transistor help !!

abukharmeh

hello am new here
i need some help
a have 4 type of transistor
s9012
s9013
s9014
c1815
which one is suitable to use as (transistor as switch)
to turn on motor from dc source (6volt 500ma) or 9 volt
and what is the value of resistor i have to connect to transistor base !!!!

sorry for my weak english
thanks for your help

LoopyByteloose

Well nearly all transistors will handle anything under 35 volts.. many handle anything under 60 volts.
So I suspect that all will do nicely at 9 volts.

500ma can be done with a 2N2222, so I rarely bother with looking at individual data sheets for other items.

Futurelec.com has data sheets for all it sells and that makes research easy. The s9014 is only 100 ma -- no good. It is an audio pre-amp transistor.

Look up each and every PDF or just use a 2n2222. If that is too small, a TIPxxx series NPN will handle 1 amp or more.

Connect the resistor to the base? Well to protect the Propeller or the BS2, I'd say 330 ohms is a good value. But if you want to 'engineer' the actual saturation of the transistor's on condition, you would need to choose one to calculate the right resistor value.

You know... the answer just might be "none of those you listed above".
Plastic transistors handle the least power, metal can transistors can handle more, and metal tabs are even better.

abukharmeh

if i look in the data sheet how i would know maximum value that the transistor will handle
there is many current values there !!

LoopyByteloose

I will make this simple for you. I did not mean to be unkind.

Use a 2N2222. NONE of the transistors you listed are correct. I think all the NPN transistors are at 100ma.

Read the data sheet for the 2n2222. Ic = 800ma
http://www.futurlec.com/Transistors/2N2222.shtml

You can use a 330 ohm resistor between the base and the micro-controller

abukharmeh

thanks for your help