Power expander battery connectors

Power expander battery connectors
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Power expander battery connectors - 4/3/2005 4:49:24 AM

Smokey

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From: Bronxville, NY, USA
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I was wondering if you have some sort of adaptor plug to mate up a standard plug to a deans connector. I would like this option if i had to change batteries in the field which are not set up with deans plugs.

Thanks
Froy

Post #: 1

RE: Power expander battery connectors - 4/4/2005 3:26:09 PM

rrritchey

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From: Phoenix, AZ, USA
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Hi Froy,
Sorry for the late reply, we were off at an IMAC in LV. Currently we do not offere something like this. It kind of defeats the purpose of using the Deans plugs and 18ga wire but I understand why it might be needed some times. We will take this into consideration as a future accessory. Thanky you,

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RE: Power expander battery connectors - 4/5/2005 1:44:29 AM

Smokey

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From: Bronxville, NY, USA
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Thank you for the replay.

Smokey

(in reply to rrritchey)

Post #: 3

RE: Power expander battery connectors - 4/5/2005 2:03:08 PM

Geistware

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From: Locust Grove, GA, USA
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MPI makes them as well as Radical RC.
I Purchased two MPI charge leads for Dean plugs at Hodges Hobbies.
I had radical RC make up a couple of packs with heavy gage wire (12 awg).
I then modified two MPI switches using DVM leads (?awg)
The system works great. Wires are a little difficult to route because of there size but I can deliver a lot of current to the power expander without voltage loss. Wires and switch tested to 0.1 volt at 10 amps!

Robert, I do have one question.I am using a bench power supply that is capable of 30 volts at 30 amps.
I set it for 6 volts to my power expander and when I put spiked loads on my servos, I see power at the male connector of the power expander as constant, but the power at the DSC plug on my receiver is carrying a few millivolts. (don't know how much)

I was under the impression that the receiver power was regulated. And if so, how is it that servo load is effecting receiver voltage.

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RE: Power expander battery connectors - 4/5/2005 2:47:53 PM

rrritchey

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Hi,
The power to the receiver is regulated but any regulator has a recovery time. I have a 10uF ceramic cap at the input to the regulator and a 33uF tantalum cap on the output. A regulator will create a small output bump if the input voltage changes. If there were no regulator there you would see a much larger amount of noise when you pulsed the servos. While regulators reduce the amount of feedthrough from an input voltage change they do not completely eliminate it. I could put an even larger output cap on the regulator but for the 50mA or so the receiver draws the 33uF was a good trade off between filtering and cost. I hope this answers your question, if not let me know. Thanks,

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RE: Power expander battery connectors - 4/5/2005 4:20:31 PM

Geistware

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From: Locust Grove, GA, USA
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Nope. it answers it.
The Power Expander unit looks good on the bench.
I am still deciding on an engine but I have everything else connected and working and I am very pleased.
About the only other thing that would be nice is if you had a matchbox feature on channels 1, 6, and 7 for the futaba.
This would allow for multiple servos on ailerons for the flaperon (1&6) or Aileron Dif (1&7) when using futaba radios.

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Post #: 6

RE: Power expander battery connectors - 4/5/2005 4:37:09 PM

rrritchey

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Hi again,
We do have a version with Equalizer functions prototyped. It needs some
more code written and then flight time. It has 6 channels Equalized, the
ones on your PowerExpander with 4 outputs. We are working towards a
late summer release on this.

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Robert Ritchey
Owner, Smart-Fly

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Post #: 7

RE: Power expander battery connectors - 4/5/2005 6:10:11 PM

Geistware

Posts: 12946
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From: Locust Grove, GA, USA
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WOW, wish I had known, I would have waited!
Wouldn't you use the same code that is in the equalizer?
Seams to me that once you have incorporated the hardware, the rest would be down hill

quote:

ORIGINAL: rrritchey

Hi again,
We do have a version with Equalizer functions prototyped. It needs some
more code written and then flight time. It has 6 channels Equalized, the
ones on your PowerExpander with 4 outputs. We are working towards a
late summer release on this.

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Information on the building and flying of Radio Control Aircraft.
Site for hobbyist in the R.C. Aircraft modeling world.

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Post #: 8

RE: Power expander battery connectors - 4/5/2005 6:48:51 PM

rrritchey

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From: Phoenix, AZ, USA
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Hi,
The code is similar but when you have to handle 6 input channels and 24 output channels it has to change vs a single input channel and 3 output channels. Using 3 or 6 separate micros would make the unit cost very high. I am still not sure what the cost will be but it wil probably be between $175 and $200. Keep in touch and I will let you know how it progresses along.

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Robert Ritchey
Owner, Smart-Fly

(in reply to Geistware)

Post #: 9

RE: Power expander battery connectors - 4/5/2005 9:11:11 PM

Geistware

Posts: 12946
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I will do just that, thanks

quote:

ORIGINAL: rrritchey

Hi,
The code is similar but when you have to handle 6 input channels and 24 output channels it has to change vs a single input channel and 3 output channels. Using 3 or 6 separate micros would make the unit cost very high. I am still not sure what the cost will be but it wil probably be between $175 and $200. Keep in touch and I will let you know how it progresses along.

_____________________________

Aircraft Proving Grounds
http://www.rcaircraft.net/
Information on the building and flying of Radio Control Aircraft.
Site for hobbyist in the R.C. Aircraft modeling world.

(in reply to rrritchey)

Post #: 10

RE: Power expander battery connectors - 4/5/2005 11:10:35 PM

Smokey

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From: Bronxville, NY, USA
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Im staying tuned for this one.

Smokey

(in reply to Geistware)

Post #: 11

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