Guest abukharmeh Posted July 15, 2013 Report Share Posted July 15, 2013 hello am new herei need some helpa have 4 type of transistors9012s9013s9014c1815which one is suitable to use as (transistor as switch)to turn on motor from dc source (6volt 500ma) or 9 voltand what is the value of resistor i have to connect to transistor base !!!!sorry for my weak englishthanks for your help Quote Link to comment Share on other sites More sharing options...
Hero999 Posted July 15, 2013 Report Share Posted July 15, 2013 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. Quote Link to comment Share on other sites More sharing options...
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