strange-steve
Quantum Brewer
- Joined
- Apr 8, 2014
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That's an exceptional bargain, well spotted!
Nothing obviously wrong there, does the fan work when connected directly to the power supply?
Nothing obviously wrong there, does the fan work when connected directly to the power supply?
Everything is correct as the labels on things say, I will try swapping things about tonight as well.Also, I suggest that you check the polarity because some potentiometers and 12v fans won't work if the 12v polarity is reversed.
That's an exceptional bargain, well spotted!
I bought one of these on eBay and works perfectly.The fan spins when connected directly to the power supply, so I guess the potentiometer is a dud.
I bought all the items from links near the start of this thread, wired them all up and my fan isn't spinning. There is a red LED that gets brighter and the plug makes a more intense, high pitched noise (although still fairly quiet) as I turn the knob but the fan doesn't start moving more than a small jolt, even at the highest setting.
Anyone any ideas? Here are some pictures, although there isn't much I could have done wrong (he says, before someone points out the obvious thing he has done wrong).
Cheers for the pointers, didn't read the whole thread. Will see if I have another fan...
Yep, I did and the other fan works fine with the potentiometer. Thanks for the help.
Guess it might be an idea to replace the fan linked earlier in the thread with another so noone else has the same issue?
Bought a new fan and everything is now working - still stumped as to why the original fan would work direct to power but not through PWM ???
This fan I bought from a UK seller, arrived in 2 days and is 3 wire (don't connect the yellow wire to anything, just use the red + and black - wires), 90mm 3pin selected: http://www.ebay.co.uk/itm/12v-SATA-...hash=item4867741bb5:m:mft5OtN-HX3j5kYt0gQES3g
Anyway, all sorted, will post pic later
Thanks for the explanation, so if a 4 wire fan is used rather than a 2 wire, connect the 12v + and - to the power supply, the pwm wire to the controller along with a +ve and -ve?
I doubt those ebay PWM controllers I see in the images posted here can be directly connected to the 4th pin because it's designed to accept a TTL 5V logic level and the PWM frequency should be 25kHz (see section 2.4 in the Intel spec). I've built a controller myself for 4 pin fans in the past but it's not suitable to show here because it's part of a much larger design.
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