never let yourself get this board
Moderators: NeilBlanchard, Ralf Hutter, sthayashi, Lawrence Lee
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- Posts: 291
- Joined: Mon Feb 10, 2003 11:19 am
never let yourself get this board
I needed something to do this afternoon other than push paper. So in my best effort to waste time I built a thermostat without a board. An image of the resulting rat's nest:
The thing with the heat sink switches the fan (white connector), the comparitor (IC in the blue socket) compares temperature to the threshold, the green wires go to the NTC thermistor, the bundle of resistors (I think there are 5) do the rest. Black and red wires go to the mobo fan header. I'll add a tach wire if I feel extra dumb.
Fan turns on at 35C, off at 28. Works like a champ. Uglier than sin.
Oh, and the black and red probes are watching to make sure it's working right--they are temporary.
Good times. The next step is to encapsulate the whole thing in epoxy. Don't try this at home (because it's dumb).
The thing with the heat sink switches the fan (white connector), the comparitor (IC in the blue socket) compares temperature to the threshold, the green wires go to the NTC thermistor, the bundle of resistors (I think there are 5) do the rest. Black and red wires go to the mobo fan header. I'll add a tach wire if I feel extra dumb.
Fan turns on at 35C, off at 28. Works like a champ. Uglier than sin.
Oh, and the black and red probes are watching to make sure it's working right--they are temporary.
Good times. The next step is to encapsulate the whole thing in epoxy. Don't try this at home (because it's dumb).
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- Posts: 291
- Joined: Mon Feb 10, 2003 11:19 am
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- SPCR Reviewer
- Posts: 8636
- Joined: Sat Nov 23, 2002 6:33 am
- Location: Sunny SoCal
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- SPCR Reviewer
- Posts: 8636
- Joined: Sat Nov 23, 2002 6:33 am
- Location: Sunny SoCal
-
- Posts: 291
- Joined: Mon Feb 10, 2003 11:19 am
-
- Posts: 291
- Joined: Mon Feb 10, 2003 11:19 am
I'd be flattered if Keanu Reeves would be willing to have this sucked out of his navel.
The latest development: I added diodes so it would run of +12 when the PC is on, +5sb when it's off. That way the fan keeps sucking out hot air (quietly) until the computer is cool even after it's turned off. I like that.
The down side is you have to splice into the main board power cable; +5sb is not available on any of the other PS connectors. More ugliness.
The latest development: I added diodes so it would run of +12 when the PC is on, +5sb when it's off. That way the fan keeps sucking out hot air (quietly) until the computer is cool even after it's turned off. I like that.
The down side is you have to splice into the main board power cable; +5sb is not available on any of the other PS connectors. More ugliness.