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Permalink Reply by Colin Bouriquet on January 8, 2012 at 1:20pm

I would be interested by an answer to this question too... The ESC used in the Easystar II RR ( MULTIcont BL-20 SD ) has a BEC that delivers 5.5V is it OK to plug it into the APM2 output rail ? Thanks.

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Permalink Reply by tuckerobie on January 8, 2012 at 9:20pm

I was told 5v

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Permalink Reply by James masterman on January 8, 2012 at 10:16pm

I'm surprised it is not more clearly spelled out in the manual, but it seems that 5v +/- a small amount (like 0.2v) is what is required for APM 1. I assume APM 2 is similar. This is based on searching through old posts.

I am using a separate UBEC that outputs 5v,which has never cause a problem. It is just a shame that a lot of ESC's output 5.5v, which causes APM to do strange things.Otherwise I could have a neater setup inside my plane.

I would avoid plugging your 5.5v BEC into the APM 2 rail. You can buy a UBEC for <$15 that will output the correct voltage and be safer.

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Permalink Reply by Colin Bouriquet on January 9, 2012 at 1:41pm

Thanks for the answers guys!

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Permalink Reply by Ahmed Rehan on January 9, 2012 at 11:48pm

I made a switchng regulator using LM2576-5 it gives perfect 5v output now APM is working ok you can find data sheet at;

http://www.ti.com/lit/ds/symlink/lm2576.pdf

it is 3A 5volt switching regulator with wide input range. i have isolated APM and servo voltages also.

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Permalink Reply by Steve on February 10, 2012 at 3:49pm

There is a LM317 voltage regulator on the APM 1.0 for external power source. Does the APM 2.0 have something similar?

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