitch? I figured I'd pitch into two batches (1000 ml per batch) but would it hurt to pitch 2000 ml for a 5 gal batch? let me know what you think...

here's the photo:

Bare Bones 3.1



side note: if you power two fans with one power source, make sure you buy two of the same fan. the one on the left is actually stirring... but at a much slower rate.

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Mom was right. Never argue with an idiot. They just drag you down to their level and beat you with experience.

Where's my beer. I know I left it around here somewhere.....
Kegged/Drinking:Nihilistic Integrity - Black IPA, #1 BIAB pale ale, Bells Two Hearted - yes a keg of the real stuff
Kegged/Conditioning:Wally N Seans Braggot, Emerald Eyes - Irish Red, Atomic Tsunami - brown
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Old 01-28-2008, 12:39 AM   #36
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I made a one gallon starter using your initial design and it worked like a champ. Great idea Seabee.

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Old 01-28-2008, 01:09 AM   #37
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so...why the stirplate?

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Old 01-28-2008, 01:32 AM   #38
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Quote:
Originally Posted by OCB tilly
so...why the stirplate?
For those of us out there that like to make a yeast starter, (there are a few different reasons for this - a simple search will get you a wealth of information) you start out with a small amount of yeast, and pitch it into a "mini brew" of DME, water, and a nutrient - I like Go-Firm myself. Anyway, once you have your starter pitched, you want the yeast to ferment (grow) as much as possible. A stir plate aids this process by a. keeping the yeast suspended in the wort & b. oxygenating the yeast continually.

So say by the Wednesday before a Saturday brew, I pitch a starter of 1 LTR for a 5 gal batch. 1 ltr of yeast starter will reduce the time it takes for the fermentation of your beer. If you start out with a small amount of yeast, it takes a long time for the yeast to multiply enough to properly ferment your beer.
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Mom was right. Never argue with an idiot. They just drag you down to their level and beat you with experience.

Where's my beer. I know I left it around here somewhere.....
Kegged/Drinking:Nihilistic Integrity - Black IPA, #1 BIAB pale ale, Bells Two Hearted - yes a keg of the real stuff
Kegged/Conditioning:Wally N Seans Braggot, Emerald Eyes - Irish Red, Atomic Tsunami - brown
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Old 01-28-2008, 02:55 AM   #39
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Quote:
Originally Posted by Seabee John
... what's the largest starter per 5 gal batch that you would pitch? ...

For a Lager it wouldn't be uncommon to have a 2L or larger starter.
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Old 01-28-2008, 03:38 AM   #40
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You can sometimes get very good deals on used scientific equipment.

http://www.labx.com/v2/adsearch/deta...?adnumb=344931

no bids, $25 for a used stir plate.

ed. Right here in North-by-god-Carolina!!

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