[DIY] 9X/9XR replacement pots (from DigiKey)

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[DIY] 9X/9XR replacement pots (from DigiKey)

Postby jarekk » 27 Mar 2013, 03:05

Hi,

In other thread I have promised to share my receipt to replace 9XR standard potentiometers with some oridinary ones ( available from many sources, e.g. DigiKey )

Here how it looks - gimbal taken out from Turnigy 9XR
Image

The bottom view (note - in this one I have already detached cable from one of potentiometers):
Image

Takeing out - first you need to take out the metal protection:

Image

The potentiometer (just gently pull it out):
Image

Is it ordinary one ? Unfortunately not.
Once you make something really cheap (but in large quantities) you count cost of each single component. Somebody has counted that ordering OEM type would save money.
So you get small linear type potentiometer 5kOhm with 100deg working range ( which is very unusal - most have 270..300 deg).
There is absolutely no way you can get it in small volumes ( below 1000pcs ), the easiest way is to buy another T9X/T9XR for parts.

But - there is something you can adapt.

Image Image
http://www.digikey.com/product-detail/e ... ND/1088211 ( datasheet http://www.bourns.com/pdfs/3310.pdf )

It is quite good quality conductive plastic type of potentiometer. You do not need 5k - anything in range 5k..50k is reasonable ( as it is connected directly to GND, 5V and processor adc input).
There are several options ( different output pinout) - it does not really matter.

The differencies ( mechanical) are small and sand paper/knife/dremel will fix them all:
- the bushing is a bit too large ( about 0.2mm ) - use sand paper or knife to adjust it, so you can put it into gimbal with reasonable small force
- the shaft is a bit too small ( again about 0.2mm) - I use a bit of stick thermal glue to fix it
- the shaft has to be flattened ( only a bit - be carefull)

So you need to shape it a bit - dissassembly gimabl to check it all
Image
Make sure it also fits the assembly hole.
Image

I recommend:
- Put some glue into the assembly hole ( I have used my glue gun)
- Put gimbal parts together ( in fast way) and install the potentiometer. Wait until it cools down
- Note following
+ The potentiometr has to be setup to 50% of its scale - have it in mind when flattening the shaft (important)
+ Check the assembly hole to see which part of the shaft needs to be flattened - the potentiometer connections should be going "up" ( opposite direction of the stick)
+ Check how much you can push the potentiometer - cannot be too much as it will create too much friction for its smooth operation.

Image
Solder cables, protect them with glue. Do not use too much - there is little space in the housing. If you put too much, it will bend the potentiometer and cause lausy operation ( as potentiometer shaft will not be in line of gimbal axis)

Now - connect the cable, calibrate sticks and enjoy.

Beware:
- If the sticks operates "wrong" way - means you have messed the cables ( keep the middle, reverse the others)
- Using this potentiometer reduces resolution of gimbal - to 1/3 of orignal ( from about 1000 adc units to about 350 )

About the resolution - you are faceing similiar problem as people using Aurora gimbals ( see http://openrcforums.com/forum/viewtopic.php?f=7&t=929 )

I have implemented their curcuits to get the resolution back:

Image

Heatshrink pipe over circuit molded in thermo glue
Image

Looks ugly, but it works.

Just a comment
Image

With aurora gimbals you get precisely 50% in idle position. Adding our pot does not guarantee it ( as it depends on assembly and shaft flattening).
So make the circuit with standard values ( 2x10k and 18k) and later on adjust "zero" by turning the pot and thermal glue again :-)
This is needed to keep the operation range within 0..5V ( original potentiomter uses range 1.5...3.5V)
jarekk
 
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Joined: 22 Mar 2013, 20:32

Re: [DIY] 9X/9XR replacement pots (from DigiKey)

Postby jiuer7845 » 08 Aug 2018, 10:23

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Re: [DIY] 9X/9XR replacement pots (from DigiKey)

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