How can I upgrade/develop this circuit to become more effective, efficient and complex.

Discussion in 'The Projects Forum' started by E/E Engineering, Apr 15, 2016.

  1. E/E Engineering

    Thread Starter New Member

    Apr 15, 2016
    2
    0
    FINAL CIRCUIT FOR LAPTOP COOLER (photo).png

    My circuit is a automatic laptop cooler. I have try to add two more comparators in to the current circuit where each comparator lights a colored LED when a certain temperature is sensed, however i tried, but did not work for the reason i do not know how to combine them together. another idea was when a certain temperature is senered they will be a fixed voltage and they will be three LED with 3 fixed voltage, that come on when that certain temperature hits. e.g. 25ºC will be 5v which will light up LED 1 and 35ºC will be 8v which will light up LED 2, however this was too complex and did not work.

    I will appreciate any help or advice and thank you for reading this.
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,120
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    LM3914
     
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  3. E/E Engineering

    Thread Starter New Member

    Apr 15, 2016
    2
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    senses analog voltage levels and drives LEDs
     
  4. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
    1,438
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    Add some hysteresis to the comparator.
    The relay is not required; use a suitably rated transistor to drive the motor directly.
     
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  5. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,986
    745
    Use a Lm35 temperature sensor and lm3914 bargraph chip, more linear response better than a thermistor.
     
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  6. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,040
    287
    Might I encourage you to challenge the assumption that "upgrade" and "complex" ever belong in the same sentence.
     
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  7. SLK001

    Well-Known Member

    Nov 29, 2011
    817
    227
    Add hysteresis and a high side P-channel MOSFET to replace the relay.
     
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