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transistor help !!


Guest abukharmeh

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Guest 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

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Some of those transistors are NPN and the others PNP so are not interchangeable.

You need to makse sure the transistor can handle the current surge when the motor starts.

The base resistor depends on the control voltage i.e. what's connected to the base. To ensure good saturation, the base current should be 1/10 the collector current but you'll probably be fine with 1/20.

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