information about BJT transistor

[javad2040]

Hi.
I want to use BJT transistor for my project. what is their features? what company makes it?
what types(PNP or NPN) is better and easy to use?

[agehall]

I'd suggest you start by reading some basic literature like The Art of Electronics.

[kalel]

I'm in no way at all affiliated, but I find this kind of interesting:
http://www.talkingelectronics.com/CctSymbols/PNP-or-NPN/PNP-or-NPN.html

I've yet to go through this myself:
http://www.talkingelectronics.com/projects/BasicElectronics-1A/BasicElectronics-1A_Page2.html

Seems useful. Especially appreciated are some simple circuit examples.
It's always an inspiration to learn if you can actually start by easily making something small/simple that works, just to spark further interest.

A simple simulator also helps to visualize things such as "what happens when I change the resistance".
I would suggest this one: http://www.falstad.com/circuit/circuitjs.html - on the basis that it is simple to use and visualize things.