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The iBasso DX50 Thread - Latest firmware: 1.5.0 - Page 888

post #13306 of 15233
Quote:
Originally Posted by musicheaven View Post
 

Sorry to disappoint you but the DX50 does have DC coupling caps on both the HO and LO for a total of 4 caps, one on each channel. You can use 200 uF cap replacement (that is the electrolytic value on those caps), may I suggest some of film variety? You may be able to find supercaps rated at or a higher level, that would work even wonder. Just remember that hand soldering is a must and they are really tightly placed close to each other so the space is rather limited. Don't bother calling iBasso if you DX50 dies after the caps have been replaced unless you are skillful enough to move the older caps back with shorter leads in place. :biggrin:

Thank you, I just saw the PCB photos now. 4x 220 uF / 10V electrolytic THT capacitors. On the bottom side are even two more (golden color). It looks like the silver ones are 2x 2 pcs in parallel for L/R headphone out, and the golden ones could be for the line out.

I think these 440uF per channel are big enough for the Headphone out and the bass extension won't be much better with bigger caps (sorry, i'm too lazy to do the calculations). Foil caps you won't find with a high capacitance that fit inside the case. You could shorten the caps and build an extra adapter cable outside, but never ever forget this adapter (and maybe the relay will not even switch on if it is part of a DC-Protection circuit).

This soldering work is not a problem for a experienced solderer.

 

good luck IceOgre


Edited by cholero - 5/26/14 at 5:03am
post #13307 of 15233
Thread Starter 
Quote:
Originally Posted by cholero View Post
 

Thank you, I just saw the PCB photos now. 4x 220 uF / 10V electrolytic THT capacitors. On the bottom side are even two more (golden color). It looks like the silver ones are 2x 2 pcs in parallel for L/R headphone out, and the golden ones could be for the line out.

I think these 440uF are big enough for the Headphone out and the bass extension won't be much better with bigger caps (sorry, i'm too lazy to do the calculations). Foil caps you won't find with a high capacitance that fit inside the case. You could shorten the caps and build an extra adapter cable outside, but never ever forget this adapter (and maybe the relay will not even switch on if it is part of a DC-Protection circuit).

This soldering work is not a problem for a experienced solderer.

 

good luck IceOgre

 

There are a couple of caps I would not substitute just because it is not going to help much, those are wired on the underside of the board, not the ones close to the output connectors.

 

Kemet makes some of the best capacitors and they have a supercap small enough to replace the 220 uf plus a variety of other caps using different dielectric material, I have used a few of their products on daps and they work wonder.

post #13308 of 15233

Tactile switch: Digi-key part number is EVQ-P7C01P

Part number for the lock sliding switch is:  SK-12C0405-SG 1.5 RT

 

I also have to change these switch previously... it's work!

post #13309 of 15233

I have heavily modded my DX50, and this some of my results:

- no film capacitors can be fitted inside, too small

- I try lot of HO output caps but I finally use AVX Oxicaps #NOSD227M006R0100 (4), the best low-mid and low-end, somewhat colored and dark, but superb details and dynamic

- The Nichicon FW 220uF 35V (UFW1V221MPD1TD) is also very good; more natural, less colored, but lack details and precision

- I changed the output HO op amps for LME49710MAX (2); greater transparency

- I also changed the summing amplifier next to the Wolfson DAC, i use an LME49721MA (best modification to make for LO output)

 

Notes:

- the HO output cap modification is somewhat easy but any others modifications is reserved to skilled technician (removing Op-amp...)

- I use an HD650 headphone for my test; your results will vary with others kind of phones (and ears, and taste)

- Allow at least 24Hr of burn-in before ay serious evaluation (capacitors)

- change one thing at time, evaluate, change another thing, evaluate...

post #13310 of 15233
Quote:
Originally Posted by babs View Post
 

I have heavily modded my DX50, and this some of my results:

- no film capacitors can be fitted inside, too small

- I try lot of HO output caps but I finally use AVX Oxicaps #NOSD227M006R0100 (4), the best low-mid and low-end, somewhat colored and dark, but superb details and dynamic

- The Nichicon FW 220uF 35V (UFW1V221MPD1TD) is also very good; more natural, less colored, but lack details and precision

- I changed the output HO op amps for LME49710MAX (2); greater transparency

- I also changed the summing amplifier next to the Wolfson DAC, i use an LME49721MA (best modification to make for LO output)

 

Notes:

- the HO output cap modification is somewhat easy but any others modifications is reserved to skilled technician (removing Op-amp...)

