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FiiO X3 mod - AD8397 to AD8620 - Page 15

post #211 of 256
No ... No interfere with the firmware..i just want to add that ... Heat still there after a while of use ... Less than the stock one .. But it is there ... And with high gain it sound very bright
post #212 of 256
put a description of mods with photo pictures and explanations in this thread or create a new one?

Edited by SergBill - 8/19/14 at 2:25pm
post #213 of 256

Description and pics would be awesome!

 

I am on to lookout for a better line out. This looks like a good idea.

post #214 of 256
Quote:
Originally Posted by Benno View Post

Description and pics would be awesome!

I am on to lookout for a better line out. This looks like a good idea.
i think there is no better mod for the line out
post #215 of 256

By any change, is the schematic of the x3 available?

I could not find it but that might be because of my bad search skills..

Thanks!

post #216 of 256
Thread Starter 
Quote:
Originally Posted by Benno View Post
 

By any change, is the schematic of the x3 available?

I could not find it but that might be because of my bad search skills..

Thanks!

 

Schematic of the whole DAP? That's never going to happen.

post #217 of 256

is there any method to measure the THD values , S/N ratio and power in mw of the new opamp installed in the modded X3 compared to the original opamp ... as i want to know how the AD8066 which i installed in my X3 performs compared to the AD8397 :rolleyes: 

post #218 of 256
Quote:
Originally Posted by ClieOS View Post
 

Someone asked me to post the mod, so I thought I'll make it into an independent thread instead of putting it somewhere inside a X3 discussion.

 

Basically the mod is as simple as it gets: open the X3 up, disconnect the battery, desolder the AD8397, solder in the AD8620, and put everything back.

 

The goal is to remove the warmness from the AD8397 and replace it with something that sounds more neutral. AD8620 has been one of my personal favourite on portable amp, so it is my first choice. Another candidate will be OPA2209. Both will never be able to match the current output of AD8397 - however, realistically speaking, both already have more than enough output for typical headphone anyway (* = won't be suitable for low impedance, low sensitivity, hard-to-drive 'phone). From experience, OPA2209 probably won't sound as neutral as AD8620, but it should be a good middle point between AD8620 and AD8397 - as alternative for those who find AD8620 too bright to their taste. Another side benefit of the mod will be a likely extended battery life, since both opamps draw less power than AD8397.

 

X3m-01.jpg

AD8620 on top of X3, just for size reference.

 

X3m-02.jpg

Be careful on the hold switch (just next to the silver battery). You need to see how it comes off so you will know how to put it back.

 

X3m-03.jpg

Pull the battery connector out before any mod.

 

X3m-04.jpg

The stock AD8397, just under the yet-to-solder AD8620. Do check the orientation carefully before desoldering / soldering!

 

X3m-05.jpg

Done. Put everything back together now. If X3 shows some error on headphone connection, that means you have weak solder joint and you should retouch them with the iron.

 

Note: Desoldering SMT is far harder than soldering. If this is your first SMT project, I seriously think you should practice on other thing first. The way I do is pretty much destructive to the original opamp, as I heated and pry a leg at a time, so they either break off or bend out of shape completely. I am sure there are far more elegant and least destructive way of doing it, just search youtube and you should find quite a few of the tutorials. I am however too lazy to bother, as I have some spare AD8397 around and don't need to save this one.

 

The result is as I have expected, a much more neutral and detail presentation. I can almost compare it to the X3's line-out + O2. Well worth the effort as this finally brings out the transparency of the player than is somewhat hindered by the AD8397's warmness. Now the new X3 is a proper AK100 killer.

Sorry guys, I need some help.
I've ordered the AD8620 and a friend has done the work for me. But instead of desolder the AD8397, he desorder another component (the identical piece in the middle of the circuit).
When I notice that, we solder the component in the original place, but when I plug the headphones X3 send me an error (something like "output error! please reinsert headphones"). We retry to sold the component with a 180 degree rotation, but the result is the same.
What is that component? What can I do to solve the problem? I have to reorder it?
I want to specify that in line-out the X3 works perfectly.
Thanks, Mattia

post #219 of 256
Quote:
Originally Posted by v4ever16 View Post

Sorry guys, I need some help.

