thermistor with fan

[Johan Wagener]

could anyone tell me how I would go about making my power supply fan temp
controlled. I can obtain the following thermistors 100K 15K 4.7K and 47K.
Should I use the 4.7K? where would I place it?.

 

[Ken]

On Fri, 5 Sep 2003 21:52:30 +0200, "Johan Wagener"
<pil(nospam)@webmail.co.za> wrote:

could anyone tell me how I would go about making my power supply
fan temp controlled. I can obtain the following thermistors 100K
15K 4.7K and 47K. Should I use the 4.7K? where would I place it?.

You need some electronics between the thermistor and the fan.

--

+ Ken +

 

[Genome]

"Johan Wagener" <pil(nospam)@webmail.co.za> wrote in message
news:3f58e97e$0$64719@hades.is.co.za...

could anyone tell me how I would go about making my power supply fan temp
controlled. I can obtain the following thermistors 100K 15K 4.7K and 47K.
Should I use the 4.7K? where would I place it?.

Yes..... in fact I went and did a circuit diagram and composed a message for
ABSE and then went to the trouble of giving you access to it via someone
elses server just in case your ISP doesn't give it to you. I'm a nice guy(?)

Then my server bitched because it couldn't resolve some of your selected
newsgroups.

AT THAT STAGE I REALISED YOU HAD ARBITRARILY CROSS POSTED YOUR WINCY WHITE
SOUTH AFRICAN ARSE ALL OVER THE SHOP.

I don't mind if I come across as an half arsed idiot. You might......

Tough Tit. No answer

DNA


---
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Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.514 / Virus Database: 312 - Release Date: 8/28/03

 

[Johan Wagener]

shame

 

[Sam Goldwasser]

Ken <___ken3@telia.com> writes:

On Fri, 5 Sep 2003 21:52:30 +0200, "Johan Wagener"
pil(nospam)@webmail.co.za> wrote:

could anyone tell me how I would go about making my power supply
fan temp controlled. I can obtain the following thermistors 100K
15K 4.7K and 47K. Should I use the 4.7K? where would I place it?.

You need some electronics between the thermistor and the fan.

Here are a couple of circuits:

http://www.repairfaq.org/sam/fanctrl1.pdf
http://www.repairfaq.org/sam/fanctrl2.pdf

The first will switch the fan between off, low, and high.

The second will switch on at one temperature and then maintain the
temperature at a second selected value by varying fan speed.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the Feedback Form at repairfaq.org. Thanks.

 

[Baphomet]

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


"Johan Wagener" <pil(nospam)@webmail.co.za> wrote in message
news:3f58e97e$0$64719@hades.is.co.za...
could anyone tell me how I would go about making my power supply fan temp
controlled. I can obtain the following thermistors 100K 15K 4.7K and 47K.
Should I use the 4.7K? where would I place it?.

 

[Fred Bloggs]

Baphomet wrote:

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

Yes, good one!- less direct than Genome- but I admire your subtlety...

 

[John Fields]

On Fri, 5 Sep 2003 21:52:30 +0200, "Johan Wagener"
<pil(nospam)@webmail.co.za> wrote:

could anyone tell me how I would go about making my power supply fan temp
controlled. I can obtain the following thermistors 100K 15K 4.7K and 47K.
Should I use the 4.7K? where would I place it?.

---
Check "Thermistor fan control" at alt.binaries.schematics.electronic and
post any questions you may have.

--
John Fields

 

[Johan Wagener]

thanks Sam. exactly what I was looking for