12 volt differential controller [RE-wrenches]

[Dean T. Newberry]

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Quick note the LM 335 will work just fine on 12VDC, you don't need the 
AT power supply.

Dean T. Newberry wrote:

> 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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