After some more research it appears that the GIF I posted is correct for 2N2222. Aparently there are 3 common configurations for these types of transistors (and then others as well). One pinout (the one which got me confused in the first place) is for the BC type of transistor apparently common in Europe, another pinout is the 2N type (the kind I have) which is more common in North America, and then another for Japanese transistors or something. So it appears there is no real standard pinout for NPN transistor in the TO-92 package and it varies by manufacturer. It's still pretty wierd that my RadioShack packaging had a different pinout than the regular 2N2222 pinout (as per Eagle Layout Editor). I think the biggest confusion came up because many of the schematics/pcb layouts I've seen on the net use the BC type of transistor and suggest the 2N type as a replacement (without any notice of the different pinouts). Is this right? or am I still totally confused? MJ Brush ----- Original Message ----- From: "Matthew Brush" To: Sent: Saturday, June 05, 2004 3:00 PM Subject: [EE:] Simple Transistor Question Hi all, Something has been bothering me for a while. I know there was recently a question posted about transistor pinouts, but I was still left with mixed answers on this. I have attached a (crappy) drawing I quickly made in photoshop to go with this question. The package of 2N2222 transistors I bought from RadioShack has pinouts on the back which seem to go against what actually works for me, and is also the opposite of how Eagle Layout wires the transistor (from a schematic->make board). Eagle wires it the way that is in the picture, which is also how I've been wiring it all along. It seems these transistor will work in either direction, but as I'm soon to be attempting an audio circuit (as opposed to the usual turning on a relay or whatever), I want to make sure I have it right. Is this circuit in the attached GIF correct, labelled properly and whatnot? I would assume that the collector "collects" electricity and when the base is positive, the emmitter "emits" electricity towards ground. But it seems like I'm getting confused going from the schematic to the actual circuit. Thanks for any clarification anyone can offer as to why i see these standard NPN transistors wired differently (ie backwards) sometimes and not others. Peace MJ Brush -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads