Splitting Servo Load in an Rx????

[G.P.]

Hello,

I asked this in the Castle forum, but was just told that I should buy a CCBEC. I thought I would ask it here since you guys are smart!

I am setting up a twin otter at the moment that is going to have at least 7 HS65 servos and will be running on 4 cells. I know that I could just run an external BEC, but that seems like a waste (and extra weight/wiring) since the two esc's that I'm running have built in switching BEC's. Unfortunately 7 servos is too much of a load for one of these built BEC's, but will work fine if I could some how split the servo load between the two BEC's.

I'm wondering if there is a spot on an Rx circiut board where I could cut a copper trace and split the positive servo bus into two? In my mind this would allow me to plug one esc into channel 3 (like normal) to power half of the servos and plug the other esc into channel 7 to power the other half of the servos.

Am I out to lunch on this theory?
Greg

[Cirip]

Your idea is valid.
The (+) pins on the receiver connector are usually connected together. Split the (+) track midway and you'll have two groups than can be powered from 2 separate BECs. A good quality picture of your actual receiver, where the servo connector is soldered to the board, would allow me to be more specific.

Cirip

[vintage1]

Your idea is valid.
The (+) pins on the receiver connector are usually connected together. Split the (+) track midway and you'll have two groups than can be powered from 2 separate BECs. A good quality picture of your actual receiver, where the servo connector is soldered to the board, would allow me to be more specific.

Cirip

There is a way that doesn't involve messing up your receiver.

You can make up a board out of verobaord with otr without servo pins on it, with a split positive, solder (or plug) the servos into that, and carry just ONE positive from ONE rail and ONE negative back to the receiver.

Carry all the signal wires of course...
connect the ESC signals together, but take the positives to different rails.

Voila! a split load distribution board..built into the aircraft..

[Acetronics]

Hi, GP

Would this Help ...??? ;)

V+ is + voltage "through" the receiver
V++ is + voltage direct from the batt ...

"fil de forte section " means heavy gauge wire ...

you can simply connect the first ESC "classically" to , say 3 or 4 servos ... :)

and connect the " + wire " from the second esc BEC straight to the + wire of the others servos ( with no connection to + of the Receiver ).

that means you take the "+ wire" OFF the second BEC plug , the "+ wireS" of your second group servos OFF their plugs and connect all those "+ Wires" together. :)



Alain

[Ricardo RW]

Hi, GP

Would this Help ...??? ;)

V+ is + voltage "through" the receiver
V++ is + voltage direct from the batt ...

"fil de forte section " means heavy gauge wire ...

you can simply connect the first ESC "classically" to , say 3 or 4 servos ... :)

and connect the " + wire " from the second esc BEC straight to the + wire of the others servos ( with no connection to + of the Receiver ).

that means you take the "+ wire" OFF the second BEC plug , the "+ wireS" of your second group servos OFF their plugs and connect all those "+ Wires" together. :)



Alain

What are those boxes between the receiver and the servos?

It could help if you crop the picture only to the electronic parts and get rid of the frame, I can't see much detail, sorry.

[Acetronics]

Hi, Ricardo

1) clicking on the picture helps ...

Those "boxes" only represent connectors, PCB pieces, or whatever you use to connect the left side inputs to the right side outputs ...


what is intersesting is not the boxes ... but the wiring !


Alain

[G.P.]

Thank you for all of the help guys!

Vintage, AndyW gave me this link (http://www.servocity.com/html/servo_power_boards.html) and I think this would work great with what you were saying. I think I'm going to go that route since I'll nee some extensions anyways, so the weight gain will be minimal, and I won't have to mess with my Rx at all. After opening up an Electron6 and a Berg7 I'm a little hesitant to cut anything.

Thanks again!
Greg

[Ricardo RW]

Hi, Ricardo

1) clicking on the picture helps ...


Yeah... I know. I have the face but (I think) I'm not that *****


what is intersesting is not the boxes ... but the wiring !
And that's exactly what I like to see...

[vintage1]

Vintage, AndyW gave me this link (http://www.servocity.com/html/servo_power_boards.html) and I think this would work great with what you were saying. I think I'm going to go that route since I'll nee some extensions anyways, so the weight gain will be minimal, and I won't have to mess with my Rx at all. After opening up an Electron6 and a Berg7 I'm a little hesitant to cut anything.

Thanks again!
Greg


yep. If you don't want to solder too much those dis boards look the business.

Should be relatively easy to split loads and link the rx into one or another positive.