http://www.vanoustech.com/amp-potentiometer/
What size potentiometer can control the speed of a 12V DC 0.24 Amp Computer fan?
You would need a 50 Ω potentiometer that can handle about 5 watts wired in series with your fan. That will insure that you don't burn out the resistance track when you are only using part of it's full resistance. Such a pot will be expensive and hard to locate.
You'll be better off buying an electronic fan controller that is made for the purpose.
Don
Check out these deals on Amp Potentiometer-related items and save!
 New CTS potentiometer fits Fender amps - 3M rev audio US $4.95 
|
 Alpha 8mm dual guitar amp effect potentiometer 50k log US $5.25
|
 Alpha 8mm dual guitar amp effect potentiometer 500k log US $5.25
|
 Alpha 8mm dual guitar amp effect potentiometer 500k lin US $5.25
|
 Alpha 8mm dual guitar amp effect potentiometer 250k log US $5.25
|
 Alpha 8mm dual guitar amp effect potentiometer 1M log US $5.25
|
 Alpha 8mm dual guitar amp effect potentiometer 10k log US $5.25
|
 Alpha 8mm bushing guitar amp potentiometer 5k log US $3.25
|
 Alpha 8mm bushing guitar amp potentiometer 5k linear US $3.25
|
 Alpha 8mm bushing guitar amp potentiometer 50k linear US $3.25
|
 Alpha 8mm bushing guitar amp potentiometer 500k log US $3.25
|
 Alpha 8mm bushing guitar amp potentiometer 1M log/audio US $3.25
|
 Alpha 8mm bushing guitar amp potentiometer 1k log US $3.25
|
 Alpha 8mm bushing guitar amp potentiometer 1k linear US $3.25
|
 Alpha 8mm bushing guitar amp potentiometer 10k linear US $3.25
|
 Alpha 8mm bushing guitar amp potentiometer 100k linear US $3.25
|
 Alpha 3/8" bushing guitar amp potentiometer 500k linear US $3.25
|
 Alpha 3/8" bushing guitar amp potentiometer 100k linear US $3.25
|
 Alpha 3/8" bushing guitar amp potentiometer - 25k log US $3.25
|
 Alpha 3/8" bushing guitar amp potentiometer - 250k log US $3.25
|
 Alpha 3/8" bushing guitar amp potentiometer - 10k log US $3.25
|
 NEW Genuine Fender 50K B PCB Amp Potentiometer Pot US $5.99
|
 PEAVEY 5150 AMP 1M REPLACEMENT POT! 1 MEG AUDIO POTENTIOMETER US $6.49
|
 Marshall amp potentiometer 16mm 100k linear PC mount US $5.25
|
 Marshall amp potentiometer 16mm 100k log/audio PC mount US $5.25
|
 Marshall amp potentiometer 16mm 1M log/audio PC mount US $5.25
|
 Marshall amp potentiometer 16mm 220k linear PC mount US $5.25
|
 Marshall amp potentiometer 16mm 22k linear PC mount US $5.25
|
 Marshall amp potentiometer 16mm 4.7k linear PC mount US $5.25
|
 Marshall amp potentiometer 16mm dual 10k linear PC mnt US $6.50
|
 Marshall amp potentiometer 24mm 100k linear PC mount US $5.75
|
 Marshall amp potentiometer 24mm 220k log/audio PC mount US $5.75
|
 Marshall amp potentiometer 24mm 22k linear PC mount US $5.75
|
 Marshall amp potentiometer 24mm 22k log/audio PC mount US $5.75
|
 Marshall amp potentiometer 24mm 4.7k log/audio PC mount US $5.75
|
 Marshall amp potentiometer 11mm 5k linear PC mount US $5.95
|
 NEW Fender BXR 100K 10A/100K 5C Amp Potentiometer Pot US $5.99
|
 NEW Genuine Fender 2K 15A PCB Amp Potentiometer Pot US $5.99
|
 5 KL POTENTIOMETER - VINTAGE FENDER AMP PRESENCE LEVEL US $5.95
|
 10 KA POTENTIOMETER VINTAGE FENDER AMP MIDDLE CONTROL US $6.55
|
 CTS 1 MEG PUSH/PULL VOL TONE POTENTIOMETER GUITAR/AMPS US $15.95
|
 New CTS potentiometer fits Fender amps - 50k rev audio US $4.95
|
 New CTS potentiometer fits Fender amps - 500k audio US $4.95
|
 New CTS potentiometer fits Fender amps - 250k audio US $4.95
|
