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Old 18th June 2003, 08:30 PM   #1
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Default temp cantrolled fan circuit

will any/all of the following 3 circuits work? will my circuit (attached) also work? do i need to add anything, can i remove anything? do i need feedback? one of the 10k resistors in the right hand potential divider will be a verial resitor to set temp. also, the values are not correct, i will have to play around. thank you for any help in advance.

http://www.uoguelph.ca/~antoon/circ/heatsens.html

http://www.rason.org/Projects/fancont/fancont.htm

http://www.overclockers.com.au/techstuff/a_thermalfans/

thanks again
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Old 18th June 2003, 08:43 PM   #2
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Default There a single chipsolutions

Analog has a couple in which only one resistor is used for the "setpoint" -- I believe that they cost in the vicinity of $2.00 I would expect all the usual suspects (Int'l Rectifier, TI, National, Maxim) to provide something similar.
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Old 19th June 2003, 08:27 AM   #3
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what do these chips do? do they output PWM or the fan voltage? if PWM, i just want to use a 741 opamp, a thermister and a 2n3055. i already have these.
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Old 21st June 2003, 07:19 PM   #4
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i was thinking that there are three ways to do this:
a potential divider connected to a transistor's base
the circuits above
a thermister used in a 555 timer circuit, used as a PWM pulse contolling motor speed

which would be best? i have made a working prototype of my circuit above.
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Old 22nd June 2003, 02:24 AM   #5
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I haven't found easier

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Old 23rd June 2003, 03:21 PM   #6
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cool, thanks a lot. where can i get the LM317? and can i get free samples from anywhere? thanks again.
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Old 23rd June 2003, 03:32 PM   #7
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I don't think that a old 50 cents part can still be in a sample program.... when parts are dirty cheap and can be found even in a grocery (or almost...) I see no point in looking for free samples.

Cheers

Andrea
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Old 29th June 2003, 03:34 PM   #8
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could i use a different voltage regulator, and play with the values, or does it have to be a LM317?
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Old 29th June 2003, 03:44 PM   #9
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My dad put this together a few years back, I hope it help.

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Old 29th June 2003, 04:46 PM   #10
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Matt....your a cheapo..LOL....with the parts you have you can build a temp. unit...there are a alot of design examples out there using an op amp as a comparator....if you really want it for free go to Maxim`s site and look at the Dallas temp controllers I`m utilising one right now with a PIC

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