Stephen R. Gregory wrote: > > Hey ya'll... Hey back, Mr. Steve! > You know that old saying; "Long lead goes in the square hole."?...not on this > board it don't...it bit me AGAIN! Dammit!! Why is it that there are a only a > very few board designers that go against the rest of the world when it comes > to going along with the same kind of polarity markings or conventions that > everybody else uses? It seems to be more with LED's too...this is not the > first time this has happened to me, and I'm sure it won't be the last. But > that's what it wuz... I suspect it starts with the schematic libraries. Have noticed that some schematic systems appear to call the Anode as pin 1, where most of us refer to the Cathode as pin 1. Of course, many (but not all) LED suppliers also call the anode pin 1, making the likely outcome so near 50% that we should ship a dentist's mirror with all prototypes that include an LED.... Oh, and if it has two colors, bank on the wrong one being lit. Go through this cycle enough times and you start to structure your product so you can change this in firmware. Thoughts to live by/with: - Always delete any and all vendor supplied library symbols, in CAE or CAD. Get 'em off the backups too, or "they're baaaaack" - When you're sure you have the LED correct, reverse it Signing off before more "design-isms" bubble out. G'year, -- Jeff Seeger Applied CAD Knowledge Inc Chief Technical Officer Tyngsboro, MA 01879 jseeger "at" appliedcad "dot" com 978 649 9800 ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################