I know i'm a little bit late, but i was on holiday... As to what Chris is saying: electric toothbrushes use inductive charging so that you don't have any electrical contacts... and they do it easy too... once opened u such a thing and only a few components.... Regards, Jilles Oldenbeuving jilles@rendo.dekooi.nl -----Oorspronkelijk bericht----- Van: Chris Carr Aan: PICLIST@MITVMA.MIT.EDU Datum: zaterdag 21 oktober 2000 19:15 Onderwerp: Re: [OT]: Inductive coupling >Inductive Coupling to transfer power is used in the real world. I believe >that it is used to charge some electric vehicles like forklift trucks, >pallet handlers etc >I have had a quick look at likely sources but not come up with any reference >sites. I believe that the system is also proposed for electric cars. If I >remember correctly the efficiency is not good, particularly when compared to >plugging in a cable. However, you do not have to remember to unplug the >cable before driving off !!! > >Regarding Signalling an On/Off instruction. > >Precisely what do you mean by "a few feet", I'm sure we have all been caught >out be imprecise phrases such as this :-) The speaker means 50 feet, the >listener assumes he means 2 feet. The result being a cock-up > >Inductive Coupling is one method, but has very limited range, If you want to >rule out RF such as 433MHz then how about using 40kHz Ultrasonic Transducers > >Regards >Chris > >> > Dear all, >> > >> > I still didn't get any replies about inductive coupling. Forget the bit >> > about battery charging, if you like :-) - perhaps if I phrase it >> > differently - how would you transmit an on-off switch signal a few feet >> > without using RF? (no infra-red etc. please!). >> > >> > Chris >> > -- >> > Dr. Chris Kirtley MD PhD >> > Associate Professor >> > HomeCare Technologies for the 21st Century (Whitaker Foundation) >> > NIDRR Rehabilitation Engineering Research Center on TeleRehabilitation >> > Dept. of Biomedical Engineering, Pangborn 105B >> > Catholic University of America >> > 620 Michigan Ave NE >> > Washington, DC 20064 >> > Tel. 202-319-6247, fax 202-319-4287 >> > Email: kirtley@cua.edu >> > http://engineering.cua.edu/biomedical >> > >> > Clinical Gait Analysis: http://guardian.curtin.edu.au/cga >> > Send subscribe/unsubscribe to listproc@info.curtin.edu.au >> > >> > -- >> > http://www.piclist.com hint: The list server can filter out subtopics >> > (like ads or off topics) for you. See http://www.piclist.com/#topics >> > >> > >> > >> > >> >> -- >> http://www.piclist.com hint: The PICList is archived three different >> ways. See http://www.piclist.com/#archives for details. >> >> >> >> >> > >-- >http://www.piclist.com hint: The PICList is archived three different >ways. See http://www.piclist.com/#archives for details. > > > > -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu