On Thu, Feb 19, 2009 at 10:22 AM, Benjamin Grant wrote: > Yes, I agree, I'm going to remove U2, it serves no purpose. Secondly, I do > understand a transimpedance amplifier, as seen in stage one, and I'm sorry > for drawing an extra wire to ground, but once removed as in the > updated schematic > I don't > believe there are large problems with the transimpedance amplifier. > You cannot get -1.5V, 0V, 1.5V and 3V from a pair of cells -- that's 4.5 V total. Something is wrong with your grounds or power supply. Maybe add the cells to the schematic to show how they are connected. Regards, Mark markrages@gmail -- Mark Rages, Engineer Midwest Telecine LLC markrages@midwesttelecine.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist