On 9/21/06, DJ Delorie <[EMAIL PROTECTED]> wrote:
Been thinking about what it would take to convert to all 3.3v (outside the last stage I/O drivers) in the furnace project. I was thinking how hard it would be to get mosfets with a small enough Vgs for my last I/O port plan (Vgs would need to be less than 1v) when it occurred to me that I can use the high Vgs to my advantage. Checking a few random mosfets, it looks like turn-on starts around 1.5v and really kicks in around 2v. 2v is more than half of 3.3v, we just need a little more drop to keep the 1.5v above it also. Consider this schematic:
Why couldn't you replace the diodes with shorts and use BJT's rather than MOSFETs? (* jcl *) -- http://www.luciani.org _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user