circuit design. control hot or not?

Discussion in 'General Electronics Chat' started by andrewspencer, Dec 7, 2014.

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  1. andrewspencer

    Thread Starter New Member

    Dec 7, 2014
    I am working on a moderately silly project to control the heater fan speed on my Volvo with an arduino.

    I have the arduino sending a PW to a MOSFET that then (and this is where I get stuck)
    1. control the hot side of the circuit. It seems like the safest to me. *or*
    2. control the ground side of the circuit. but then the wire is "always" energized. Seems slightly less safe. But I could also do something or another with the ground to make sure that the fan is actually drawing current...

    Thoughts? Suggestions? Is that as clear as mud?


  2. #12


    Nov 30, 2010
    Try electrotech-online. This site is off limits to automotive designs.
  3. MrChips


    Oct 2, 2009
    The owners of All About Circuits have elected not to allow discussions of automotive electrical system modifications/enhancements due to safety concerns, the potential of legal ramifications and the possible circumvention of vehicle regulations at the state and federal level.

    This thread is against the AAC forum rules, Chapter 6, as seen here:

    This can be found in our Terms of Service (ToS)

    Here is a site that may provide you with some assistance: Electro Tech Online

    Good luck
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