Search for Replacement 9x Potentiometers!

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jhsa
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Re: Search for Replacement 9x Potentiometers!

Post by jhsa » Sun Apr 26, 2015 12:37 pm

Hey great guide thank you very much. I still didn't get around to write one but now I don't need to :) yours is excellent..
I also like your solution with the PCB,s soldered to the pot housing..
My sensors are mounted on a bit of stripboard that is screwed to the gimbal plastic frame. The only advantage I see over your way is that if the pot housing moves my sensor will not move with it and have no effect on the stick position. But that problem could be solved with a bit of hot glue anyway..

As I said, your guide is excellent but allow me to make a couple comments. Constructive comments obviously :)

1 - Maybe it is worth mentioning that we have to grind the 2 little pins where the pot spring was attached to. I can see on your photos that you did it but you didn't mention it on the guide as far as I can see? This is important as it will allow the magnet to be flat on that plate inside the pot..

2 -
It takes some time and patience until the magnet is perfectly
centered and the distance magnet – Hall sensor always remains the
same during stick movement.
This is very very very important to make the stick movement linear. Time should be spent to center the magnet really well on the shaft. failing to do this could result on a non linear movement of the servo. Something like positive, or negative expo depending on the situation.

How did you manage to fit the magnet inside the inner plastic part only by shaving it inside? :o
On mine I did have to cut a hole.. hmmm, or maybe not :mrgreen: I can see that the wall on yours seem to be really thin ;) Well done..

3 -
During my attempts I could relatively easily adjust it to 0.12 V minimum and 4.93 V maximum.
I would like to know how you did achieve this.. Do you have the same magnets I linked above? The same I use? I'm also using the same sensor I think. The Allegro A1302.
But I was never able to achieve those values with these magnets. Only with a much smaller one.
My sensors are nearly touching the magnet. I think the voltage range I could get out of my assembly is in average 0.5 to 4.5V, or even less sometimes. I remember having 3.5 or 3.6 volts useful range sometimes.. :) It still gives a quite good resolution, better than a crappy pot :) :mrgreen:

4 -
Depending on how the magnet was placed, it can happen that the stick movement in the transmitter is inverted that e. g. maximum throttle is not at stick full up but at full down.
In the transmitter setup this can be inverted again for each stick channel separately. Hence it's not necessary to take that aspect into account when positioning the magnets.
ATTENTION HERE. Only er9x has the ability of inverting the stick direction as far as I know. So if you use other firmware like openTX for example, you will have to make sure the magnets are placed to give the correct stick direction.. I did that on mine. You should get maximum voltage from the sensor when the sticks are fully to the right and up. If they are not, rotate the magnet 180 degrees to invert the poles.

Congratulations, you did it in a much cleaner way than the way I did. It would be nice if you could post the PCB files so others could also make them? That would be great..
It is not that difficult to replace the pots with the hall sensors, but it requires some patience. :)

Ahh, on mine I had to set the springs a bit tighter to get the best centering. But the mechanics of the 9x radio has a lot of play, I guess. On one of my gimbals the pot shaft would move up and down inside the housing. Not good. I had to replace it with another pot housing.
Thank your for your guide

Now to find a way to do it to my 9XR pro as it has the worst centering of all my radios :(
Your idea might suit the 9xr gimbals better than mine..

João
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Re: Search for Replacement 9x Potentiometers!

