On 6/26/2011 9:29 AM, RussellMc wrote: It's been too long since studying or using any semiconductor theory. Is=20 q =3D electron charge a constant? I know the rest are, except for the=20 ideality factor, which I would hope are in the spec sheet or can be=20 calculated empirically. Also, in your math notation, as in: > Delta Vjn =3D K.T Is t he . dot a multiplication, what I would expect to be '*'? Joe W --=20 Joe Wronski Stillwater Embedded Engineering www.stillwatereng.net --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .