This was one of the easier and more fun projects that I've completed.
I got the project box, a switch, potentiometer, and a female power plug from Radio Shack and the rest scavenged from around the house.
Parts List
Project Enclosure (8x6x3")
25-Ohm 3-Watt Rheostat
Rocker Switch
Fan from Computer Power Supply
Magnet from Hard Drive
Stainless Steel Washer (don't know size)
9V Power Plug from old cell phone
4 Screws, 8 nuts, 4 nylon spacers, and some washers
Some wire (~ 2 ft)
I drilled up the project box for the power plug, switch, and rheostat, then soldered everything up as shown in the pictures below.
I had 4 machine screws and some matching washers and nuts lying around the garage. I had to slightly drill out the holes in the fan for these to pass through.
I used the stainless steel washer as a spacer to keep the magnet off the fan. You have to use a non-magnet spacer here otherwise the magnet will interfere with the fan. I attached the washer to the fan with industrial velcro and the washer is glued to the magnet. This allowed me to adjust how the magnet/washer sat on the fan to better center it. If its not centered well, you the stir bar is more easily thrown.
I have a 2" stir bar that I want to trade out for a slightly smaller one.
I got the project box, a switch, potentiometer, and a female power plug from Radio Shack and the rest scavenged from around the house.
Parts List
Project Enclosure (8x6x3")
25-Ohm 3-Watt Rheostat
Rocker Switch
Fan from Computer Power Supply
Magnet from Hard Drive
Stainless Steel Washer (don't know size)
9V Power Plug from old cell phone
4 Screws, 8 nuts, 4 nylon spacers, and some washers
Some wire (~ 2 ft)
I drilled up the project box for the power plug, switch, and rheostat, then soldered everything up as shown in the pictures below.
I had 4 machine screws and some matching washers and nuts lying around the garage. I had to slightly drill out the holes in the fan for these to pass through.
I used the stainless steel washer as a spacer to keep the magnet off the fan. You have to use a non-magnet spacer here otherwise the magnet will interfere with the fan. I attached the washer to the fan with industrial velcro and the washer is glued to the magnet. This allowed me to adjust how the magnet/washer sat on the fan to better center it. If its not centered well, you the stir bar is more easily thrown.
I have a 2" stir bar that I want to trade out for a slightly smaller one.