You can use one of the 12V regulators but they will get hot and also remember that they will not warn you if your LiPo gets too low (remember not to rely on the TX battery meter either!). It is recommended that you use some smoothing capacitors as per the reference circuit for these components. I once did something like this for my Butterfly plane and it worked well as I did not have a proper switch mode regulator at the time.
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