Yeah, it's working because it has been reverse biased, but it should not be as bright as if it were in the correct way. -Shawn Tan Chun Chiek wrote: > If i still remember correctly, a BJT will work in reverse active mode when > you swap its collector & emitter. In this mode, current that powers your LED > still flow into the emitter and out to the collector, but at a percentage of > the base current which now flows to out to the collector too. > > Regards, > Tan Chun Chiek > > ----- Original Message ----- > From: "Matthew Brush" > To: > Sent: Sunday, June 06, 2004 3:58 AM > Subject: Re: [EE:] Simple Transistor Question > > > >>The wierdest part is that the 2N2222's I have work in either direction, > > that > >>is, with that LED circuit I posted. That only adds to the confusion. So > > I > >>guess from now on, I'll just order my transistors from Digikey and go by > > the > >>datasheet of the specific model. >> >>Is it normal for a transistor to "work" in either direction? My > > assumption > >>is that they CAN be reversed (C & E) but are supposed to be used in a >>specific direction. >> >>Thanks for the clarification guys. Peace >> >>MJ Brush >> >>----- Original Message ----- >>From: "rixy04" >>To: >>Sent: Saturday, June 05, 2004 3:36 PM >>Subject: Re: [EE:] Simple Transistor Question >> >> >> >>>You cannot arbitrarily swap pinouts. It will only work in one >> >>configuration. Just because the Radio Shack packaging says one thing > > doesn't > >>make it right. Sometimes when the vendor prints the drawing they may look > > at > >>it from the top or the bottom. It will only work one way. >> >>>Also be aware that the flat side may or may not be the same on different >> >>manufacturers package. An example is the BS170 and the BS170P. The lead >>configuration is SGD or DGS. >> >>>You have the right idea as far as your drawing goes. Look at this page > > for > >>other suggestions: >> >>>http://www/pic101.com/interface.htm >>> >>>Rick >>> >>>Matthew Brush wrote: >>> >>> >>>>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 > > > -- > 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