I'm building a head popper but have a 12V power supply which is too much juice. Is there any way to slow down a wiper motor or do I need to buy a 5V or 3V power supply?

Thanks

not sure if this will help you any....
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Are you connecting to the slow or the fast terminal? If you're already on the slow terminal, then no. If you're on the fast...try switching to the slow.

So, if you have connected to the two terminals that are essentially at opposite ends (one is the second terminal in and the other is at the far end), then you can step down the speed by switching the wire connected to the far end to the terminal at the other end (closest to the ground terminal), so that you have the two wires connected side-by-side.

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That worked. Thanks for the advice.
Elpitchfork

I have also seen the motor speed slowed by changing the position of the black case over the motor. This moves the magnets and requires the two screws holding the case to be removed so you can twist the case.