Post by NicoSausB » Sun Apr 26, 2015 1:37 pm

jhsa wrote:Hey great guide thank you very much. I still didn't get around to write one but now I don't need to :) yours is excellent.
Thank you very much! That's very kind.
jhsa wrote:The only advantage I see over your way is that if the pot housing moves my sensor will not move with it and have no effect on the stick position. But that problem could be solved with a bit of hot glue anyway.
Yes, you're right. Fortunately on my 9X all pots fit very tight and don't move during stick movement. Lucky me!
jhsa wrote:As I said, your guide is excellent but allow me to make a couple comments. Constructive comments obviously :)
Yes please, every comment is very welcome!
jhsa wrote:1 - Maybe it is worth mentioning that we have to grind the 2 little pins where the pot spring was attached to. I can see on your photos that you did it but you didn't mention it on the guide as far as I can see? This is important as it will allow the magnet to be flat on that plate inside the pot.
You are right, I missed to mention it.
I used my Dremel to cut it away and to roughen the surface.
jhsa wrote:How did you manage to fit the magnet inside the inner plastic part only by shaving it inside? :o
On mine I did have to cut a hole.. hmmm, or maybe not :mrgreen: I can see that the wall on yours seem to be really thin ;) Well done..
Yes, the remaining plastic is really very thin. Bright light is shining through...
jhsa wrote:3 -
During my attempts I could relatively easily adjust it to 0.12 V minimum and 4.93 V maximum.
I would like to know how you did achieve this.. Do you have the same magnets I linked above? The same I use? I'm also using the same sensor I think. The Allegro A1302.
But I was never able to achieve those values with these magnets. Only with a much smaller one.
My sensors are nearly touching the magnet. I think the voltage range I could get out of my assembly is in average 0.5 to 4.5V, or even less sometimes. I remember having 3.5 or 3.6 volts useful range sometimes.. :) It still gives a quite good resolution, better than a crappy pot :) :mrgreen:
Perhaps it was only good luck?
I used the same magnets (from your link) and simply placed them.
Perhaps the component tolerances are quite high? I don't know - it simply worked well from the beginning.
jhsa wrote:4 -
Depending on how the magnet was placed, it can happen that the stick movement in the transmitter is inverted that e. g. maximum throttle is not at stick full up but at full down.
In the transmitter setup this can be inverted again for each stick channel separately. Hence it's not necessary to take that aspect into account when positioning the magnets.
ATTENTION HERE. Only er9x has the ability of inverting the stick direction as far as I know. So if you use other firmware like openTX for example, you will have to make sure the magnets are placed to give the correct stick direction.. I did that on mine. You should get maximum voltage from the sensor when the sticks are fully to the right and up. If they are not, rotate the magnet 180 degrees to invert the poles.
OK, that's good to know.
I'll take this into account for the next revision of my report.
jhsa wrote:It would be nice if you could post the PCB files so others could also make them? That would be great..
Oh yes, I forgot to attach the files I got from my buddy.
jhsa wrote:Ahh, on mine I had to set the springs a bit tighter to get the best centering. But the mechanics of the 9x radio has a lot of play, I guess. On one of my gimbals the pot shaft would move up and down inside the housing. Not good. I had to replace it with another pot housing.
Unfortunately there is really a lot of play and it seems I'm one of the luckier guys with less play and better fitting parts.

Thank you very much for the many useful suggestions and kind words!

Regards,
Nico

NicoSausB
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Re: Search for Replacement 9x Potentiometers!

Post by NicoSausB » Sun Apr 26, 2015 1:38 pm

OK, here is the PCB layout I got from my buddy who made the PCBs. It's already mirrored.
And additionally a simple component placement scheme for the PCBs.
Attachments
components placement TH-9X Hall sensor holders.pdf
(187.99 KiB) Downloaded 254 times
PCB layout for TH-9X Hall sensor holders.pdf
(41.46 KiB) Downloaded 235 times

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MikeB
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Re: Search for Replacement 9x Potentiometers!

Post by MikeB » Sun Apr 26, 2015 1:59 pm

I just ran up openTx companion and selected the 9X. In the general settings there are options to reverse the sticks.

Mike.
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The difficult we do immediately,
The impossible takes a little longer!

NicoSausB
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Re: Search for Replacement 9x Potentiometers!

Post by NicoSausB » Sun Apr 26, 2015 2:08 pm

OK, so it's not necessary to take the magnets polarity into account? er9x and OpenTx both allow to invert the stick channels?


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jhsa
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Re: Search for Replacement 9x Potentiometers!

Post by jhsa » Sun Apr 26, 2015 2:30 pm

It looks like it.. I didn't know. It's been a while since I've used opentx. I was wrong on that one, sorry..

João
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Re: Search for Replacement 9x Potentiometers!

Post by NicoSausB » Tue Apr 28, 2015 2:25 pm

FYI:
I've revised my conversion reports a little bit to consider the helpful comments of João.
Please see my original posting.

Regards,
Nico

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Re: Search for Replacement 9x Potentiometers!

Post by ferdian14 » Wed May 06, 2015 5:42 pm

i got problem with my potentiometer, i already read some article make me confused what i'm supposed to do to replace my potentiometer in my 9x,
i cannot fully understood in english and also bad with my experience about electro :(

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Re: Search for Replacement 9x Potentiometers!

Post by ferdian14 » Fri May 08, 2015 9:26 am

hello NicoSausB, i got problem in my country, many times i spend to search that magnet with your specification nothing, cannot buy to from abroad, no shipping to indonesia and so expensive. :(

the all type magnetics neodymium are diametrical ?

