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Variable Voltage

Can anybody please recommend a variable voltage regulator that I can purchase to test out variable voltages when building an electromagnet?

Electromagnetic Linear Actuator Idea

G'day all.

I've been trying to think of a silent linear actuator, that is:

   - Quick or slow to move.
   - Offers precise movement.
   - Silent.
   - Run off electricity (ie: not on hydrolics).

I have found this video which looks like the closest to the above requirements:

See the electromagnetic fields around you
Senses the level of electromagnetic fields around the device and displays the intensity on the LED bar graph.  I designed this PCB after reading the make magizine … Read more