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Old 22-04-2017, 05:15 AM   #181
JapanBrew
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Did you try reversing the polarity? Internally the pot might have been made wrong.
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Old 22-04-2017, 12:41 PM   #182
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Did you try reversing the polarity? Internally the pot might have been made wrong.
I think the polarity is correct, using the multimeter on the output connectors of the PWM, with red probe on + and black probe on - the multimeter reports 11.98v, if I swap the probes the other way round then I get - 11.98v (ie minus).

So think polarity is correct.

Really stumped !
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Fermenting:
Czech Pilsner take 2 with Cascade, NEIPA take 2 with Cascade, Centennial and Simcoe.

Conditioning:
Nowt.

Drinking:
Czech Pilsner with Saflager W-34/70 yeast., NEIPA with Mosaic/Simcoe/Galaxy, Amarillo/Centennial Red Ale, Timothy Taylor Landlord.
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Old 22-04-2017, 03:07 PM   #183
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Well, that's all I had. You won't hurt the fan to just flip the wires.
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Old 22-04-2017, 05:08 PM   #184
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Finally put mine all together in a box, and here it is! I've got the controller blutacked to the bottom because I didn't have any shorter machine screws to fix it down. Maybe something for another day. I'm going to stick some rubber tape on the top so my flask is more stable when it's switched on. It'd be nice if you could calibrate the controller so you had more control than just the top 90% of the dial, but all is good for less than a tenner! Thanks for posting the instructions.
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Old 22-04-2017, 05:41 PM   #185
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Finally put mine all together in a box, and here it is! I've got the controller blutacked to the bottom because I didn't have any shorter machine screws to fix it down. Maybe something for another day. I'm going to stick some rubber tape on the top so my flask is more stable when it's switched on. It'd be nice if you could calibrate the controller so you had more control than just the top 90% of the dial, but all is good for less than a tenner! Thanks for posting the instructions.
Neat job. What size fan did you use? I bought a 120mm but its very slow and wobbles all over the place. Should of bought a better quality one.
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Old 22-04-2017, 06:04 PM   #186
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I used the one linked on the first page, so it's 92mm. Fits perfectly in the box I used. When I tried it out the stir bar kept flying out of reach of the magnets, but I put another couple of magents on top so it should be fine. The fan is fixed at the top of the machine screws.
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Old Yesterday, 12:10 PM   #187
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Totally stumped now

Measured with multimeter, input into pwm is 12.02v and output to fan is 11.98v with dial turned right up. Dial turned right down output to fan is 1.5v.

So pwm appears to be working correctly I think. Connected fan to power and it spins but wired back through pwm and it gives a little nudge around 70% but won't spin!

Connections look good, polarity and solder on back of pwm looks fine.

Any ideas chaps?
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-M...X3j5kYt0gQES3g

Anyway, all sorted, will post pic later
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Fermenting:
Czech Pilsner take 2 with Cascade, NEIPA take 2 with Cascade, Centennial and Simcoe.

Conditioning:
Nowt.

Drinking:
Czech Pilsner with Saflager W-34/70 yeast., NEIPA with Mosaic/Simcoe/Galaxy, Amarillo/Centennial Red Ale, Timothy Taylor Landlord.
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Old Today, 08:12 AM   #188
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Heres a quick pic of mine now its all working - I only made the stir plate, we bought the slow cooker from Argos
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Fermenting:
Czech Pilsner take 2 with Cascade, NEIPA take 2 with Cascade, Centennial and Simcoe.

Conditioning:
Nowt.

Drinking:
Czech Pilsner with Saflager W-34/70 yeast., NEIPA with Mosaic/Simcoe/Galaxy, Amarillo/Centennial Red Ale, Timothy Taylor Landlord.
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