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Old 03-23-2012, 01:43 AM   #111
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Do I get bonus points for showing an actual starter currently underway?

Built with a Brewers Hardware pcb, plastic project box and various parts harvested from around the house.

BK

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Old 03-27-2012, 04:11 AM   #112
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I got excited about this project and decided to build my own as well. Here's what I came up with:



The case is something I had lying around, it looks like a cigar box but is actually a cake box (for Sacher Tortes, from Vienna). For the parts, I took apart an old Targus USB powered external laptop fan. I broke the fins off the fan, and used the USB power supply (5V) plugged into a spare iphone USB charger. A CD case provides the correct height. The magnets were something I found on our fridge, which I suspect are rare earth magnetic cubes.



It makes for a low-powered, but effective stir plate. The vortex only gets about an inch down at the highest speed, but if I really wanted to get more than that I could probably achieve it by using a higher voltage power supply.

I also made this video to show people who are interested in building their own stirplate how the distance of the magnets from the top of the box makes a big difference, and that it's not the goal to get them as close to the top of the box as possible. Also, if you're using two magnets like I am, you want them to have the opposite polarity facing up (in the video, I'm using round disc fridge magnets).

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Old 04-17-2012, 04:52 AM   #113
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Put one together tonight out of a cigar box, some cheap parts from Radio Shack, a magnet, and a PC fan. Have it hooked up to a 9V battery for now, but will hardwire it later. Not the prettiest (on the inside), but it works. Wonder if anyone has done this with 9V batteries, wonder how long it will last?

stirplate1.jpg   stirplate2.jpg  
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Old 04-17-2012, 06:36 AM   #114
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Quote:
Originally Posted by isukendall
Put one together tonight out of a cigar box, some cheap parts from Radio Shack, a magnet, and a PC fan. Have it hooked up to a 9V battery for now, but will hardwire it later. Not the prettiest (on the inside), but it works. Wonder if anyone has done this with 9V batteries, wonder how long it will last?
Looks good!!! Plus I love the note to "spin if you see me"... Hahahaa
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Old 04-17-2012, 02:57 PM   #115
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Looks good!!! Plus I love the note to "spin if you see me"... Hahahaa
Yeah, that was left from the last time I made a starter. We hosted the afterparty for our city league kickball team, and had a lot of people running through the house. Figured it couldn't hurt to keep the yeast going!
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Old 05-12-2012, 03:20 AM   #116
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Default My junk laying around turned in to a Stir Plate


6 liter yeast starter on the magnetic stir plate I made from stuff laying around and an $11 junction box from Lowes. It will pull a vortex to within an inch of the stir bar.

Fan speed controller to adjust RPM. The aluminum lip serves as a drip edge to keep liquid off the speed control knob. The feet are 1 inch thick strips of neoprene so it doesn't rattle. The lid is covered in sheet rubber for a non-slip surface.

120v, 4 inch fan with two stacks of rare earth magnets super glued to the fan hub. Put a couple vents on the back and the bottom for air circulation. Glued PVC elbows to the vents so fluids can't drip inside the box.
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Old 05-12-2012, 01:04 PM   #117
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Here's what I came up with.


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Old 05-12-2012, 01:20 PM   #118
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Here is mine. Pretty simple- normal cpu fan, hard drive magnet, cheap plastic box and control knob from radio shack. The only thing that sets mine aside is the funky sticker I pinched out of my sons video game

img_0373.jpg   img_0326.jpg  
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Old 05-12-2012, 02:43 PM   #119
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Gears of War is one of my favorites simply because the designers made it impossible to bunny-hop around while getting shot at.

My stir plate is Norse mythology themed centered around the mead of poetry story.

finished3stirring.jpg

xaftertop.jpg

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Old 05-12-2012, 07:39 PM   #120
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Hard drive magnets and 1" stir bars. The two fans have separate speed controls but are currently sharing one power switch. I have a variable voltage DC project cord that is shared between several devices. I've been running at 4.5V for smaller starters, but I'd go 6V+ if not doing smaller than 1L.

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