See in particular chapter 15. On 2/10/2017 9:42 PM, Richard Knoppow wrote: > Electronic regulator. For much more see the book at > http://tubebooks.org/Books/efce.pdf > > Electronic Designers Handbook, Robert Landee, Donovan Davis & Albert > Albrecht, 1957 > -- Richard Knoppow 1oldlens1 at ix.netcom.com WB6KBL