|HOWTO: DIY Stir-plate for Homebrew Yeast Starters|
I drilled my holes for the potentiometer and the switch on the 5" x 3" side of the project enclosure to allow for more mounting space for the fan. Mount them up using the enclosed hardware that came with both of them. I also drilled a hole on the bottom corner of the enclosure to run the power supply out of the box.
Wiring Overall View
First things first: Wiring-
Get your Black and Red computer fan wires stripped. If you aren't soldering, put a female quick disconnect onto the Red wire.
Next, cut off the power supply “phone” side and try to keep the power cord going to the wall socket as long as possible. This just makes things easy if you make a mistake. Some phone chargers will have two wires, while others I've found have a “braid” going around another insulated wire. The “braid” is our ground or negative and the inner cable is your power side. For the chargers with 2 single wires inside, black is your ground.
Strip about 1/4” of the insulation off your wires. Take the black cable of your computer fan and the black cable of your power supply and twist the exposed wire together and insert them into one of the female quick disconnects. Make sure that you have already put your power supply cable through the hole you drilled in your enclosure before making this crimp or you won't be able to close your enclosure when you are done. Connect these two wires to the “Earth” male connector on your power supply.
Now, take your Red cable from your power supply and add a female disconnect onto this cable and attach it to the “male” terminal on your power switch labeled “Supply”
We are ALMOST done with all the wiring. The only male terminal left on our power switch is the one labeled “Load”. Take some of the spare wire, about 4-5 inches, and strip off the insulation from each end. Attach a female disconnect to each end. Now, attach one side of the wire onto the “Load” terminal on your power switch, and the other to the center pin of the potentiometer.
The last step is to take the “Power” cable (red) from your computer fan and attach another female disconnect. Attach this disconnect onto the right side pin on the potentiometer.
Power Switch Wiring