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Teclast T51 - Page 93  

post #1381 of 1468
Quote:
Originally Posted by kiteki View Post
What is your mod idea with the Colorfly CK4?

similar modification, but I do not have in stock ck4 to check the quality of its food. With ck4 deployed later, but overall the sound is as good / better teklast (due to the presence of ASRC chip)

post #1382 of 1468
Quote:
Originally Posted by burnwaygta4 View Post

ok. I think the customer will be able to choose what to leave as a headphone amplifier. The default will be Ths4222.

That is a very good option, chose your priority, battery or SQ.

post #1383 of 1468
Quote:
Originally Posted by turokrocks View Post

That is a very good option, chose your priority, battery or SQ.


exactly. 

I will use the battery (one of my friends have already bought it and measure its size - apply): http://techno-room.ru/LP473850.html

 

Plan is to try a composite amplifier based on LM4562 + LT1207, but it requires more power and most likely it will not give raise to the level of quality Hi-Fi portable player. Unless the headphones are very "heavy". The same PCB is larger in size than ths4222.


Edited by burnwaygta4 - 12/10/12 at 4:13am
post #1384 of 1468

Hi. Could someone point up the right, compatible inverter for a Teclast T51 modification ? Here is the list .

post #1385 of 1468

http://ru.farnell.com/texas-instruments/tps60403dbvt/charge-pump-inverter-smd-60403/dp/8457786 - invetor appropriate. Only here a replacement inverter was not enough. A comprehensive fashion. The first 4 of the owner will receive their modified players in about 10 days. After that I'll be taking orders for the mod.

post #1386 of 1468
I completely finished the mod for Teclast T51/Sflo2 (TekMOD), details on the Russian site. If there is an interest in modifying, I will translation all the details
We briefly describe: the sound as good TOP portable players, the price in the $ 170, in the process of modifying possible repair / restoration of faulty players.
Also preparing modifications to Colorfly C4 + and C3.
Several photos final mode:
Quote:
Originally Posted by burnway;1102578 
img0298ec.th.jpg - PCB is the final ear amplifier
img0303cw.th.jpg - Ear amplifier assembled
dscf5884k.th.jpg - Assembled final mod

Edited by burnwaygta4 - 4/4/13 at 11:00am
post #1387 of 1468

Burnway, if the sound of Teclast after your mod at least 70% as good as Tec t51 -> line out -> Meier audio corda Quipstep, then you did great job man.

post #1388 of 1468

Hello Burnway, It's a new battery included in this mod ? What is the output impedance after the mod ?

post #1389 of 1468
Quote:
Originally Posted by Migou67 View Post

Hello Burnway, It's a new battery included in this mod ?

Yes, I set it in the player in the process of modification and is included in the price

 

Quote:
Originally Posted by Migou67 View Post

What is the output impedance after the mod ?

about 0, as the output amplifier ear NO resistors, thus I found protection from parasitic capacitance headphone cable

post #1390 of 1468
Quote:
Originally Posted by Dainity View Post

Burnway, if the sound of Teclast after your mod at least 70% as good as Tec t51 -> line out -> Meier audio corda Quipstep, then you did great job man.

I am sure that my modifications will sound better because the sound quality is much improved line-out, and the new ear amplifier does not spoil the sound of the line-out (There's more on the "heavy" headphones sound better)

post #1391 of 1468
 
 
 

Here is a brief description of the modifications on the Russian site I describe each item in great detail. If someone wants to talk in detail about it - write on burnwaygta4@gmail.com or Skype: burnwaygta4. I would like to stress that my fashion higher level than Storbmod and provides clearly better sound quality. Reviews and comparisons with the player AlexMod is the link that I gave earlier on a player.ru.
In short, are the comparisons: the difference in sound is minimal and hard to catch, though AlexMod was the maximum version and his price
800$.

 

Replacement / differences from stock:
 

  1.     replacement negative power inverters in headphones AMP and LPF
  2.     voltage regulators headphonesAMP and LPF with replacement filter capacitor Cbypass (is good for filtering high frequency interference)
  3.     an additional negative regulator shoulder headphonesAMP, along with the replacement of the capacitor in the inverter on Cfly X5R 4.7uF
  4.     replacement signal resistors located between DAC outputs and LPF
  5.     capacitors in the LPF replacement for ceramic NP0
  6.     replacement 10uF 1uF ceramic filters in power modulators DACs to 0,1 uF NP0
  7.     ceramic replacement shunts opamp LPF and headphonesAMP at 0,1 uF NP0
  8.     the signal from the low pass filter to the ear specialist now passes through the wire MC16-13(silver-plated copper) 0.05, cut lead-in track, contacts potentiometer raised and do not touch the board. Still have access to the line-out, installed protective resistors 50Om
  9.     removed the low quality resistors in the signal path to the headphonesAMP and line-out
  10.     increased power amplifier to your ear +-4V
  11.     filtering power before and after the dc-dc TD1410 (power supply for headphonesAMP)
  12.     opamp LPF LM4562
  13.    headphonesAMP made of LM4562+THS4222 - output up to 100mA per channel, 14mA quiescent current per channel(most portable headphones will work in Class A)
  14.     power cap for headphonesAMP is 2x220uF Panasonic FK, LPF 2x47uF Panasonic SU(bipolar capacitors with very low distortion)
  15.     measuring resonator 24MHz, the structure in tact CPU PLL, a generator with low jitter
  16.     stock replacement batteries for the assembly of two LP473850 1090mAh, setting equalizer to equalize pressures between the banks
  17.     sealed cables and sensor module aluminum tape to avoid interference on the part of the signal
 

Edited by burnwaygta4 - 4/6/13 at 3:28am
post #1392 of 1468
Quote:
Originally Posted by burnwaygta4 View Post

 
 
 

Here is a brief description of the modifications on the Russian site I describe each item in great detail. If someone wants to talk in detail about it - write on burnwaygta4@gmail.com or Skype: burnwaygta4. I would like to stress that my fashion higher level than Storbmod and provides clearly better sound quality. Reviews and comparisons with the player AlexMod is the link that I gave earlier on a player.ru.
In short, are the comparisons: the difference in sound is minimal and hard to catch, though AlexMod was the maximum version and his price
800$.

