This is a "flying capacitor" analog isolator. As I recall, Maxim makes a chip that does this. Harold On Fri, 29 Oct 1999 11:28:36 +0100 fernteix writes: > Hi > > Use the same idea with analogue swiches. > > fernando > > -----Original Message----- > From: Andy Kunz > To: PICLIST@MITVMA.MIT.EDU > Date: Quinta-feira, 28 de Outubro de 1999 21:00 > Subject: Re: [PIC] Measuring Analog Voltages w/o Sharing Grounds > > > >At 12:22 PM 10/28/1999 -0500, you wrote: > >>A simple technique requiring a capacitor and DPDT relay: > >> > >>Vx+ >----o | o-----> AtoD > >> | > >> +-)(-+ > >> C | > >> +----+ > >> | > >>Vx- >----o | o-----> GND > > > >I need to make up to 30 samples/sec. That's a pretty nasty buzz > for a > relay. > > > >I like the concept, though. > > > >Other ideas? > > > >Thanks. > > > >Andy > >================================================================== > > Eternity is only a heartbeat away - are you ready? Ask me how! > >------------------------------------------------------------------ > >andy@rc-hydros.com http://www.rc-hydros.com - Race Boats > >andy@montanadesign.com http://www.montanadesign.com - Electronics > >================================================================== > > ___________________________________________________________________ Get the Internet just the way you want it. Free software, free e-mail, and free Internet access for a month! Try Juno Web: http://dl.www.juno.com/dynoget/tagj.