- I use an HD650 headphone for my test; your results will vary with others kind of phones (and ears, and taste)

- Allow at least 24Hr of burn-in before ay serious evaluation (capacitors)

- change one thing at time, evaluate, change another thing, evaluate...

can you show us some pics? =D

post #13311 of 15233
Quote:
Originally Posted by babs View Post
 

I have heavily modded my DX50, and this some of my results:

- no film capacitors can be fitted inside, too small

- I try lot of HO output caps but I finally use AVX Oxicaps #NOSD227M006R0100 (4), the best low-mid and low-end, somewhat colored and dark, but superb details and dynamic

- The Nichicon FW 220uF 35V (UFW1V221MPD1TD) is also very good; more natural, less colored, but lack details and precision

- I changed the output HO op amps for LME49710MAX (2); greater transparency

- I also changed the summing amplifier next to the Wolfson DAC, i use an LME49721MA (best modification to make for LO output)

 

Notes:

- the HO output cap modification is somewhat easy but any others modifications is reserved to skilled technician (removing Op-amp...)

- I use an HD650 headphone for my test; your results will vary with others kind of phones (and ears, and taste)

- Allow at least 24Hr of burn-in before ay serious evaluation (capacitors)

- change one thing at time, evaluate, change another thing, evaluate...

I've wondered if it'd be possible to remove the DX50's amp entirely and use the rest of the space for a better line out/more storage/bigger battery/etc because I bet some of us (e.g. me) don't even use the amp section anymore. Seeing that list of mods makes me even more curious as to whether something like that could be done or not!

post #13312 of 15233
Thread Starter 
Quote:
Originally Posted by babs View Post
 

I have heavily modded my DX50, and this some of my results:

- no film capacitors can be fitted inside, too small

- I try lot of HO output caps but I finally use AVX Oxicaps #NOSD227M006R0100 (4), the best low-mid and low-end, somewhat colored and dark, but superb details and dynamic

- The Nichicon FW 220uF 35V (UFW1V221MPD1TD) is also very good; more natural, less colored, but lack details and precision

- I changed the output HO op amps for LME49710MAX (2); greater transparency

- I also changed the summing amplifier next to the Wolfson DAC, i use an LME49721MA (best modification to make for LO output)

 

Notes:

- the HO output cap modification is somewhat easy but any others modifications is reserved to skilled technician (removing Op-amp...)

- I use an HD650 headphone for my test; your results will vary with others kind of phones (and ears, and taste)

- Allow at least 24Hr of burn-in before ay serious evaluation (capacitors)

- change one thing at time, evaluate, change another thing, evaluate...

 

I'd like to differ on the caps, I have installed 4 caps including the ones I said one should not do and they all fit nicely in the DX50, they are not electrolytic type. Once I have a minute, I'll publish the cap specs (see below). What I could hear when the caps were changed is a flatter and wider fr but pretty much as a dap that was not burned in yet.

 

The above mods are pretty daring, mind you that you are talking about surface mounted components that are precisely mounted and spot soldered in a manufacturer so doing it by hand requires a lot of dexterity in order not to solder adjacent connections. Photos are definitively required to see your amazing job, I wish I could hear this mod.  

 

 

Quote:
Originally Posted by BucketInABucket View Post
 

I've wondered if it'd be possible to remove the DX50's amp entirely and use the rest of the space for a better line out/more storage/bigger battery/etc because I bet some of us (e.g. me) don't even use the amp section anymore. Seeing that list of mods makes me even more curious as to whether something like that could be done or not!

 

The line out is already well designed but I got your point, switching the amps might yield a better output. The battery case, it's all metal casing and the bottom section where you could potentially enlarge the case, this is where the caps sit so little space is available to increase the battery size. The only dimension you can go is thickness but we all know where that leads. To be totally frank, the case is rather small and already packed, the only substitution is switching op amps and buffers.

 

 

Edit: Those were newly manufactured Tantalum Capacitors - Polymer SMD from Kemet part number:T530D227M006ATE005 220 uF, 6.3volts with an ESR of only 5 mOhms (extremely low leakage). 3.1 mm high by 7.3 mm long by 4.3 mm wide.

