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What is a relay and which one should i use ??

Discussion in 'General Electronics Discussion' started by hrshi, Apr 2, 2013.

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  1. hrshi

    hrshi

    1
    0
    Apr 2, 2013
    http://www.edaboard.com/thread53996.html this thread doesnt serves my purpose.

    i need to make a motor rotate with an external battery of 9 v caonnected in series with the motor and the relay.. and also want the other circuit to be connected to the serial post of the computer.

    the pc supplies 5v and the external battery that i have attached is of 9v(to drive the motor.)_

    what actually i want to do. ???
    i have a programe in C language which allows me to send dc 5v signal to data pins of the serial port ! so i want that when i send the 5v signal then the relay completes the external circuit and the mortor starts running !

    so which relay will solve my purpose.?? really confused being a computer science engineering student.
    seeking help !!

    and moreover i need not convert 5v to 9v ! so dun get confused by that . 9v is in the external circuit and has no connection with the serial post !
     
    Last edited by a moderator: Apr 2, 2013
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    10,333
    2,244
    Nov 17, 2011
    Please don't post the same issue twice. I deleted the other post.
    Harald
     
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