Yes, it looks like we have a winner.... I thought it was from around 1995 in the back of my head.... Make sure you hit the "back" button on the bottom of the schematic to see the accompanying text.... Cheers, Jeff R. Dec ----- Original Message ----- > Was this the one??? > http://archives.e-insite.net/archives/ednmag/reg/1995/011995/graphs/02di1fg1.htm