newbie stir plate questions - Home Brew Forums

Register Now!
Home Brew Forums > Home Brewing Beer > DIY Projects > Chillers & Stir Plates > newbie stir plate questions

Reply
 
Thread Tools
Old 06-30-2013, 11:51 AM   #1
mChavez
Recipes 
 
May 2013
Posts: 112
Liked 1 Times on 1 Posts



Hi!

I've done some reading on diy stir plates, and I decided to make one for myself.

I would be very grateful for some feedback about the following build:

1) I found this fan:
http://www.ebay.co.uk/itm/12cm-SATA-...20601500683%26

It is a 10-14V voltage & 0.45A current.
I've got 2 old phone chargers but they are:
1) 5v, 550mA
2)5.7v, 800mA

Would it be safe to use the fan with any of the chargers above? Not enough voltage & too high current =(

2) I've noticed that some builds have a potentiometer attached - is that just for regulating fan speed? Is it essential?

3) I'm going to use a 2l flask with the stir plate, following the advice in the yeast freezing thread. What size of a stirrer should I use? 35x6mm or 50x8mm?

Thank you very much for your help!
__________________
Finished: Munton's Nut Brown Ale; Cooper's Wheat Beer; EdWort's Apfelwein; Coopers IPA kit with additional hops; Munton's Stout; Extract Oktoberfast; Extract Hefeweizen; Extract Rauchbier; Extract Startup Scottish Ale; Dooval;
Bottled: California Connoisseur Roja Tinto, Christmas Trappist; Elderflower wine;
Fermenting: Kefir;
ToDo: BCB Porter; ZZ-Hop light honey beer; Extract blonde ale; Extract IPA;

 
Reply With Quote
Old 06-30-2013, 12:35 PM   #2
aiptasia
 
aiptasia's Avatar
Recipes 
 
Jul 2011
Them Scary Woods, FL
Posts: 3,490
Liked 542 Times on 479 Posts


1) Go to radio shack and buy a cheap adjustable volt wall wort.

2) Yes, it does help regulate the amount of spin from the fan motor. It is a nice feature and I would recommend it.

3) The larger stirrer would be my choice provided it fits down the neck of the flask, with at least 1" clearance on either side at the base.
__________________
Paranormal Brewing
Beer so good, it's frightening.

2014: Seven Heavens Series One: Vilon, Mystic Melomel, Skeeter Pee.

 
Reply With Quote
Old 06-30-2013, 01:27 PM   #3
mChavez
Recipes 
 
May 2013
Posts: 112
Liked 1 Times on 1 Posts


Thanks!

Will there be any issues if I use a 12V 500mA power source for a 450mA fan?
Also, what resistance on the pot should I look for?
__________________
Finished: Munton's Nut Brown Ale; Cooper's Wheat Beer; EdWort's Apfelwein; Coopers IPA kit with additional hops; Munton's Stout; Extract Oktoberfast; Extract Hefeweizen; Extract Rauchbier; Extract Startup Scottish Ale; Dooval;
Bottled: California Connoisseur Roja Tinto, Christmas Trappist; Elderflower wine;
Fermenting: Kefir;
ToDo: BCB Porter; ZZ-Hop light honey beer; Extract blonde ale; Extract IPA;

 
Reply With Quote
Old 06-30-2013, 07:41 PM   #4
Tapout
Recipes 
 
Jun 2013
Posts: 88
Liked 3 Times on 3 Posts


I built mine with a 60mm fan instead of the 120mm you're looking at. I have a friend that fixes computers and he gave me a couple.

Fan is a 12 volt and I'm using a 5 volt charger from an old Bluetooth earpiece.

I have a 2 liter flask and a 1 inch stir bar can bring the vortex to the bottom with 1800ml in the flask. Not constantly to the bottom, but often enough to get air mixing in. I might get a 2 inch stir bar for anything larger than 1 liter.

 
Reply With Quote
Old 06-30-2013, 09:42 PM   #5
mChavez
Recipes 
 
May 2013
Posts: 112
Liked 1 Times on 1 Posts


Thanks for the info!

