indi quote:
[A wall wart is a power supply transformer and mains plug in one unit.]
-I've done it again, I meant to say AC/DC converter, if that's what a wall
wart is then that's it indi.
[Hopefully there's still a part number on the fan. If so, you can google the
specs and find the rpm and voltage ratings. Of course, you could also just
use a potentiometer to vary the voltage and eyeball it. Very generally, I
think the spec will usually be something like 12k to 20k RPM at 5VDC (I
can't remember the amperage, but a quick check of a
compatible computer power supply will give you that) for many computer case
fans.]
-That gives me something to work on, thanks. That's a common old volume
control knob or rheostat isn't it? Yeah, I may just play around with one of
those and have a go at that, what with my 'skills' in electronics <g> I
shouldn't have too much trouble hooking up a multimeter to check voltage at
different settings or positions. Just had a thought, if I can find a
counter of some sort I can just stick a match or something to one of the fan
blades and hold the counter to it and find out that way, well dependant on
how hard the counter 'clicks' around that is. Good thinking 99.
[BTW, you may find the torque required to move an object through liquid to
be too much for that kind of motor, but I could be wrong about that. Shaft
balance is a big deal for the bearings, too.]
-Nah, they work fine indi, I've made several using the magnet out of the
hard drive and the fan as the stirrer motor. I think the lowest setting on
the adapter I have is 3.5v which is not enough, (you're sort of half right
there), the lowest which works is 4.5v. Now I just use a straight 9.3v one.
There's a lot of talk about stirring speeds but I'm happy with 9.3v, besides
I haven't got the patience for weeks of testing various voltages anyway so I
put the variable one back in the draw, may play around with voltage, (for
spinning speed), again one day though and take some notes on resultant
solutions.
The tricky bit is locating the magnet central on the fan so the fan doesn't
self destruct over time cos of excess wobble, (which would be your 'big
deal' concerning the bearings), I've been using one now for around 8-10
months and is still an excellent magnetic stirrer, hasn't self destructed
yet. I've been checking out speaker magnets to see if they would work also
cos they are round, but the speakers I have ripped apart have magnets which
I think are too thick, the hard drive ones are thin but have a very strong
magnetic field.
Cheers...N.
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