How to build a stir plate for less than ten quid

Discussion in 'Beer Brewing "How-To" Guides' started by strange-steve, Sep 12, 2016.

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  1. Mar 24, 2019 #361

    mitchmalt

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    Chuffed with my mornings work! Thanks Steve for the guide. I had been borrowing one from work, but this is much more satisfying and totalled less than £7 with some bits found in the garage. Still ‘borrowing’ the conical though!
     
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  2. May 18, 2019 #362

    Oneflewover

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    Decided to upgrade my stirplate from the roses tub. Dad was getting rid of some electrical bits and bobs so I took this box off his hands. Works a treat and is very compact and tidy athumb..
    IMG_20190518_151116765.jpg
     
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  3. May 20, 2019 #363

    BeerCat

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    What size is the box?
     
  4. May 20, 2019 #364

    Oneflewover

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    About 4x6x2.5". The fan just fits underneath the lid - I glued it in place and there is just enough room for it to spin with the magnets. The flask is wider than the stirplate but that's not a problem. It's a good upgrade on what I had athumb..
     
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  5. Jun 19, 2019 #365

    Justin Dean

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    When i connect the fan straight to the 12v supply it spins away happily. but when connected through the 12v controller form the link you put up, nothing doing.....must be a dud. I have checked everything else.

    Ordered another one and see if that works
     
    Last edited: Jun 19, 2019
  6. Jun 19, 2019 #366

    Dutto

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    I know this sounds daft, but have you got the Regulator connected with the right +/- polarity?

    I think (though I have been known to be wrong) that most Regulators need the polarity to be connected in the right direction for it to work; whereas connecting a 12v fan directly to a 12v source will just make the fan turn in a different direction if the polarity is reversed.

    If you find I am correct, then you will have a spare Regulator when the new one arrives! athumb..
     
  7. Jul 8, 2019 #367

    Justin Dean

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    It is all connected right, , Regulator has power as red light on and fades and brightens as I turn knob. . No idea why it is not working. With knob on full and when power connected the fan sort of shudders but that is it
     
  8. Jul 8, 2019 #368

    Justin Dean

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    Any ideas?
     
  9. Jul 8, 2019 #369

    Oneflewover

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    What's the voltage output from your power supply? I found different voltage outputs made a difference in the speed of the fan even with the regulator
     
  10. Jul 8, 2019 #370

    Justin Dean

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    15626068578127743929307228786468.jpg 15626069032847378983050592471139.jpg 12v 3 amp
     
  11. Jul 8, 2019 #371

    Justin Dean

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  12. Jul 8, 2019 #372

    Justin Dean

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    Sorry 12v 2 amp
     
  13. Jul 8, 2019 #373

    Oneflewover

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    Dunno then mate, looks pretty much the same as my set up. Sorry.
     
  14. Jul 8, 2019 #374

    Justin Dean

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    Thanks anyway. I have tried two now. Will try a different fan though this one is perfectly happy connected direct to plug.
     
  15. Jul 8, 2019 #375

    Dutto

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    Maybe .... ?

    I've only EVER used a 12v battery as a power source!

    I use an old (at least fifteen years) battery from my Mum's scooter. As the battery depletes the spinner slows down and I have to adjust the regulator to keep the speed up.

    Maybe the 12v regulator shown in the photograph isn't giving the regulator enough "oomph" so I suggest that you try using a 12v battery instead.
     
  16. Jul 9, 2019 #376

    strange-steve

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  17. Jul 9, 2019 #377

    Drunkula

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    When you link it up to the power supply directly does it spin mad crazy fast, literally throwing itself around on the table, like a pc when you're using loads of CPU? If it doesn't the power supply might not be outputting at full power any more. I've had that happen a few times.

    Have you got the specs on that pwm controller? It's got a heat sync on it so it might be a 6v up to 24v one. That you see it judder suggests it's getting voltage but not enough to make it spin so the pwm might be soaking up just enough so that fan doesn't run if the power supply is running short. I'm guessing you don't have a multimeter.

    I'm using a 1.8v -> 12v one and anything about 4 volts will get my fan working. I use it with a selectable voltage transformer.
     
    Last edited: Jul 9, 2019
  18. Jul 9, 2019 #378

    Justin Dean

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    Thanks all. It is something like that . I will examine. Bloody useless on this. I just followed the links on the thread
     
  19. Jul 10, 2019 #379

    foxbat

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    At 100% it should work more or less as if it's plugged directly into the supply since the PWM output should be DC. Unfortunately I would need my oscilloscope to tell you what's actually happening.

    My opinion of any level less than 100% is that it shouldn't work at all and the PWM output should be averaged to DC with a capacitor but the experience in this thread shows that most fans are tolerant to the abuse.
     
  20. Jul 10, 2019 #380

    Justin Dean

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