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Marks256 · 11th August 2006, 10:02 PM

What is the difference between PNP and NPN? I know that they have different amounts of P and N in them, but i mean electronics wise? Does one activate on negative voltage, and positive on the other? Or what?

_nox_ · 11th August 2006, 10:08 PM

Do you know what P and N mean ?

http://en.wikipedia.org/wiki/Semiconductor
http://en.wikipedia.org/wiki/NPN
http://en.wikipedia.org/wiki/Transistor

By the way - try google and wikipedia first!

Marks256 · 11th August 2006, 11:06 PM

Quote:

Do you know what P and N mean ?

Do i need to? Oh, and i have searched Google, but i couldn't find anything that explained it farther than; "The main difference between NPN and PNP are the materials that they are made up of...". So, i figured i would ask here. :cool:

_nox_ · 11th August 2006, 11:46 PM

Quote:

Do i need to?

yea you do

Quote:

Originally Posted by Marks256

I have searched Google, but i couldn't find anything that explained it farther than; "The main difference between NPN and PNP are the materials that they are made up of...". So, i figured i would ask here. :cool:

RODALCO · 11th August 2006, 11:57 PM

In plain English,

A NPN transistor needs a positive bias on the base to turn it on.
A PNP transistor needs a negative bias on the base to turn it on.

Check data sheets for the hfe for the transistor which is the amplification gain.

Most standard TUN or TUP's as they are called too are BC 547 NPN, BC 557 PNP and equivalents like 337,327, 107,177 etc.
max working voltage 40 to 45 volts, max current 100 mA,

Marks256 · 12th August 2006, 12:59 AM

Quote:

Impossible! Don't lie to me boy!

Lol. You need help. also you spelt "yea" wrong, it is spelt "yeah". :cool:
Also, do you have a thing for britney spears? Just joking.

Quote:

In plain English,

A NPN transistor needs a positive bias on the base to turn it on.
A PNP transistor needs a negative bias on the base to turn it on.

Check data sheets for the hfe for the transistor which is the amplification gain.

Most standard TUN or TUP's as they are called too are BC 547 NPN, BC 557 PNP and equivalents like 337,327, 107,177 etc.
max working voltage 40 to 45 volts, max current 100 mA,

Thanks for the straight forward answer! Ok, i get it now. I have an idea for a circuit. I will try it, then let you know if i was able to get it to work. Thanks a million!

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11th August 2006, 10:02 PM	(permalink)
Marks256	Transistors. What is the difference between PNP and NPN? I know that they have different amounts of P and N in them, but i mean electronics wise? Does one activate on negative voltage, and positive on the other? Or what?

11th August 2006, 10:08 PM	(permalink)
_nox_	Do you know what P and N mean ? http://en.wikipedia.org/wiki/Semiconductor http://en.wikipedia.org/wiki/NPN http://en.wikipedia.org/wiki/Transistor By the way - try google and wikipedia first! __________________ i² = j² = k² = ijk = -1

11th August 2006, 11:57 PM	(permalink)
RODALCO	In plain English, A NPN transistor needs a positive bias on the base to turn it on. A PNP transistor needs a negative bias on the base to turn it on. Check data sheets for the hfe for the transistor which is the amplification gain. Most standard TUN or TUP's as they are called too are BC 547 NPN, BC 557 PNP and equivalents like 337,327, 107,177 etc. max working voltage 40 to 45 volts, max current 100 mA, __________________ There are more ways to get to Rome. Electricity, Electric clocks, Meters and Trains are great. Last edited by RODALCO; 12th August 2006 at 12:02 AM.