I'm wondering if an Arduino with an H-bridge shield could be all the circuit you need. Plus a coil of course.
Do you have any links to discussions of pulse duration, frequency, intensity? Does it have to alternate - I.E. reverse polarity?
The fact the camera flash worked suggests that low frequency high intensity pulses work just as well.
Mike.
Let me post some links that dig into PEMF… a range of things. Much beneficial research…. anything you can derive and improve on.. well... tx for coming back with a query.
http://www.newmediaexplorer.org/chris/2009/02/19/build_a_low_cost_simple_magnetic_pulser.htm
http://www.diypemf.com/a-simple-pemf-device/
http://www.oskawellness.com/blogs/blog/10-facts-about-pemf-machines-and-what-they-can-do-for-you
**broken link removed**
http://pulsedenergytech.com/pemf/