Any idea where I can find a 50 ohm potentiometer? (1 Viewer)

[John Pine]

I checked at Parts Express and a few other on-line suppliers. Any suggestions?

 

[Mark Schermerhorn]

digikey.com should have them. I'd be suprised if they didn't.

 

[John Pine]

Mark thanks for the link! I'm checking it out now. The site is a little hard to navigate for a layman.

 

[Greg_L_C]

They Sell POTs at Radio Shack. Just curios, what are you doing?

Greg

 

[John Pine]

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!

 

[Greg_L_C]

John,
I've seen several PC cooling parts suppliers selling rheostat fan controls that would work for your application.

Greg

 

[John Pine]

Good idea Greg, I'll check out that angle.

 

[Tim Kilbride]

Here you go John...

One of many 50ohm trimmer pots @ Mouser.com

 

[John Pine]

Thanks Tim!

 

[John Miles]

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.

 

[Kevin P]

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.