I've ordered the AD8620 and a friend has done the work for me. But instead of desolder the AD8397, he desorder another component (the identical piece in the middle of the circuit).

When I notice that, we solder the component in the original place, but when I plug the headphones X3 send me an error (something like "output error! please reinsert headphones"). We retry to sold the component with a 180 degree rotation, but the result is the same.

What is that component? What can I do to solve the problem? I have to reorder it?

I want to specify that in line-out the X3 works perfectly.

Thanks, Mattia
This is a common error appears because of a weak joint of soldering .. It requires to retouch your soldering with the hot iron to make sure that all legs are soldered well ( with its original orientation and direction ) .. I may advice you to replace that op amp with a newer one because all that soldering and disordering may affect the opamp negatively
post #220 of 256
Thread Starter 
Quote:
Originally Posted by v4ever16 View Post
 

Sorry guys, I need some help.
I've ordered the AD8620 and a friend has done the work for me. But instead of desolder the AD8397, he desorder another component (the identical piece in the middle of the circuit).
When I notice that, we solder the component in the original place, but when I plug the headphones X3 send me an error (something like "output error! please reinsert headphones"). We retry to sold the component with a 180 degree rotation, but the result is the same.
What is that component? What can I do to solve the problem? I have to reorder it?
I want to specify that in line-out the X3 works perfectly.
Thanks, Mattia

 

Which "component" are we talking here? AD8620 or the wrongly desoldered chip?

 

The chip your friend wrongly desoldered is LM2663, a voltage charge pump.. Rotate it 180 degree would have burnt the chip out for good. Same goes for AD8620. I'll also suggest you to replace the chips (both of them). If that still doesn't work, then you must have burnt some other things out and your X3 is pretty much gone for good.

post #221 of 256

In that case the wrongly desoldered chip, which is probably, as you said, the LM2663.
It's not a problem for me to reorder them, but I need to be sure about the component I need to order.

I've noticed that my "middle component" hasn't got the black dot for the orientation (as I can see from your original photo). Why?

https://drive.google.com/file/d/0B6ILhPiNX0UXcVU1U3VvcFdBN0E/view?usp=sharing


Edited by v4ever16 - 10/28/14 at 1:15am
post #222 of 256
Quote:
Originally Posted by v4ever16 View Post
 

In that case the wrongly desoldered chip, which is probably, as you said, the LM2663.
It's not a problem for me to reorder them, but I need to be sure about the component I need to order.

I've noticed that my "middle component" hasn't got the black dot for the orientation (as I can see from your original photo). Why?

https://drive.google.com/file/d/0B6ILhPiNX0UXcVU1U3VvcFdBN0E/view?usp=sharing

wrong turn  :bigsmile_face: 

post #223 of 256
Thread Starter 
Quote:
Originally Posted by v4ever16 View Post
 

In that case the wrongly desoldered chip, which is probably, as you said, the LM2663.
It's not a problem for me to reorder them, but I need to be sure about the component I need to order.

I've noticed that my "middle component" hasn't got the black dot for the orientation (as I can see from your original photo). Why?

https://drive.google.com/file/d/0B6ILhPiNX0UXcVU1U3VvcFdBN0E/view?usp=sharing

 

Take a close up picture of your X3 will help a lot, though newer stock of LM2663 comes with a sloped edge for orientation instead of dot.

post #224 of 256
Quote:
Originally Posted by ClieOS View Post
 

 

Take a close up picture of your X3 will help a lot, though newer stock of LM2663 comes with a sloped edge for orientation instead of dot.

Many thanks ClieOS.
I'll be at home on friday and I'll do all the photos.


Mattia

post #225 of 256

very interesting mod, do you know what the opamp supply rail voltages are?

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