DaBit
01-22-2004, 03:45 AM
I had to draw these up for someone quickly, so I thought I'd share them with you. Non-europeans might want to exchange part numbers for more common ones in their country.
Adjustable heat load. It's adjustable from 0 to about 180W heat output. Not ultimately stable, but stable within 5% shouldn't be a problem. Easy to build was the criteria here.
http://www.icecoldcomputing.com/generic/imagehandler.php?hval=a4389300c5821d8e1dc0dfa68c37 c23e&quality=high
Fan controller. Very similar to the one I use to control condenser fan speed. Component choice is not critical; any opamp will do as long as it hits close to the supply rails. The same is true for the output transistor; anything able to supply the fan current is OK.
The BD679 transistor is able to supply about 6 amps to the fans.
http://www.icecoldcomputing.com/generic/imagehandler.php?hval=81248fb5ac7ee5e398e77c7b5b60 aea8&quality=high
Have fun...
Adjustable heat load. It's adjustable from 0 to about 180W heat output. Not ultimately stable, but stable within 5% shouldn't be a problem. Easy to build was the criteria here.
http://www.icecoldcomputing.com/generic/imagehandler.php?hval=a4389300c5821d8e1dc0dfa68c37 c23e&quality=high
Fan controller. Very similar to the one I use to control condenser fan speed. Component choice is not critical; any opamp will do as long as it hits close to the supply rails. The same is true for the output transistor; anything able to supply the fan current is OK.
The BD679 transistor is able to supply about 6 amps to the fans.
http://www.icecoldcomputing.com/generic/imagehandler.php?hval=81248fb5ac7ee5e398e77c7b5b60 aea8&quality=high
Have fun...