Re: [Paparazzi-devel] reply to "Blown power supply - again"

[Jesper Kempe]

Thanks for the answers

But it confuses me. The last time the module burned I had nothing connected to the Tiny. No servos, no modem - just the Tiny powered from a 3 cell LiPo.
So it must be something else that causes my problems.

But I will try the suggested setup. 

Regards
Jesper

2009/7/22 David Conger <address@hidden>

I agree,

The specs may look promising when designing the Tiny2.11/TWOG but reality is when people select any servo and any airframe they often do not do the calculations and compare with that the Tiny2.11/TWOG (or even Tiny1.3 for that matter) can provide.

The general feeling out there is that you can plug up to 8 servos into a Tiny/TWOG and go fly regardless of the size or power requirements. Maybe the Wiki should reflect what we see and provide more details about how to power things? I'm not an EE so I would be a poor contributor from a technical standpoint. If someone gave me the details I'd gladly do the edits to the Wiki.

I'm thinking a new page as a link under one of the main pages that gives example configurations. If not photos diagrams showing some details of the connections for the most common setups.

Like Chris I now recommend to anyone buying a Tiny/TWOG to power from the ESC and those that have followed this advice have had no power issues at all. It seems modern ESC with BEC are very reliable and capable.

@Gautier: That was excellent information about the control loops. THANK YOU. I will study it and am confident it will help my situation and at least one other person flying paparazzi I am helping.

-David Conger

On Jul 22, 2009, at 8:47 AM, chris wrote:

Hi.
Try not to use the internal 5v power for anything else than the paparazzi board.
I also did had problems coming from the servos.
If one or more servo stalls it can easily burn the 5v regulator.
Power the servos and/or the receiver from a separate bec or battery.
Simply connect only the signal and ground wires from the autopilot to the servos
and use a strong (10A or more) bec or a 4-5 cell battery  for  powering them
by connecting the bec/battery +5v to the servo +5v input and the bec/battery - 5v
to the servo -5v ground.
You can also power the receiver from the bec/battery by connecting only the ppm output wire
and the ground wire.
This is what i do as standard procedure and it works fine.
Chris




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