 

Edited by musicheaven - 5/26/14 at 10:28am
post #13313 of 15233

I am a professional electronic ing. and a deal each day with even smaller SMT components

But, yes, soldering these parts need appropriate experience a a good equipment

do not try it if you have no experience, you must know what you're doing

 

But removing and changing the 4 output capacitor is pretty easy for a good handyman, and really improve the SQ

 

if you can specify the cap you use, maybe i will try it, its interesting...

i will try to find some pictures of my mods

post #13314 of 15233
Quote:
Originally Posted by BucketInABucket View Post
 

I've wondered if it'd be possible to remove the DX50's amp entirely and use the rest of the space for a better line out/more storage/bigger battery/etc because I bet some of us (e.g. me) don't even use the amp section anymore. Seeing that list of mods makes me even more curious as to whether something like that could be done or not!

 You could save maybe some battery life if you disconnect the amp section. It is possible that there is a step up converter (higher voltage power supply) which only needed by the headphone amp. In that case, the step up converter could be disconnected to save power. Maybe someone who opened the player could give more information about power supplies. But don't count on usable space for other things... 

post #13315 of 15233
Quote:
Originally Posted by babs View Post
 

I have heavily modded my DX50, and this some of my results:

- no film capacitors can be fitted inside, too small

- I try lot of HO output caps but I finally use AVX Oxicaps #NOSD227M006R0100 (4), the best low-mid and low-end, somewhat colored and dark, but superb details and dynamic

- The Nichicon FW 220uF 35V (UFW1V221MPD1TD) is also very good; more natural, less colored, but lack details and precision

- I changed the output HO op amps for LME49710MAX (2); greater transparency

- I also changed the summing amplifier next to the Wolfson DAC, i use an LME49721MA (best modification to make for LO output)

 

Notes:

- the HO output cap modification is somewhat easy but any others modifications is reserved to skilled technician (removing Op-amp...)

- I use an HD650 headphone for my test; your results will vary with others kind of phones (and ears, and taste)

- Allow at least 24Hr of burn-in before ay serious evaluation (capacitors)

- change one thing at time, evaluate, change another thing, evaluate...

Hi. Would it be too much to ask if I asked you to post a picture of your circuit with arrows showing where you installed each of the new caps? Could you ellaborate on what would happen if you raised/lowered the value of determined cap? I'm very interested in this and I'm a curious self teacher of electronic. I'm dying to see it.


Edited by arvore - 5/26/14 at 9:00pm
post #13316 of 15233
Thread Starter 
Quote:
Originally Posted by babs View Post

I am a professional electronic ing. and a deal each day with even smaller SMT components
But, yes, soldering these parts need appropriate experience a a good equipment
do not try it if you have no experience, you must know what you're doing

But removing and changing the 4 output capacitor is pretty easy for a good handyman, and really improve the SQ

if you can specify the cap you use, maybe i will try it, its interesting...
i will try to find some pictures of my mods

Agreed and can't wait to see your pictures. I edited the above thread and added an additional suggestion, btw the AVX Oxicaps are a good choice, those have been used in some expensive iems I believe. I have four of them with me because of my hesitation between the above suggested caps. Let me know which one you prefer.

I would suggest however that if you are highly interested in DX50 mods to create a new thread about it. I don't think anyone has created one yet.
post #13317 of 15233

When is the new firmware coming?

 

The wait is so painful... :frown:

post #13318 of 15233
Quote:
Originally Posted by PChoon View Post
 

When is the new firmware coming?

 

The wait is so painful... :frown:



Very soon..however, It might be worth further waiting pain even if it is delayed further due to them trying their best to 'get it right'

 

Quote:
I would suggest however that if you are highly interested in DX50 mods to create a new thread about it. I don't think anyone has created one yet.

 

+1

 

That would be great.


Edited by polyrhythm - 5/27/14 at 3:49am
post #13319 of 15233

no longer using this: deleted.


Edited by polyrhythm - 5/28/14 at 6:01am
post #13320 of 15233
Thinking to have new IEM for my DX50, currently I'm using SE215. So far synergy between bright of DX50 and warm of SE215 produce .."OK sound (7/10)".
Tried to pair with RHA-MA750, the sound become so bright, loose the weight and thin.


Any suggestion warm IEM but have good detail for my DX50 (without ext amp)? smooth, little bit laid back
Bugdget <$150, music preference all kind of jazz
In my radar : TDK BA200 (I never listen dual balanced), RE400, GR07 MKII......
Edited by jazzwave - 5/27/14 at 11:10am
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