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- Mar 22, 2019
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I will try a 1.8v -> 12v one instead
I've built one of these using this Potentiometer:
https://www.ebay.co.uk/itm/DC-Motor-1-8V-3V-5V-6V-12V-PWM-Speed-Controller-2A-Potentiometer-Knob-Switch-SF/362720085707?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649
When I connect it to the fan, it doesn't turn unless I turn it up to full power, and this is a bit too strong to keep the stirbar centred. I have tried both of the following fans with the same result:
https://www.ebay.co.uk/itm/92-x-92-x-25mm-DC-12V-2Pin-65-01CFM-Computer-Case-CPU-Cooler-Cooling-Fan-K4-O7C0/283440840478?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649
https://www.ebay.co.uk/itm/90-x-25mm-9025-2pin-12V-DC-Brushless-PC-Case-CPU-Cooler-Cooling-Fan-V1L4-X7-H5X4/302933311172?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649
Any ideas? It has a light on the Potentiometer and this changes as you turn the knob so it appears to be working. If I reverse the polarity of the fan it never turns.
Cheers!
Yeah, I've tried that loads with both fans and it's always off or too fast. Thanks though.mine is similar in that you have to turn it all the way up to get it moving, but as soon as you get that initial movement you can turn it back down before the speed gets too high.
I myself would love a stir plate my local homebrew shop dont sell them.
I have many computer fans,So this might become a project over the oncoming long,long Scottish winter months.
That looks the businessSo happy I stumbled across this thread! I've just ordered my bits two days ago and already up and running! Cost all in with the flask was £40! I even added some little shock absorbent feet.
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