building transistor as a switch

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uvaraj6

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hi friends i want to design a switch using transistor...

can any body help by providing some circuit.. and help me...
 

use a MOSFET (give your control input gate that will allow signal to flow from drain to source(nmos))and be carefull if you are going to drive a relay you will have to put a free wheeling diode....You can refer to any website or books on electronic devices boyelstead or sedhra & smith
 
where exactly do you want to put in your switch? is it a critical component in your circuit?
 
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