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-   -   Detailed step-by-step stirplate speed control (http://www.homebrewtalk.com/f51/detailed-step-step-stirplate-speed-control-80711/)

hexmonkey 09-16-2008 09:43 PM

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! :mug:

scinerd3000 10-13-2008 09:59 PM

thank you for posting this- its exactly what i was looking for!

jbreiding 10-14-2008 07:49 PM

the details are actually in this post.

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

hexmonkey 10-14-2008 08:43 PM

Quote:

Originally Posted by jbreiding (Post 896472)
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? :confused:

scinerd3000 10-14-2008 09:35 PM

dont worry i found it the first time....

jlwalton 03-30-2009 08:06 PM

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!

jawsfree 02-20-2013 12:40 PM

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 80F 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.

alien 02-20-2013 04:46 PM

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.

jawsfree 02-22-2013 01:18 AM

Quote:

Originally Posted by alien (Post 4924619)
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?

alien 02-22-2013 03:00 AM

Actually I just bought one myself for less than $4. :mug:

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

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



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