Tech Forum

June 2014

Renewing Permanent Magnets

I have an old style hand crank telephone generator. It works, but output voltage is low due to the four horseshoe magnets it uses being weak. What is the best way to revitalize these magnets to bring the generator back to like-new operating condition?

Also, how can I tell when — as a result of the revitalization process — the magnets have achieved maximum strength and won't get any stronger?

#6145
David LeFevre
Ontario, NY