DC motor speed controlled by temperature

Discussion in 'General Electronics Chat' started by rahulrox1991, Mar 17, 2012.

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  1. rahulrox1991

    Thread Starter New Member

    Oct 31, 2011
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    I am required to make a circuit that controls the speed of a 12v DC motor with change in temperature. I'd be really grateful if anyone could help me with a simple circuit to achieve this objective.

    The other day I came across this circuit on the net. If some one could also explain the working of this one. (Check the link that follows)
    http://www.circuitstoday.com/temperature-controlled-dc-fan

    Also, I found this which implements the design for an AC motor. Could I modify this and use it for a DC supply. I can only use a 12V motor though. Also could anyone please guide me as to why the optocoupler and triac is ised here. If a triac is required for a 12v DC motor as well, what should be the rating? I mean which model number? (Check the link that follows)
    http://pecworld.zxq.net/Assets/SOUR.../166_AUTOMATIC TEMPERATURE CONTROLLED FAN.pdf

    Any new design ideas would also be really appreciable. Thanks in advance :)
    (Please explain the working of the circuit whatever you suggest since I'll be required to answer all sorts of cross questions in the viva as well :( :p)
     
  2. Wendy

    Moderator

    Mar 24, 2008
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