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  1. #1
    RC Racer
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    Externel BEC with EVX2? Is internal BEC switching?

    Hi,

    I'm looking into the idea of using two parallel 5s lipo packs to power a 14,4V Dewalt motor. This all on a stock EVX2.
    We are discussing it here:
    http://monster.traxxas.com/showthrea...=1#post3933441

    A couple of questions arised in this dicussion which deserve a new thread I believe.
    - Would be possible to use an external BEC with the EVX2. Can anyone answer this?
    - Also, would this take the load off of the internal BEC in the EVX2?
    - And If the internal BEC were to be destroyed, would the EVX2 still work with an external BEC?
    - Does anyone know if the internal BEC is a switching or a liniar regulator?

    Thanks

  2. #2
    RC Qualifier
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    Sep 2008
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    Quote Originally Posted by Rebelgium
    - Would be possible to use an external BEC with the EVX2. Can anyone answer this?
    Yes, I have done this (for a different reason). You just disconnect the middle wire (best to do this on an extension cable so that you don't damage the EVX's cable) and use the U-BEC to generate power directly from the battery leads.
    Time is an illusion, "9am sharp" doubly so.

  3. #3
    RC Racer
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    Apr 2009
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    Here's a little update on some answers I managed to get:
    - Yes
    - Yes
    -Probably not, because the internal BEC will always be needed to power the logics of the EVX2, without the internal BEC I suspect the EVX2 won't work.
    - Still don't know


    But I have decided to get an external BEC. The main question I have now is:
    Howmuch current should an external BEC be able to provide continuously?
    The External BEC will only need to power the two servo's and the receiver.
    So does anyone know the stall current of one of the stock steering servo's?

  4. #4
    RC Qualifier
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    Quote Originally Posted by Rebelgium
    Howmuch current should an external BEC be able to provide continuously?
    The External BEC will only need to power the two servo's and the receiver.
    So does anyone know the stall current of one of the stock steering servo's?
    I don't know exactly how much current they take, but I have used this 3A UBEC costing $7 on the E-Revo with stock servos and had no problems.
    Time is an illusion, "9am sharp" doubly so.

  5. #5
    RC Racer
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    Apr 2009
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    Update,
    I found the EVX2 internal BEC is rated at 2,5A and is probably linear.
    So if anyone wants an external BEC, the best choice would be the 3A BEC from ********* (see link above).

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