 New CTS potentiometer fits Fender amps - 1M log/audio US $4.95
|
 New CTS potentiometer fits Fender amps - 10k audio US $4.95
|
 Marshall amp potentiometer 16mm 10k linear PC mount US $5.25
|
 Marshall amp potentiometer 24mm 1M log/audio PC mount US $5.75
|
 Marshall amp potentiometer 24mm 220k linear PC mount US $5.75
|
 Marshall amp potentiometer 24mm 4.7k linear PC mount US $5.75
|
 Marshall amp potentiometer 24mm 100k log/audio PC mount US $5.75
|
 Alpha 3/8" bushing guitar amp potentiometer - 5k linear US $3.25
|
 Marshall amp potentiometer 11mm 100k log/audio PC mount US $5.95
|
 Marshall amp potentiometer 11mm 100k linear PC mount US $5.95
|
 Alpha 3/8" bushing guitar amp potentiometer - 2M linear US $3.25
|
 Marshall amp potentiometer 11mm 200k log/audio PC mount US $5.95
|
 Marshall amp potentiometer 11mm 200k linear PC mount US $5.95
|
 Marshall amp potentiometer 11mm 20k linear PC mount US $5.95
|
 Marshall amp potentiometer 11mm 500k log/audio PC mount US $5.95
|
 Alpha 8mm bushing guitar amp potentiometer 50k log US $3.25
|
 Alpha 3/8" bushing guitar amp potentiometer - 1M log US $3.25
|
 Alpha 8mm bushing guitar amp potentiometer 250k linear US $3.25
|
 Alpha 8mm bushing guitar amp potentiometer 1M linear US $3.25
|
 Alpha 8mm bushing guitar amp potentiometer 10k log US $3.25
|
 Alpha 3/8" bushing guitar amp potentiometer - 100k log US $3.25
|
 Alpha 3/8" bushing guitar amp potentiometer 25k linear US $3.25
|
 Alpha 3/8" bushing guitar amp potentiometer 250k linear US $3.25
|
 New CTS potentiometer fits Fender amps - 100k linear US $4.95
|
 Alpha 8mm dual guitar amp effect potentiometer 250k lin US $5.25
|
 Alpha 8mm dual guitar amp effect potentiometer 1M lin US $5.25
|
 Alpha 8mm dual guitar amp effect potentiometer 100k log US $5.25
|
 Alpha 8mm dual guitar amp effect potentiometer 100k lin US $5.25
|
 NEW Genuine Fender 50K 15A PCB Amp Potentiometer Pot US $5.99
|
Fender Amp Repair Dirty Volume Pot Stinky Tubes
Recently found via this site:
NEW Genuine Fender 100K 30C PCB Amp Potentiometer Pot, NEW Fender BXR 25K 2B Detent PCB Amp Potentiometer Pot, NEW Genuine Fender 1 Meg 5C PCB Amp Potentiometer Pot, NEW Genuine Fender 50K 15A PCB Amp Potentiometer Pot, NEW Genuine Fender 50K 30C PCB Amp Potentiometer Pot, Fender 002-3508-000 Control 100K 20% LIN Potentiometer Pot Twin Amp, NEW Genuine Fender 250K 30C PCB Amp Potentiometer Pot, BRAND NEW Genuine Fender 50K 15A PCB Amp Potentiometer Pot - Princeton 65 Volume, NEW Genuine Fender 2K 15A PCB Amp Potentiometer Pot, NEW Fender BXR 100K 10A/100K 5C Amp Potentiometer Pot, NEW Genuine Fender 50K B PCB Amp Potentiometer Pot, 1 MEG AUDIO ON / OFF POTENTIOMETER GUITAR TWEED AMPS , NEW Fender 50K 2B Detent PCB Amp Potentiometer Pot, NEW Fender 5K 50% Detent PCB Amp Potentiometer Pot, NEW Genuine Fender 100K B PCB Amp Potentiometer Pot, Genuine Fender 25K B Snap In Amplifier Amp Potentiometer Pot 0041510000 NEW, 10 New A100K Audio PCB Potentiometers Guitar Amp/Stereo, 50KRA POTENTIOMETER - VINTAGE FENDER AMP VIB INTENSITY , PEAVEY 5150 AMP 1M REPLACEMENT POT! 1 MEG AUDIO POTENTIOMETER, Fender 25K 30C Taper Snap In Amplifier Amp Potentiometer Pot 0047031000 NEW!, Alpha 8mm dual guitar amp effect potentiometer 50k lin, NEW - Alpha 3/8" bushing guitar amp potentiometer - 50KC 50K rev log, 10k linear bias potentiometer pot CTS-- fits Fender tube amps amplifier, CTS 1 MEG PUSH/PULL VOL TONE POTENTIOMETER GUITAR/AMPS , 3MRA POTENTIOMETER - VINTAGE FENDER AMP VIBRATO SPEED ,