12 volt differential controller [RE-wrenches]

[Dean T. Newberry]

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Hi Mark,
I think the basic comparator is the LM 335  from National Semiconductor.
A google search for "comparator LM335" found the webpage, download the 
pdf for sample circuits. If you can read and build from schematics 
you've got it. I'll bet you can buy singles at Halstead or Fry's, some 
Radioshacks have them too. The rest of the stuff, resistors, capacitors, 
case and relay's can be got from most radio shack's or off their 
website. I think I would just use a power supply form an old AT computer 
to get a nice regulated 12Vdc and +- 5 too if you want it.
If you cut off all the computer pigtails and toss the fan, there 
probably is enough room to pack your components in the PS case, RS has 
some nice breadboards too for this kind of stuff.

good luck.  deant at dcn.org

Mark Downing, Hurshtown Alt. Power wrote:

>I am in dire need of a 12V differential controller that uses 10K thermisters
>for use on a Solar DHW system.
>Does anyone have one or know where I can get one?
>Can anyone supply a fairly simple circuit I can build to accomplish this
>function?
>
>Mark, Hurshtown Alternative Power
>
>
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