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2000-12-07 by John E Blacet
With regard to that emitter arrow, a helpful mental trick is to think of NPN as "Not Pointing iN" and PNP as "Pointing iN ...". -- Regards. ------------------------- John Blacet Blacet Research Music Electronics http://www.blacet.com ------------------------- blacet@... ------------------------- Are you on our mailing list? http://www.blacet.com/mailform2.html
2000-12-07 by Tkacs, Ken
Transistors. What do I win?
-----Original Message----- From: perpetual@... [mailto:perpetual@...] Sent: Thursday, 07 December, 2000 3:25 PM To: motm@egroups.com Subject: [motm] NPN/PNP? sorry, i know this has probably been covered but an archives search didn't turn up any messages. what is referred to by NPN/PNP? thanks, alex
2000-12-07 by perpetual@uswest.net
sorry, i know this has probably been covered but an archives search didn't turn up any messages. what is referred to by NPN/PNP? thanks, alex
2000-12-07 by Brousseau, Paul E (Paul)
You win... a drink from the fire hose! <grin> I believe the difference between NPN and PNP is the current flow direction between the collector and emitter. Unfortrunately, I can't find or recall what the "N" and "P" stand for. (It's not something as simple as positive and negative, is it?) --PBr
> -----Original Message----- > From: Tkacs, Ken [SMTP:ken.tkacs@...] > Sent: Thursday, December 07, 2000 12:23 PM > To: 'motm@egroups.com' > Subject: RE: [motm] NPN/PNP? > > > Transistors. > > What do I win? > > -----Original Message----- > From: perpetual@... [mailto:perpetual@...] > Sent: Thursday, 07 December, 2000 3:25 PM > To: motm@egroups.com > Subject: [motm] NPN/PNP? > > sorry, i know this has probably been covered but an archives search > didn't turn up any messages. > > what is referred to by NPN/PNP? >
2000-12-07 by Paul Schreiber
NPN = Negative-Positive-Negative PNP = Positive-Negative-Positive Transistors are 3 layers of silicon with added ions (called 'doping impurities'). Paul S. ----- Original Message -----
From: <perpetual@...> To: <motm@egroups.com> Sent: Thursday, December 07, 2000 2:24 PM Subject: [motm] NPN/PNP? > sorry, i know this has probably been covered but an archives search > didn't turn up any messages. > > what is referred to by NPN/PNP? > > thanks, > alex > > > > >
2000-12-07 by Dave Bradley
As a practical matter, the electrical symbol for the NPN transistor will show the emitter arrow pointing AWAY from the junction, while the PNP will show the arrow pointing TO the junction. This coincides with the direction of conventional (NOT electron) current flow. Moe --- In motm@egroups.com, "Paul Schreiber" <synth1@a...> wrote: > NPN = Negative-Positive-Negative > PNP = Positive-Negative-Positive > > Transistors are 3 layers of silicon with added ions (called 'doping > impurities'). > > Paul S. > > ----- Original Message ----- > From: <perpetual@u...> > To: <motm@egroups.com> > Sent: Thursday, December 07, 2000 2:24 PM > Subject: [motm] NPN/PNP? > > > > sorry, i know this has probably been covered but an archives search
> > didn't turn up any messages. > > > > what is referred to by NPN/PNP? > > > > thanks, > > alex > > > > > > > > > >
2000-12-07 by J. Larry Hendry
And, to help you recognize them on schematics, the arrow points away from the base on NPN (I remember it as Not-Pointed-iN) Current flow is opposite the arrow direction. Stooge Larry ----- Original Message ----- From: Paul Schreiber <synth1@...> To: <motm@egroups.com> Sent: Thursday, December 07, 2000 2:42 PM Subject: Re: [motm] NPN/PNP? NPN = Negative-Positive-Negative PNP = Positive-Negative-Positive Transistors are 3 layers of silicon with added ions (called 'doping impurities'). Paul S. ----- Original Message -----
From: <perpetual@...> To: <motm@egroups.com> Sent: Thursday, December 07, 2000 2:24 PM Subject: [motm] NPN/PNP? > sorry, i know this has probably been covered but an archives search > didn't turn up any messages. > > what is referred to by NPN/PNP? > > thanks, > alex > > > > >