I understand how you would do this with an op amp - what is a "virutal ground" device? Part numbers? --Lawrence ----- Original Message ----- From: "Reginald Neale" To: "Lawrence Lile" Sent: Saturday, February 02, 2002 9:14 AM Subject: Re: [PIC]: Driving a dual LED > Lawrence: > > Instead of using a resistive divider that draws current all the time, > can't you use one of the "virtual ground" devices to establish your > voltage midpoint? Or use a CMOS op-amp to set it to any voltage you > want. Granted, this is extra cost and complexity. > > Reg -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body