In a message dated 08/16/2006 09:49:53 AM Eastern Daylight Time, mrfixit at min.midco.net writes: > Yes, it's in the verbage of the patent, page 2, column 3, line 17. > > http://www.pat2pdf.org/patents/pat3060389.pdf > > Dave Dunsmoor 7 Hy and .03 uF, all. 7 Hy coils would be a little bulky. I think I'll stick to the op-amp version, thanks. Willie...