For these racks, I believe the neodymium magnets are the most expensive portion.
It has been a long time since I built one, but I believe a 9V battery can provide current sufficient to produce a strong magnetic field - depending on how much copper you used.
If they have an on/off switch they could be plugged into a wall socket.
-SG
On Thu, Mar 29, 2018 at 1:41 AM Sergii Pochekailov <s.pochekailov@gmail.com> wrote:
Have you thought about doing them with an electromagnet?--That would be very nice to have, but I couldn't yet come up with an acceptable design. Commercial electromagnets cost quite a bit, and such rack would draw significant current.I'll definitely let you know if I come up with a solution.- Sergii
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