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jhsa
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Re: Search for Replacement 9x Potentiometers!

Post by jhsa » Sun May 10, 2015 5:32 am

You might have a better option where you live then.. Hobbyking sells the Taranis radio gimbals that also fit the 9x radio. Don't know if they have it at the moment.

João
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Re: Search for Replacement 9x Potentiometers!

Post by NicoSausB » Sun May 10, 2015 3:55 pm

ferdian14 wrote:the all type magnetics neodymium are diametrical ?
No, diametrically magnetized ring magnets are quite rare and not really usual.

I agree with João and would recommend the Taranis gimbals as high quality replacement.

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Re: Search for Replacement 9x Potentiometers!

Post by Wimh » Sun May 24, 2015 11:57 am

Wim
Belgium

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jhsa
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Re: Search for Replacement 9x Potentiometers!

Post by jhsa » Sun May 24, 2015 12:58 pm

No Price? is it available at all? That internet site is absolutely terrible..
How do they want to sell stuff like this??

João
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Re: Search for Replacement 9x Potentiometers!

Post by Wimh » Mon May 25, 2015 12:57 pm

Available Juli or so, will have price then...
Wim
Belgium

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jhsa
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Re: Search for Replacement 9x Potentiometers!

Post by jhsa » Mon May 25, 2015 2:01 pm

Thanks. They say it fits many radios, including some chinese radios as far as I understand.. Lets see if it fits the 9x and what the price is.. ;)
It woild be wonderful if they fit the 9XR as the gimbals are the weakest point on that radio. Apart from that it is a great radio..

João
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Re: Search for Replacement 9x Potentiometers!

Post by chewy » Fri Sep 18, 2015 6:17 am

i found this potentiometer.
http://www.aliexpress.com/item/SA-TBM-g ... 22514.html
What do you think about this product?

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Re: Search for Replacement 9x Potentiometers!

Post by bob195558 » Wed Sep 23, 2015 12:53 am

Hi chewy,
They look to be very similar, not able to see any dimensions for them.
Cost is a lot at $62.90 for 10.
Can and seems better to purchase Taranis Gimbals for $31.49. ;) :)

Bob B.
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
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Re: Search for Replacement 9x Potentiometers!

Post by Kilrah » Wed Sep 23, 2015 1:13 pm

And nowhere does it actually mention they are 60° pots like required.

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skybreaker
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Re: Search for Replacement 9x Potentiometers!

Post by skybreaker » Sat Oct 17, 2015 9:42 pm

You can buy directly from Flysky
[email protected]
http://www.flysky-cn.com/efaq.asp

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Re: Search for Replacement 9x Potentiometers!

Post by ddosoff » Wed Dec 09, 2015 11:11 am

It can be replaced with SS495A1 hall effect sensors or similar ones.

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jhsa
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Re: Search for Replacement 9x Potentiometers!

Post by jhsa » Wed Dec 09, 2015 11:56 am

I think the person who did that mod installed the sensor incorrectly. It seems to have the back turned to the magnet. The other side of the sensor should be turned to the magnet I believe :o
But maybe I'm not seeing it right :)

João
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Re: Search for Replacement 9x Potentiometers!

Post by adp75 » Tue Jan 12, 2016 3:28 am

9x Potentiometers
Please look at Aliexpress.com At this sight search " B502 B5K 60 degree potentiometer"
These look to identical back plates and will work if carefully replaced, if your wiper is poor you may be able to replace it to.

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Re: Search for Replacement 9x Potentiometers!

Post by bob195558 » Tue Jan 12, 2016 2:11 pm

Hi adp75,
I have found where they are (http://www.aliexpress.com/item/BELLA-CF ... 18400_6150)
and they are not the same and they have no sizes so we can not compare them to the 9x potentiometers.
Then they cost a lot too and you would still have unreliable potentiometers after that.
Thank you for posting your find as these look to be the closes potentiometers that maybe able to work and are sold by them selves too. :)

Much better to upgrade to the Taranis Gimbals: (https://alofthobbies.com/frsky-taranis- ... imbal.html) as they are reliable. :D

Bob B.
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).

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Re: Search for Replacement 9x Potentiometers!

