PNP or NPN transistor what difference does it make??? and why do we amplify the current?

Question

PNP or NPN transistor what difference does it make??? and why do we amplify the current?

Answer 1

The difference between them is simply which direction the current flows. Generally, it doesn't matter which one you use, NPN or PNP, as long as you connect the + and - properly.



Check out the NPN and PNP sections here: http://en.wikipedia.org/wiki/PNP_transistor#NPN



For a good explanation of transistor amplification see: http://www.allaboutcircuits.com/vol_3/chpt_4/5.html

Answer 2

Pnp Transistor Wikipedia

Answer 3

NPN and PNP are almost exactly the same, except the polarities of the bias voltages/currents are reversed. collector bias is + for NPN, – for PNP, etc. NPN are much more common than PNP transistors. transistors amplify current or voltage depending on the circuit. Given that they amplify voltage, if you overdrive them, they move between two fixed states, saturation and cuttoff, and thus act as a digital switch. Additional inputs allow them to operate as digital gates. .

Answer 4

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PNP or NPN transistor what difference does it make??? and why do we amplify the current?

Answer 5

NPN

The symbol of an NPN Bipolar Junction Transistor.

The symbol of an NPN Bipolar Junction Transistor.



NPN is one of the two types of bipolar transistors, in which the letters "N" and "P" refer to the majority charge carriers inside the different regions of the transistor. Most bipolar transistors used today are NPN, because electron mobility is higher than hole mobility in semiconductors, allowing greater currents and faster operation.



NPN transistors consist of a layer of P-doped semiconductor (the "base") between two N-doped layers. A small current entering the base in common-emitter mode is amplified in the collector output.



The arrow in the NPN transistor symbol is on the emitter leg and points in the direction of the conventional current flow when the device is in forward active mode.



A convenient mnemonic device for identifying the symbol for the NPN transistor is "not pointing in".[2]



[edit] PNP



The other type of BJT is the PNP with the letters "P" and "N" referring to the majority charge carriers inside the different regions of the transistor. Few transistors used today are PNP, since the NPN type gives better performance in most circumstances.

The symbol of a PNP BJT.

The symbol of a PNP BJT.



PNP transistors consist of a layer of N-doped semiconductor between two layers of P-doped material. PNP transistors are commonly operated with the collector at ground and the emitter connected to a positive voltage through an electric load. A small current flowing from the base allows a much greater current to flow from the emitter to the collector.



The arrow in the PNP transistor symbol is on the emitter leg and points in the direction of the conventional current flow when the device is in forward active mode.



A mnemonic for identifying the symbol for the PNP transistor is "points in proudly





we amplify weak signals.

our normal desktop speakers has an amplifier also.

Answer 6

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you can go to WWW.WIKIPEDIA.COM. but basically a transistor is two diodes back-to-back. in a NPN your junction is negative-positive-negative, as if you connect two diodes by the positive leads. the pnp transistor is two diodes joined by the negative leads. and remember, in a diode you can only pass current after the barrrier potential (0.7 Volts).