Hi, Please have a look at this -> http://www.elv-downloads.de/service/manuals/UO100/53789_UO100_km.pdf
on page 4 you will find the schematic and you will get an idea. Regards, Christos SV1EIA --- In [email protected], Miura Kazunori <[EMAIL PROTECTED]> wrote: > > Hello > > thank you for your information. > I read this product. > > http://www.bb-elec.com/ > > But these equipment are not popular. > I think photo couppler IC's are using in this box. > It is same way of I2PHD's comment. > > best 73 > > JA7TDO > > Per-Tore Aasestrand ????????: > > > > > > Hi, > > > > There are opto-isolated USB hubs available. > > For example from or Black Box. > > > > Per-Tore > > LA7NO > > > > At 19:42 02.01.2008, you wrote: > > > >> Miura Kazunori wrote: > >> > Hello, Adnan > >> > > >> > I have same problem of thinking schematics. > >> > I am making SDR with USB control. > >> > A noise arrive through a USB cable. > >> > I think that it is necessary to insulate a PC and SDR. > >> > But I do not yet understand the method. > >> > Does anyone have idea? > >> > > >> > JA7TDO > >> > Kazunori Miura > >> > >> I had a similar problem when interfacing the SDR-X (an SDR radio > >> that did not enter into the market) to the PC via the > >> parallel port. A lot of noise entered the SDR through the parallel > >> cable. The solution was that of using opto-couplers > >> so that to not have an electrical path between the two equipments. > >> Maybe something similar could be designed for the USB > >> port > >> > >> 73 Alberto I2PHD > >> > >> > >> > >> > >> Yahoo! Groups Links > >> > >> > >> (Yahoo! ID required) > >> > >> mailto:[EMAIL PROTECTED] > >> <mailto:[EMAIL PROTECTED]> > >> > >> > >> > >> > >> __________ NOD32 2760 (20080102) Information __________ > >> > >> This message was checked by NOD32 antivirus system. > >> http://www.eset.com <http://www.eset.com/> > > > > \\|// > > /_"""_\ > > |(O) (O)| > > --------oOOO--(_)--OOOo--------- > > | | > > | Per-Tore Aasestrand | > > | E-mail: [EMAIL PROTECTED] | > > | Tel : +47 55 32 32 35 | > > | Mobile: +47 920 444 76 | > > | PO Box 1708 Nordnes | > > | N-5816 BERGEN | > > | Norway | > > | | > > -------------------------------- > > > > Only recycled bits have been > > used in this email. > > > > >