Post by adp75 » Wed Jan 13, 2016 5:03 pm

Hi Bob,
Sorry for the long link

http://www.aliexpress.com/item/1-PCS-B5 ... 18400_6151

These are the ones I looked at. The dia. is 13mm, the depth is 5mm. same as the 9x. the shafts are to long. Cost US $1.52 These are the exact same as the pots in a Heli-Max AxeCP Tx. I used the back plate from one to fix my 9x years ago. I don't think the original 9x firm wear can revers sticks, so this is a option.
If the pins have to be bent, then I would defiantly use rear window defog fix on the eyelets, this I did.

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Re: Search for Replacement 9x Potentiometers!

Post by bob195558 » Wed Jan 13, 2016 7:57 pm

Hi adp75,
This is definitely a Good find!
You are the first and only one to find these Replacement 9x Potentiometers! 8-)
I have added this info to the first post so other maybe able to find them if
they choose to purchase these Replacement 9x Potentiometers.
Return to first post: (viewtopic.php?f=95&t=2974&p=42713#p42713).

adp75, good job :D thank you for posting them here! :)

Added note: These are not the exact 9x potentiometers, as the shafts length (barrel length) are to long to fit into the stock 9x gimbals.
But you maybe able to dissemble these and use there parts to repair your damage 9x potentiometers.


Bob B.
Last edited by bob195558 on Sun Jan 17, 2016 12:38 pm, edited 1 time in total.
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).

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Re: Search for Replacement 9x Potentiometers!

Post by adp75 » Sun Jan 17, 2016 2:52 am

Hi Bob B,
Thank you for the kind reply, just trying to help out these are great radios!
Question on the same subject. Using the non amplified Taranis gimbal on a standard 9X, is the resolution the same because they are not 5K. It would seem to me that they would be the same at both ends, but much more sensitive to stick movement in the middle. Also can you change the stick direction by changing the outside 2 pot wires?
Thank you
Darryl

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Search for Replacement 9x Potentiometers!

Post by Daedalus66 » Sun Jan 17, 2016 3:39 am

If you are going to the trouble of upgrading the sticks, you should also upgrade to ER9x. You then have a firmware solution to reversed sticks. And we know the the Taranis sticks work perfectly with that firmware.

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jhsa
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Re: Search for Replacement 9x Potentiometers!

Post by jhsa » Sun Jan 17, 2016 7:45 am

Latest versions of the gimbals don't use the amplifiers, only the pots. At least I didn't read any report saying the opposite.
So you can just swap the outside wires yes.
It's always a good idea to measure them, just to make sure ;)

João
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Re: Search for Replacement 9x Potentiometers!

Post by ShowMaster » Sun Jan 17, 2016 3:35 pm

Over the past years I ordered new stick and trim assemblies complete with pots, from hobbypartz. I contacted their customer service Dept and just asked if I could order FS-9X parts. They were very helpful and actually ordered 2 sets (4) and 2 battery covers for me. The cost was $4 each pair of sticks and $1-2 each cover including shipping at that time. My last order was 2014. I bought the sticks because the pots end connection would fail. I later came up with a easy fix if you're willing to fully disassemble the stick to get to the pot element.
I have no idea if hobbypartz can or will order 9X parts in 2016 but then again, everyone posted back in 2012 that no parts could ever be ordered? I just contacted many venders selling a 9x and got lucky on the 3rd try.
Same for the pot fix. If the element is not gouged or cracked, it should be a simple fix.

I do agree that the Taranis stick upgrade may be that, a upgrade as well as a fix. Something to try since its been successfully done by many now to guide you.
FYI. Good luck!
http://www.hobbypartz.com/

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Re: Search for Replacement 9x Potentiometers!

Post by adp75 » Sun Jan 17, 2016 10:49 pm

Good Day, Show Master.
Wow who new hobbypartz.com would sell parts. I think I'm extremely fortunate, when installing back light and ER9x I took all the gimbals apart and used rear window defog epoxy on all eyelets, then lubed them with a drop of scorpion motor oil. (Check other oils with a ohm meter because some conduct.) That was 4 years ago and to this day they go -100 - 0 - +100 can let them snap back or return slowly, love it. I have found a 60 degree pot in the same housing but the shaft is to long.( Look for adp75 Jan 13 /16 ). I have fought with a lot of pots starting with a EK Logitrol, not good. Yet I have a Kraft 7C that I 2.4 and pots are perfect to this day , they are huge by todays standards but the resolution is unbelievable.
Sorry to be the fly in the ointment but the Taranis stick pots look to be exactly like my Futaba 6Ex , and nope don't have a long life. But then again they could be completely different and last a very long time, here's hoping!
Thank you all for your info, It's nice having people share info, instead of complaining.
Darryl


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