1. You can buy one online from your favorite electronics site (but this will cost you an arm and a leg).
2. You can take your chances with a massager from the Goodwill Store (but who knows where that has been).
3. Or if you have five minutes to spare, you can build your own.
Not liking to spend great deals of money or break out in strange rashes, I prefer option number 3.
Step 1: Go get stuff.
- DC motor with a plastic gear attached to the shaft (easily found in tape players, VCRs, printers, etc.)
- An alligator clip
- Soldering iron
- Some solder
Step 2: Attaching the weight.
Since a vibrating motor is just a weight attached off-centered to a motor shaft, you are theoretically done.
Before you turn it on and possibly lose a perfectly good eye when the clip goes flying off, you should think about reinforcing the alligator clip's grip on the gear (as we will do in the next step).
Step 3: Attaching the weight better.
First, make sure that the clip can rotate around the motor shaft without catching on to any parts of the motor.
Once you are sure of this, turn on your soldering iron and wait for it to get very hot. Once hot, hold it to the alligator clip for about 20-30 seconds. This should be more than enough heat to melt the clip's teeth into the plastic.
After heating up the clip, carefully without touching the alligator clip and burning yourself, solder the top and bottom half of the clip together at the side hinge. This will prevent the clip from being able to open up.
It now should be melted and permanently clamped into place.