05-29-2003, 04:05 AM
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#33
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Cooling Savant
Join Date: Jun 2001
Location: Norway
Posts: 108
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Quote:
Originally posted by Groth
I've bread-boarded and bench-tested this one. It will do the essentials as long as your pump and pelt are activate by relays.
At a cold side temperature above that set by the 50k pot, the lower comparator has a zero volt output, which keeps the optocoupler off, which keeps the motherboard from getting the power-ok signal. After a little thermistor chilling, the comparator goes high, turns on the opto, and the board boots. With the comparator high, the 150k resistor provides positive feedback, putting the reset temperature about 5 C higher.
On the hot side, a similar thing. If the temperature is too high, the upper comparator goes low, turning off the optocoupler and interrupting the powersupply-on line, which shuts off PSU.
OK. What've ya got?
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Hmmm, are there any reasone for using those optical buffers (in lake of a better word)? Need to use mony? 
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