 

Replacement / differences from stock:
 

  1.     replacement negative power inverters in headphones AMP and LPF
  2.     voltage regulators headphonesAMP and LPF with replacement filter capacitor Cbypass (is good for filtering high frequency interference)
  3.     an additional negative regulator shoulder headphonesAMP, along with the replacement of the capacitor in the inverter on Cfly X5R 4.7uF
  4.     replacement signal resistors located between DAC outputs and LPF
  5.     capacitors in the LPF replacement for ceramic NP0
  6.     replacement 10uF 1uF ceramic filters in power modulators DACs to 0,1 uF NP0
  7.     ceramic replacement shunts opamp LPF and headphonesAMP at 0,1 uF NP0
  8.     the signal from the low pass filter to the ear specialist now passes through the wire MC16-13(silver-plated copper) 0.05, cut lead-in track, contacts potentiometer raised and do not touch the board. Still have access to the line-out, installed protective resistors 50Om
  9.     removed the low quality resistors in the signal path to the headphonesAMP and line-out
  10.     increased power amplifier to your ear +-4V
  11.     filtering power before and after the dc-dc TD1410 (power supply for headphonesAMP)
  12.     opamp LPF LM4562
  13.    headphonesAMP made of LM4562+THS4222 - output up to 100mA per channel, 14mA quiescent current per channel(most portable headphones will work in Class A)
  14.     power cap for headphonesAMP is 2x220uF Panasonic FK, LPF 2x47uF Panasonic SU(bipolar capacitors with very low distortion)
  15.     measuring resonator 24MHz, the structure in tact CPU PLL, a generator with low jitter
  16.     stock replacement batteries for the assembly of two LP473850 1090mAh, setting equalizer to equalize pressures between the banks
  17.     sealed cables and sensor module aluminum tape to avoid interference on the part of the signal
 

 

shiza. 

post #1393 of 1468
Quote:
Originally Posted by s1rrah View Post

 

shiza. 


what you mean by that?

post #1394 of 1468

i think he've ment that this is pure madness ))  he don't know what russian audiophiles can do to extract Warm Lamp Sound from their sources. i saw every single player was modded last 3 years (sometimes 2 or 3 modification to one DAP) in russian forums.

post #1395 of 1468

Really impressive, the result is promising happy_face1.gif

Quote:
Originally Posted by burnwaygta4 View Post

 
 
 

Here is a brief description of the modifications on the Russian site I describe each item in great detail. If someone wants to talk in detail about it - write on burnwaygta4@gmail.com or Skype: burnwaygta4. I would like to stress that my fashion higher level than Storbmod and provides clearly better sound quality. Reviews and comparisons with the player AlexMod is the link that I gave earlier on a player.ru.
In short, are the comparisons: the difference in sound is minimal and hard to catch, though AlexMod was the maximum version and his price
800$.

 

Replacement / differences from stock:
 

  1.     replacement negative power inverters in headphones AMP and LPF
  2.     voltage regulators headphonesAMP and LPF with replacement filter capacitor Cbypass (is good for filtering high frequency interference)
  3.     an additional negative regulator shoulder headphonesAMP, along with the replacement of the capacitor in the inverter on Cfly X5R 4.7uF
  4.     replacement signal resistors located between DAC outputs and LPF
  5.     capacitors in the LPF replacement for ceramic NP0
  6.     replacement 10uF 1uF ceramic filters in power modulators DACs to 0,1 uF NP0
  7.     ceramic replacement shunts opamp LPF and headphonesAMP at 0,1 uF NP0
  8.     the signal from the low pass filter to the ear specialist now passes through the wire MC16-13(silver-plated copper) 0.05, cut lead-in track, contacts potentiometer raised and do not touch the board. Still have access to the line-out, installed protective resistors 50Om
  9.     removed the low quality resistors in the signal path to the headphonesAMP and line-out
  10.     increased power amplifier to your ear +-4V
  11.     filtering power before and after the dc-dc TD1410 (power supply for headphonesAMP)
  12.     opamp LPF LM4562
  13.    headphonesAMP made of LM4562+THS4222 - output up to 100mA per channel, 14mA quiescent current per channel(most portable headphones will work in Class A)
  14.     power cap for headphonesAMP is 2x220uF Panasonic FK, LPF 2x47uF Panasonic SU(bipolar capacitors with very low distortion)
  15.     measuring resonator 24MHz, the structure in tact CPU PLL, a generator with low jitter
  16.     stock replacement batteries for the assembly of two LP473850 1090mAh, setting equalizer to equalize pressures between the banks
  17.     sealed cables and sensor module aluminum tape to avoid interference on the part of the signal
 

 

Do you accept Paypal ?

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