On Sat, 14 Dec 2002, David & Ann Scott wrote: *>> Not quite. If you refer to the core, it has to do with the switching *>> frequency, not with the blink frequency. I hope that I understood what you *>> asked ... *>> *>> Peter *> *>I think I'm wondering whether the two frequencies are the same. I went back *>and reread RMs comments *>(http://www.piclist.com/postbot.asp?id=piclist\2001\09\27\023449a ) and *>found the following: "When C is made large (say 1 uF range) the frequency *>of operation will be so low that individual output pulses will be *>individually distinguishable.". That says they're the same doesn't it? Yes, I had not followed the circuit you are using. It seems that the frequency is as you say very low. However since it works, it works ;-) Peter -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.