Dual ESC and BEC... sanity check

[Sam Hough]

Hello,

My Dad has gone down the two motor route with his UC (I really wanted to play with the original setup but it is his project...).

Anyway, am I being out of date thinking it would be really bad to connect the output of the two BECs in the two ESCs together? Two voltage regulators are just going to fight trying to get to two slightly different voltages?

I was thinking of just pulling the red wire out of one of the rx plugs and covering it in heat shrink.

Thanks

Sam

[Adrian Harris]

It's certainly caused issues with certain modules.

You could join them with diodes, but then you'd lose the diode drop.

Adrian.

[Sam Hough]

Thanks Adrian,

If a single one could power three (quite fancy by my standards) servos then should be able to manage one and some extra LEDs.

My Dad seems to have managed to kill about five very nice servos. He said one smoked but three just stopped. I have hopes to repair them although they don't really go in anything I do these days.

Cheers

Sam

[John Clarke]

Hi Sam
More than one BEC (battery elimination circuit) supply can cause quite a few problems, as we have seen on the red boxes on certain equipment.
My advice would be seperate control supply circuits.
The Armortek UC supplied ESC (electronic speed controller) BEC is rated at around 3 amps I think, This will have to supply the receiver, 3 servos and the sound module if purchased, if I remember rightly.
One standard servo at rest will draw around 100ma and up to 2amps under load (or more if stalled) so the BEC has it's work cut out on the UC.

If your not using the brake servos with a twin motor system less load will be on the one ESC BEC. 3 amps should be ample

My personel choice would be to disconnect the ESC BEC red wire and insulate, then supply the control gear with a beefier seperate 5+ amp BEC. but that's just me.