Stir plate

[quaff_an_ale]

Want to build a stir plate. Have a 12v DC 850ma fan from computer (3 wires, red, black, white) , power via AC Adapter with output of 12v DC 830ma.
Hooked black from AC Adapter to black of fan and white striped wire from AC Adapter to red of fan to test fan. Fan spins moderately. Is it safe to assume fan is toast? And what happens with fan's third wire (white)?

Thanks.

 

[quaff_an_ale]

Here are photos of what i have to use.

 

[day_trippr]

That ain't gonna work.

Note the "Output: AC 12V 830mA Max 10W" printed on the wall wart.
Your fan wants DC, the wall wart output is AC. Game over.

If you want to stick with that (remarkably inefficient) DC fan you want a wall wart with an 12V DC output and a 1 Amp rating. Add a 25 ohm pot from RatShack and you should be good to go...

Cheers!

[edit] Missed your other question: one of the wires is a fan tachometer output. If you got it to move at all using the black and red, then the white wire is the tach output. You don't need that to spin the fan...

 

[quaff_an_ale]

Thanks.
Found a 9v DC output plug/transformer. Works now.

 

[chisena]

Here's my plate...