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Discussion in 'After Hours Lounge (Off Topic)' started by John Pine, Oct 16, 2003.
I checked at Parts Express and a few other on-line suppliers. Any suggestions?
digikey.com should have them. I'd be suprised if they didn't.
Mark thanks for the link! I'm checking it out now. The site is a little hard to navigate for a layman.
They Sell POTs at Radio Shack. Just curios, what are you doing?
Greg: Not a 50 ohm pot. I've built a custom enclosure for my audio equipment and I'm using (2) parallel wired 92mm computer case(2.1W/0.39amps @)fans mounted at the top to vent it. They are powered by an old Rat Shack 12V DC 1amp 25watt power supply. I've plugged the p/s into the "Switched" AC output on my HK525. I need the pot to adjust the fans. I've been told that a pot higher the 50 ohms will have to much resistance. I gotta go to bed, I'm outta' here!
I've seen several PC cooling parts suppliers selling rheostat fan controls that would work for your application.
Good idea Greg, I'll check out that angle.
Here you go John...
One of many 50ohm trimmer pots @ Mouser.com
Um, if you try to control 800 mA (or even 1/10 that much) worth of DC fans with a trimmer potentiometer, hilarity (and smoke) will ensue.
John's right. You'll need a potentiometer/rheostat with a minimum 25 watt rating to control those fans, or else you'll smoke the pot (ok, that didn't come out right!) . Or use an adjustable voltage regulator circuit instead of just a pot. Or get one of those universal AC adapters with the voltage switch (usually 3, 4.5, 6, 7.5, 9 volts). With that you can set the voltage to whatever drives the fans at the speed you want.