On Mon, 14 Jul 2008 18:44:07 +0100, "Tom=E1s =D3 h=C9ilidhe" said: > If Microchip says 25 mA is the upper limit then we're probably grand up = > to about 30 mA or so. On the prototype board for my Connect4, I went = > straight from a PIC pin to an LED to ground, without a current-limiting = > resistor. I left the device on overnight for three nights in a row and = > it didn't fail! For the craic I might cut one of the LED legs out to = > definitively measure the current flow. Also note that I had 7 LED's on = > at once, so not only was I flouting the "per pin" rule, I also flouted = > the "all pins" rule! And it still managed to stay working for 3 nights = > in a row! Yes, Tomas, you can run it at whatever current level you feel comfortable with. That's just fine with all of us. However, if we were designing it, we apply our own special rules which tend to keep things below the absolute maximum ratings and probably closer to 8.5mA sink, 3mA source per pin. But since this is an "eXtreme" product, we suggest you use eXtreme values! In other words, I get the feeling you just want everyone to say "go ahead, great design" and won't give up until you hear that. So let me be the first to say "go ahead, great design" :) Cheerful regards, Bob -- = http://www.fastmail.fm - The way an email service should be -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist