On Tue, Jul 12, 2011 at 11:09 AM, Bob Blick wrote: > I suggest building one with an opamp and see if you like it: > > http://bobblick.com/techref/projects/preamp/preamp.html > > You can substitute your favorite opamp. > Nice. Nothing quite like a napkin schematic! --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .