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solar tracker without relay?

Discussion in 'General Electronics Discussion' started by mhastie1234, Feb 10, 2012.

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  1. mhastie1234


    Feb 10, 2012
    Can someone point me in the right direction? I would like to use this circuit with out relay's.
    Q1 is high during the day. When it is dusk Q2 will go high to return the panel to the east for the next morning. I am not sure how to design it so i can have the motor hook up both ways. I was thinking of using a logic gate or something along those lines.
    Any suggestions would be greatly appreciated.

    Here is the circuit
    Last edited: Feb 10, 2012
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    You could replace the relays by an H-bridge (Google).
    However, this will require considerably more electronics than just replacing the relays.
    You will need:
    - 4 power transistors, most probably with a heatsink for each
    - additional logic to generate the control signals (4) for the transistors.
    - additional current limiting (not mandatory, but I'd recommend that)

    In this case two relays as shown really are a very economic solution.

  3. jackorocko


    Apr 4, 2010
    My first assumption was the exact same as haralds, why would you not want to use the relays?
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Depending on a number of factors, the mosfet solution may be smaller, reduce power, or switch faster.

    The last point is especially useful if he has a very fast moving sun.
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