Am I correct to assume that having a 500mA power source will be absolutely fine for a 450mA fan?
__________________
Finished: Munton's Nut Brown Ale; Cooper's Wheat Beer; EdWort's Apfelwein; Coopers IPA kit with additional hops; Munton's Stout; Extract Oktoberfast; Extract Hefeweizen; Extract Rauchbier; Extract Startup Scottish Ale; Dooval;
Bottled: California Connoisseur Roja Tinto, Christmas Trappist; Elderflower wine;
Fermenting: Kefir;
ToDo: BCB Porter; ZZ-Hop light honey beer; Extract blonde ale; Extract IPA;

 
Reply With Quote
Old 06-30-2013, 10:19 PM   #6
mrmrsdsg
Recipes 
 
Apr 2013
Posts: 4

Through Trial and error, I have built two of these now. I also used a 60 mm fan which is just fine. I first tore up a hard drive, but then I found the magnets on amazon.

My first one was built in a plastic screw box, my second was in a cigar box. Both work, but the cigar box looks pretty awesome and makes a great conversation piece.

I used a 5 volt it is wan't strong enough to power the fan. I now have a 10v supply with a 30 volt potentiometer (that's all I could find). The spin doesn't start until I get toward the highest power on the knob, but it does work. My 10 volt will get the vortex from top to bottom using a 1" bar and a full 1000ml flask.

 
Reply With Quote
Old 06-30-2013, 11:20 PM   #7
Tapout
Recipes 
 
Jun 2013
Posts: 88
Liked 3 Times on 3 Posts


I never looked at the milliamperes of either my fan or power supply, so couldn't tell you. I'd just wire them up and find out. As long as you're watching, if anything starts to smoke, you can unplug it.

 
Reply With Quote
Old 07-01-2013, 03:45 AM   #8
rjmaster19
Recipes 
 
Apr 2013
Sugar Land, TEXAS
Posts: 27
Liked 2 Times on 2 Posts


Yes a 500mA power supply will work for a 450mA fan.

You need a bigger power supply if your fan Amps is greater than your power supply Amps. If your your power supply is more power than your fan, you're good.

(I'm assuming its a 12V fan, and a 12V power supply)

 
Reply With Quote
Old 07-01-2013, 05:49 AM   #9
FuzzeWuzze
I Love DIY
HBT_SUPPORTER.png
 
FuzzeWuzze's Avatar
Recipes 
 
Jun 2012
Newberg, Oregon
Posts: 3,083
Liked 416 Times on 306 Posts


Quote:
Originally Posted by mChavez View Post
Thanks for the info!

Am I correct to assume that having a 500mA power source will be absolutely fine for a 450mA fan?
Yes, higher amp rating on the power supply is always better.

450mA is how many amps the fan will draw, 500mA is how much the power supply CAN source, not what it will source.

So you can have a 2A source and 450mA fan and have no issues.

That said, another really good place to go if you dont want to spend the money on an adjustable power supply is GoodWill. All of them have electronics sections with tons of loose power cables, you can find power supplys of all shapes and sizes. For example i just bought an old Gamecube 12V 5A power supply for $3 for my pump. Chop the end off and wire it in.

 
Reply With Quote
Old 07-01-2013, 07:34 PM   #10
mChavez
Recipes 
 
May 2013
Posts: 112
Liked 1 Times on 1 Posts


Thanks!
__________________
Finished: Munton's Nut Brown Ale; Cooper's Wheat Beer; EdWort's Apfelwein; Coopers IPA kit with additional hops; Munton's Stout; Extract Oktoberfast; Extract Hefeweizen; Extract Rauchbier; Extract Startup Scottish Ale; Dooval;
Bottled: California Connoisseur Roja Tinto, Christmas Trappist; Elderflower wine;
Fermenting: Kefir;
ToDo: BCB Porter; ZZ-Hop light honey beer; Extract blonde ale; Extract IPA;

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Stir plate - Potentiometer and fan questions... kontrol Chillers & Stir Plates 6 04-26-2013 03:27 PM
stir plate questions. Jeepaholic Fermentation & Yeast 5 08-15-2012 04:07 AM
Stir Plate Newbie gotsumbeers Fermentation & Yeast 1 07-26-2012 09:08 PM
Stir Plate Questions... Tanagra Fermentation & Yeast 12 12-29-2010 03:58 PM
Stir plate questions jimgriz Beginners Beer Brewing Forum 3 10-26-2009 08:50 PM


Forum Jump