Stir plate fan speed controller???

[jakbak]

This fan on amazon comes with a speed controller, used and old cell phone charger, and project box. http://www.amazon.com/gp/product/B00558OQ0W/?tag=skimlinks_replacement-20

 

[jerkbag]

Sorry to bump an old thread, but I can't get my LED dimmer to work for the life of me. I got this one

http://www.ebay.com/itm/DC12V-24V-8...s_and_Accessories&hash=item43c36500e6&afsrc=1

I simply wire + / - from Wall Wart to Input, and then Output to Fan, correct? Depending in Polarity it either doesn't spin at all, or spins at constant speed. Turning the knob does nothing. I'm using a 12V DC Wall Wart. Is it possible the unit is malfunctioning? This is a 4 PIN PWM fan, by the way, and I am just wiring 12V and GND out of the dimmer. Thanks!

 

[raouliii]

........I simply wire + / - from Wall Wart to Input, and then Output to Fan, correct? Depending in Polarity it either doesn't spin at all, or spins at constant speed. Turning the knob does nothing. I'm using a 12V DC Wall Wart. Is it possible the unit is malfunctioning? This is a 4 PIN PWM fan, by the way, and I am just wiring 12V and GND out of the dimmer. Thanks!

If you have a voltmeter, you might test the DC output voltage to determine if voltage is changing. The response of the multimeter should be slow enough that a variable DC voltage should be measurable.

 

[jerkbag]

If you have a voltmeter, you might test the DC output voltage to determine if PWM is functioning.

Yup I get ~12VDC steady throughout the range of the knob, which I believe is what a PWM should show (as I would guess the meter won't see the tiny pauses). Will take a closer look tonight. EDIT: Whoops didn't see the last part of your reply. Okay Dimmer must be faulty then voltage doesn't change.

 

[jerkbag]

I think I must have bought the wrong thing. With DC voltage input the dimmer stays steady at 12VDC, with AC voltage input it moves but only from 0 -> 2. With the former the fan spins full speed throughout out the dial range, the latter it buzzes but doesn't move throughout the whole range. I think I'm going to call it a loss and buy a 3 watt Pot.