I was doing a 3*3*3 arduino cube project when this doubt struck me.
Some instructables I watched used 2N3904 transistor whereas a few used BC547.
I hava a 548 at hand and was thinking whether I could use it. I use a variety of leds - red,blue,green and yellow. So current may range between 15 to 25 mA I guess.
Can BC 548 switch in these ranges?
The terms hfe, beta, current gain, transconductance still confuse me. Guess I'm not so thorough with my basics. A little bit of googling has left me in utter confusion.
Can somebody please shed some light upon the matter?