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this looks great - what size magnets did you get? Did you just glue the tips of the magnet to the round hub and the rest is just hanging over?Rather than looking for smaller round neo magnets like I had in my old stir plate, I picked up 10x rectangular Neo magnets from a retailer on eBay (I can find specific details if anyone likes, cbf logging into eBay right now) for a decent price, was like $25 for 10 or something reasonable like that. A couple of CoolerMaster 120mm LED fans ($25/both), some PC fan speed controllers ($2 each!) and some tupperware containers nicked from the SWMBO's cupboard and they're basically done. I need to pick up some power sockets from Jaycar and i'm ready for a winter of Lagers!
Yeah they're just glued with Tarzans Grip, about 3/4 of the magnets are on the hub so plenty of room to hold them on.this looks great - what size magnets did you get? Did you just glue the tips of the magnet to the round hub and the rest is just hanging over?
excellent! thanks! ordered some 30mm x 10 x 4 so should do the job!Yeah they're just glued with Tarzans Grip, about 3/4 of the magnets are on the hub so plenty of room to hold them on.
The magnets are 25mm x 10mm x 3mm each.
Exactly these ones: http://www.ebay.com.au/itm/Buy-10-Neodymiu...d2ae&_uhb=1 Aussie seller.
I tried looking - want a box for a braumiser controller - but had trouble finding anything - would you mind linking?bullsneck said:I got mine (similar to geneabovil's above) from DSE online for half of what they are priced at Jaycar.
Mine does too - I thought it was going to be a big problem after I built it and made plans to try and insulate it, but I used it for the first time the other day and found that I barely noticed it over any other background noise in the house unless I was standing close to it.lael said:I used one of these: to reduce the speed, but have found that the fans make an annoying whining noise. Does anyone know why / have any suggestions?
cheers Edak! I looked into PWM - have you built a circuit for it? I actually got those fans because they are 4 pin and can take full PWM output. Ideally I would like to useEdak said:Looking good lael
If anybody else is having trouble with a fan not starting up or working at low speeds then consider making a pwm stir plate, reason is that pwm will still drive at full voltage but pulses instead, which ensures motor doesn't struggle
Mine was similar to the one you linked, I used a 555 timer but I don't think I used the diodes on the output. I can take a couple of photos for you if you would like...lael said:cheers Edak! I looked into PWM - have you built a circuit for it? I actually got those fans because they are 4 pin and can take full PWM output. Ideally I would like to use
this circuit to send a 'true' PWM signal to the fans, which would also eliminate the noise. But... my knowledge of electronics is scarce. Any pointers?
Edit - PS to the above post. stirbars in the picture are 70mm oval stirbars - also off aliepxress for $8ea - guy was nice and thew in a 50mm one for free too! . They are large enough that they recenter themselves if they get thrown and you turn the fan off.