On 11/12/07, Vasile Surducan wrote: > On 11/11/07, Peter P. wrote: > > Anyway I > > would like to use the LED as a voltage reference at constant current. > > If you'll live in 1980 you can do it, but in 2007 you may find so many > bandgap references that your question is funny. Ah I missed that line. I agree with you. Even the 10Fs now have a not-so-good bandgap references now. Xiaofan -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist