9X (and possibly 9XR/PRO) Switch Board Design

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jhsa
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by jhsa » Thu May 18, 2017 1:18 pm

Ok, Here is something.. Please don't look at the values yet. It's just a sketch and will need to breadboard this.
The green square represents the radio circuitry. I think I even represented the 9xtreme power design problem, and I forgot to add a reverse polarity protection. Will do that later.
as i said this is just an idea.
The circuit inside the red rectangle represents the charging circuit, with reverse polarity protection and another Mosfet to allow to switch the positive side but controlled by the ground signal at the power switch..

The LED's represent the motherboard power and the RF module power..

Will breadboard this a bit later as my wife is getting in my nerves now.. She needs my computer.. GGGRRRRR v :twisted: :mrgreen:

João
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Safe Power switch with charge.jpg
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MaartenH
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by MaartenH » Fri May 19, 2017 6:37 am

Are the circuits in the red and green rectangles as the original circuits in the radio (exept for the green LED with resistor in the green rectangle)?
jhsa wrote:
Thu May 18, 2017 1:18 pm
Will breadboard this a bit later as my wife is getting in my nerves now.. She needs my computer.. GGGRRRRR v :twisted: :mrgreen:
You have to keep your wife happy too.... :D
Turnigy 9X - 9Xtreme board - M9 Gimbals

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jhsa
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by jhsa » Fri May 19, 2017 8:14 am

The circuit in green is the approximate 9xtreme circuit. I do not have the schematic, so that is what I think the circuit is..
Anyway, discard that picture. I will be posting another one shortly with much less components.
With this new circuit, apart from building the board (I will try to design it single sided), I would recommend replacing the original charging circuit's diode on the radio's back board with a schottky diode.

João


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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by jhsa » Fri May 19, 2017 10:27 am

Ok, here it is. This is what I have in my radios except for the Charge switching transistor and the diode.
The Ar9x board already has a well placed protection diode and it also doesn't use the charge port. It uses the charge circuitry to connect the telemetry signal between the BackBoard and the MainBoard. The 9xtreme does use the charge circuit for charging.
I still didn't test this.
I couldn't decide whether to use a single diode protecting both MB_PWR and RF_PWR, or one diode for each. I opted for just one diode to keep the part count low. The diode shown on the schematic can take a max current of 3A, which should be enough. The "SS34" can also be used..
The mosfets have a max current rating of about 4A..

Needs testing.. will try to breadboard this later.. :)
Now to design a PCB. Hopefully single sided ;)

João
Attachments
Switch Board-9Xtreme.png
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MaartenH
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by MaartenH » Fri May 19, 2017 12:23 pm

Wow João! The speed you come up with designs is amazing... :o

The number of parts is indeed kept as low possible. Nice!

You will test this on the breadboard, but do you also test circuits with a computer program?

Single sided PCB would be nice... ;)
Turnigy 9X - 9Xtreme board - M9 Gimbals


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jhsa
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by jhsa » Fri May 19, 2017 1:12 pm

I use "Yenka" to test the circuits.. it is free as long as used at home and not for work.. It only works before or after work hours and weekends..
Or you can buy a license of course :)

If someone knows another good (free) program please let me know.. The problem with these programs is that they have some flaws and can't be 100% trusted, but do give a good idea of how the circuit will work..
For example the circuit works on Yenka without R4, but it doesn't on the breadboard..

Working on a PCB at the moment.. Comments and suggestions are very welcome and appreciated.. :)

João
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by jhsa » Fri May 19, 2017 6:07 pm

This is untested, and I still didn't breadboard it :) but.....
Something like this??

I know, it is not professional at all, still learning :) ;)

João
Attachments
Switch Board-9Xtreme_PCB_Components.png
Switch Board-9Xtreme_PCB.png
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by jhsa » Fri May 19, 2017 9:33 pm

Found a mistake. R1 should connect to the Kathode to the diode, not the Anode :(

Will update the schematic and the other pics in a while..
Sorry about that..

João

EDIT: Mistake corrected and files updated..

Once all is tested I will post the eagle files
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by jhsa » Sat May 20, 2017 2:21 pm

Ok, here is a little video I did last night.

https://www.youtube.com/watch?v=sl8F55O0RMw

After I did the video, I have realized that there was some current drained from the battery (160uA) when the circuit was turned OFF. This was due to the Mosfet resistors in the charging circuit draining to ground. I increased the resistor values and could decrease that current to 25uA. This might be close to the batteries self discharge current :)
But I was still not happy with it, so I placed another schottky diode after the Mosfet that controls the charging circuit. Obviously the diode on the backboard will have to be bypassed. But that is easy to do ;) :)

I need to make a PCB now and test with a real original 9x board, to make sure there is really no magic smoke, and all works as it should.. :)
Here are a couple pics, as well as a PDF file you can use to make a PCB yourself, and the eagle files if you want to modify the layout. But this still needs testing before it goes into the 9xtreme radio..

João
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Safe Power Switch For 9xreme.zip
(198.51 KiB) Downloaded 3 times
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by jhsa » Sun May 21, 2017 1:02 pm

Hold on a bit.. I just found out that we might get away with only one Mosfet with the 9xtreme board..
The Ar9x board would be more complicated as it already has one protection diode, in the right place if you use the normal switch, but in the wrong place if using this circuit.. :)

Working on it..

João
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jhsa
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by jhsa » Sun May 21, 2017 1:47 pm

Ok, I think this might work.. Will build one later or tomorrow :) but first will breadboard it.
Actually my 9xtreme has no safe switch protection. :) Yet :D

João
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Safe Power Switch For 9xtreme_Single Mosfet..png
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MaartenH
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by MaartenH » Mon May 22, 2017 6:31 am

You have don a lot of work again João! It keeps better and better..:-)

I will have a look for a program, the one I used in the past, to see if it is still free to use.

I have a question: is the 6 pin connector missing from the PCB? Or do you have a other way of connecting the board to the radio?
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jhsa
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by jhsa » Mon May 22, 2017 8:21 am

You get a 2mm pitch (I think) 6 pin/wire extension with the right connector.
Then solder the wires to the new switch board. The connector connects to the motherboard.
Will build one or two boards today.
I breadboard tested it last night and it seems to work ok.

João

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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by jhsa » Tue May 23, 2017 12:25 am

Ok, built a board. Will connect it to an original 9x mainboard and test. of course will also test reverse polarity.. Cross your fingers :) it shouldn't be a problem though ;)

here are some pics

João
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Photos.zip
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MaartenH
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Re: 9X (and possibly 9XR/PRO) Switch Board Design

Post by MaartenH » Tue May 23, 2017 6:44 am

Incredible how fast you made this!! (you just never sleep, right?!) :shock:

Looks nice and I hope you will not frie the 9x board...! I have my fingers crossed... :D

I assume you have a 9X board to test it on? Otherwise I can also test it of cource.

Maarten
Turnigy 9X - 9Xtreme board - M9 Gimbals

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