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fan speed control with temperature

Discussion in 'General Electronics Discussion' started by pankajwillkillu, Mar 21, 2014.

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  1. pankajwillkillu

    pankajwillkillu

    2
    0
    Mar 21, 2014
    OK , directly expressing the problem scenario .
    I have a temperature sensor [IC LM 35], comparator [IV 741 opamp] , a fan [18V D.C fan], thyristor [SCR TYN612M].

    Now, i want to use them over to form a circuit capable of controlling my fan speed in proportional to temperature.
    Is there a way out to form a simple but effective circuit out of this?
    HELP !
    :confused:


    i know what to do but don't know how to do (eg, i don't know what values of L-C pair should i employ for simple commutation of SCR)
     
  2. pankajwillkillu

    pankajwillkillu

    2
    0
    Mar 21, 2014
    transistor

    SCR needs to be ruled out of scene i am thinking of using BJT transistor with enough rating to start working with LM35 output being fed to its base.
    Will it work?

    [​IMG]

    If yes, then what rating of transistor should i choose and are there any other pheriferals(resistors,capacitors etc) required
     
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