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Subject: Temperature controller not working?
By: Fred (IP: 82.174.51.*)
Written on: 04-03-2006 00:07

Hello all,

I just made the temperature controller. Checked every connection. The fan does not start. I checked voltages on pcb. I got no voltage on the black wire from mosfet to the - lead from fan. Everything else seems to get powered.

Anyone has any clue what i'm doing wrong?
Oh yes, i found that during soldering mosfet an ntc become hot. Did i screw these up?

Maybe someone has an step by step debugging advice?

Thanks for any advice
Fred

Replies:

By: Tillmann (IP: 84.58.145.*)
Written on: 04-03-2006 10:33

Hi,

you need to try with different positions of the potentiometer/spindle trimmer.

It is unlikely that you have damaged the NTC; these parts are pretty heat resistant.

bye,
Till

By: Fred (IP: 82.174.14.*)
Written on: 04-03-2006 12:56

Hi Till

Thanks for your quick reply!
I tried to teaw positions on the spindlke trimmer, no workie.

My pot-trimmer is an Bourns 3296, it has three feet. I connected position 2 (wiper) http://www.bourns.com/pdfs/3296.pdf to ground wire

Position 3 (clockwise) goes to mosfet.

Maybe here's something wrong?

Fred

By: Fred (IP: 82.174.21.*)
Written on: 05-03-2006 21:28

Hi all,

It's working! I had to solder to the other trimmers lead.

Thanks for the great solution!
Now the only thing that still makes noise is my harddisk.
Lets get an samsung spinpoint!

Best
Fred