At 2:00 PM 10/21/4, [EMAIL PROTECTED] wrote: >In a message dated 10/21/2004 12:07:05 PM Eastern Standard Time, >[EMAIL PROTECTED] writes: > >> The subject, though, was 100 GHz rectification and power supply size. My >> point was that FETs overcame the drop in efficiency of diodes at high >> frequencies, but FETs too have their limitations and drop off in efficiency >> with frequency. High power switching at 100 GHz to achieve any kind of >> practical current rectification is a problem for a tiny power supply. >> >> > >Remember the power transformer that used to be in old radios and television >sets. You will not find one now. Where did it go? These devices still >require a multitude of voltages. In televisions the power line frequency is >unshifted and then ran through a light small light weight transformer. It >looks >more like a tuning coil than a transformer. The is done because the inversion >electronics are cheeper than transformer iron. Much smaller filter capacitors >are required at high frequency. > >Frank Znidarsic
I hear tea in China is getting more expensive these days, due to their holding massive reserves in dollars which are depreciating. Regards, Horace Heffner
