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Home Brew Forums > Home Brewing Beer > DIY Projects > Chillers and Stir Plates > Detailed step-by-step stirplate speed control
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Old 09-16-2008, 10:43 PM   #1
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Default Detailed step-by-step stirplate speed control

For those of you considering building a stirplate with the advanced speed control circuit, as described in this thread:

http://www.homebrewtalk.com/f11/my-h...50/index3.html

I found a site that has a terrific step-by-step of how to create that speed control circuit:

LM317 Voltage Regulator

I just built one of these last night, (before I found the link) and coincidentally, this is almost exactly how I did it, down to the way the components are arranged on the board!

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Old 10-13-2008, 10:59 PM   #2
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thank you for posting this- its exactly what i was looking for!

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Old 10-14-2008, 08:49 PM   #3
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the details are actually in this post.

http://www.homebrewtalk.com/f11/my-h...850/#post88058

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Old 10-14-2008, 09:43 PM   #4
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Quote:
Originally Posted by jbreiding View Post
the details are actually in this post.

http://www.homebrewtalk.com/f11/my-h...850/#post88058
...isn't that the first link I gave in the OP?
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Old 10-14-2008, 10:35 PM   #5
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dont worry i found it the first time....

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Old 03-30-2009, 09:06 PM   #6
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Default Thanks!!

Now I can get started on this as well. I had purchased most of the parts several months ago but was at a loss as to haw to start building the circuit. It's been a looong time since I have done any of this stuff and I no longer have any of my old electronics manuals anymore. Thanks for the heads up on this great resource!

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Old 02-20-2013, 01:40 PM   #7
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quick question about the lm317. If I use it with a 12V transformer thats delivering 17v on my meter and between 300 and 500ma would I need to add an additional heat sink to the lm317? I tested it for 30 minutes on a breadboard without and additional heat sink and the top of the lm317 reached 80°F while running the fan with 4.5V. Just wasn't sure wheather it would get hotter than that over the course of 36-48 hours of continues operation.

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Old 02-20-2013, 05:46 PM   #8
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Ideally this circuit would be supplied with 14V instead of 12V because the LM317 will drop a couple of volts, at least. They can dissipate quite a bit of heat on their own so I don't know how necessary a heat sink is - especially with a fan blowing!

Another idea is to use a 12V LED dimmer. These use PWM rather than linear control and can be bought for less than $5.

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Old 02-22-2013, 02:18 AM   #9
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Quote:
Originally Posted by alien View Post
Another idea is to use a 12V LED dimmer. These use PWM rather than linear control and can be bought for less than $5.
Where can I find one for $5.00?
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Old 02-22-2013, 04:00 AM   #10
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Actually I just bought one myself for less than $4.

http://www.ebay.com/itm/251164944686

For a geeky teardown, to see what's inside, looky here:

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