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Re: [Paparazzi-devel] Re: Futaba T6EXAP 3 Position Switch Hacking

From: cory barton
Subject: Re: [Paparazzi-devel] Re: Futaba T6EXAP 3 Position Switch Hacking
Date: Wed, 6 Aug 2008 21:49:14 -0400

Thank you for the feedback Bernard. It really makes my day when I know I have helped someone.

I did forget to add in my first post, that the job of the 4051 seems to be to create something analogous to the PPM signal that the transmitter then processes into the RF signal. That's how I understood it anyhow.

On Wed, Aug 6, 2008 at 9:18 PM, Bernard Davison <address@hidden> wrote:
Hi Cory,

Thanks for posting this. :-)
I've been wondering how exactly this radio mod should be done and purchased the T6EXAP radio recently because it is already being used by others.

I'll be making the mod to my radio in the not too distant future and will give you a full review of the instructions at that time. :-)


On 07/08/2008, at 10:23 AM, cory barton wrote:

I added a 3 position switch to my Futaba transmitter. I have added the instructions to the wiki here:

I wanted to add the switch to channel 5, but channel 5 does not appear to have an ADC attached to it. Each channel, and the Dual Rate and Trainer switch is connected to a BU4051BCF IC.

From the datasheet: "The BU4051BC, BU4051BCF and BU4051BCFV are analog multiplexers / demultiplexers which use three-input digi-tal signals for control via an 8-channel analog switch. These products feature high on / off output voltage ratio and low crosstalk between analog switches."

As part of the process of determining if it is possible to connect the 3 position switch to channel 5, I documented the connections to the 4051 IC. I have uploaded that diagram to the wiki in the hope that it may prove useful to someone else.


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