There is enough material on the net to suggest that Pulsed Electromagnetic Therapy MAY just work to relieve arthritic pain.
I am not convinced enough to spend US$1200 or so for a commercially produced machine, but I believe it should be reasonably easy to build one. I am thinking a PICAXE driving a FET switching a 12V supply through a coil of around 45cm diameter.
The problem is how to calculate the number of turns and the current required through the coil to produce the required field strength ?
The strengths I have seen quoted are: 2.74 x 10(-7) to 3.4 x 10(-8) G. I presume the 'G' is for Gauss. I have also seen a figure of 25 Tesla.
I would also like to measure the produced field if at all possible, just to confirm that it is in the ballpark.
I will be grateful for any help with this.