On Sun, Mar 28, 2010 at 3:18 PM, Richard Prosser wrot= e: > On 29 March 2010 05:11, Peter wrote: >> PS: I recently found this gem: http://www.wenzel.com/pdffiles1/pdfs/crvc= o.pdf >> which is a coil saturation and variable capacitance tuned VCO. It is very >> intersting. Even more interesting is the fact that I found two pat= ents >> from 2009 and 1998 which claim to patent saturation controlled inductanc= e using >> an electromagnet. One is US and one is from Australia. Obviouly a patent >> examiner cannot be expected to know that saturation based inductance con= trol was >> a breakthrough in circa 1890, and led to over 50 years of magnetic ampli= fier >> systems being used all over the world and technology. Numbers and refere= nces are >> available upon request. >> >> > > Peter > > Magnetic amplifiers are in still in widespread use. > If =A0you look at most modern PC power supplies, they use a magnetic > amplifier for the 3V3 output IIRC. Richard, I am pretty sure that Peter was being sarcastic. Sean > > RP > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist