foxtrot
Well-Known Member
Need some help from those that are electronically inclined...
I am in the midst of building a stir plate and the problem I'm having is too fast of a fan. Here's my components:
12V / 2.8W 92mm fan
Magnet from hard drive, centered on fan hub
9V, 300mA AC to DC wall adapter
25 ohm, 3W pot
(got the plans from onebeer.net)
I'm trying to spin a 2" stir bar in a 2L flask. The bar starts spinning, then spins out as the fan revs up. The pot does not slow it down enough. I'm not into soldering and don't have much experience w/ electronics, so I'd like a "simple" solution.
Here are two ideas I have:
1) reduce the input voltage by getting a universal wall adapter that adjusts from 1.5 to 12V, in 1.5V increments (btw, these come in various mA ratings- as long as it exceeds the fan, I'm good, right?)
-or-
2) get a fan speed controller
Which method would work better or should I be trying something else???
Many thanks in advance!
I am in the midst of building a stir plate and the problem I'm having is too fast of a fan. Here's my components:
12V / 2.8W 92mm fan
Magnet from hard drive, centered on fan hub
9V, 300mA AC to DC wall adapter
25 ohm, 3W pot
(got the plans from onebeer.net)
I'm trying to spin a 2" stir bar in a 2L flask. The bar starts spinning, then spins out as the fan revs up. The pot does not slow it down enough. I'm not into soldering and don't have much experience w/ electronics, so I'd like a "simple" solution.
Here are two ideas I have:
1) reduce the input voltage by getting a universal wall adapter that adjusts from 1.5 to 12V, in 1.5V increments (btw, these come in various mA ratings- as long as it exceeds the fan, I'm good, right?)
-or-
2) get a fan speed controller
Which method would work better or should I be trying something else???
Many thanks in advance!