Perfect Grade AD1955 Ver. 2.0 + CD-PRO2

WADIA VS AD1955 Pro KK's version show.

Sound tunning by KK, Avwalkman Small Chan.

Coming at Mid-July

SRC with USB to IIS daugther board.

No jumping wiring... Fully plug and play.

Remove R207-210, C216(no use), R215-8

Input 1: SPDIF (no change)
Input 2: XLR/Optical (no change)
Input 3: IIS --> when USB plug in, USB stream, no USB plug in, IIS input for CD-PRO2.

Please contact admin@hififever.com for DAC and upsampling board.

Couse A
AD1955 Deluxe edition (all BG cap + special components such as 0.0005% resistor, 1ppm temp stable resistor)
Up-sampling module inside (force to 24bits, 192KHz)
Build in USB in (USB to IIS in) same function on upsample module.
SD card & USB in (WAV file to IIS)
8mm base unit alum case. Anti vibration than a normal alum case.

Coming at July. Max 5 people / class. 4 lesson. Open a each SAT and SUN.
4 SAT pipeline and 4 Sun pipeline.

Course B
Super CD-PRO2 + AD1955 Upsampling + USB decode at same case.
A fully new design case (15mm base alum !!!)

For Course A and B, suggest you start to collect money now.......

See u in the demo show soon.

THX.

Finish the optimized material list.

Which one is FAKE ?

9.9N,

You can keep exisitng chassics (for install DAC and CDPRO2)

DAC PCB will be place at bottom level, on top is a 3mm alum which for CD-PRO2 base.

The allowable dimension is very limit. But can fit in.

Also, you can use IIS out from CD-PRO2 to fit into upsampling rate module then to AD1955DAC. ALL are using IIS transmission.
(not SPDIF --> DIR --> SRC --> Re-pack to SPDIF --> DAC)

THX

Dyna,

You can upgrade the "up sampling module"

It include USB and up sampling IC inside, same board. No jumping wire.

Special price only for Dyna.

THX.

VERY EXPENSIVE

Chassics:

Full alum finish.
Pre opening holes for WBT socket, XLR socket, USB, Optical input, S/PDIF Coaxial & XLR.
Empty Chassics ---> 12KG

No copper stand for PCB, the PCB is direct mount into the BASE unit.
Therefore, we choose 14mm alum.
Extreme anti-vibration.

Large LCD display

最快都要7月尾至砌好, 每天衹有一小時投入這工作, 星期六日 還好一些

現在進度如下:
Upsampling module PCB layout completed. (7月10號有板)
所有貴既電容己買(Full Blackgate capacitor, Black WIMA capacitor)
NS Op-amp LPF 己有

面板PCB (單面板layout 中)
MP3, AAC, WAV to IIS module layout 中
機箱八月中
最快九月中閞班,  不過..........
可以先砌 PCB先, 砌完個 25磅鋁箱就番
乜孔都吾駛鑕, 只用上screw


Plan A, B : Difference on the components
Plan C, D : Difference on the base unit
Plan E,F : Balance config VS Un-balance config.

If you don't have balance in preamp, suggest you make the un-balance one to save money and have better performance.

Common section:
SRC + USB module
New design front panel (can upgrade to AAC to IIS)
2 R-CORE (Analog and Digital)
6 button on front panel
Play, FB, FF, Source, SRC On/Off . Display On/Off
New concept Power button. (see the pic)



要砌既朋友儲定錢啦

要砌既朋友儲定錢啦  

[quote:124fa8c8f9="kk_ho"]要砌既朋友儲定錢啦

Please send email to ask admin about the price of Upgrade module(complete unit, only plug and play) for existing AD1955  [/quote]

焊好 Surface mount 零件, 未洗底板

清洗完

Complete unit, No jumping wire to mainboard
Default config is OS-Con Low ESR base capacitors

Connect with mainboard

IIS in(4), IIS out(4), Power(2), Source control(1)

Full Blackgate capacitors

Full WIMA Black 0.1uF

Will show the chasscis at next week, you will very very exciting.........

13mm BASE monster.
Direct injection
No copper stand.
Direct Grounding connection method. (Same as Denon and Yamaha flag ship model)

Detail calculation on I/V converter

Best in class value is
For 15V VCC
Pull up value = 1.2K
Resistor across opamp is 750R

For 12V VCC
Pull up value = 1.1K
Resistor across opamp is 1.5K

For using 1.21K and 820R will not have a best performance

Continue...........

Use a old "Yamaha DSP processor"($200 bought at MK 3 year ago. be a AD1955 case...

1ppm 24.576MHz 3.3V TCXO for Up-sampling clock

10ppm 12.000MHz 3.3V VCXO for USB bitstream DAC.

TCXO special circuit design by KK.Ho, please visit www.diyaudio.com for detail.

0.5% TL431 voltage reference.

Default kit is 1%, we use -40 to 125 military grade component.

Pay attention on the listening show, coming at end of Aug.

Machine 1,2 completed. 200 hour burn-in test start from 17-Aug to 29-Aug.

Machine 1: Very default components.
Default components, Dale resistor, NE5534 x 6, SRC on/off by module, Trodorial transformer x 1, 100KHz bandwidth LPF design for extened response on 192KHz module.

Machine 2: (Perfect Grade)
Full RMG resistor for analog stage, Analog power supply
0.5% TL431 shunt regulator
Full Rubycon black gate capacitor in analog stage
Full Sanyo OS-CON capacitor in Digital stage
Full Dale resistor (matched) for digital power supply.
TI OPAX27 for I/V conversion
NS LMHXXXX for LPF stage
Selected components for PLL stage in DIR9001.
ST-DV709 Digital input pulse transformer
Ultra precision (matched) silver mica capacitor for LPF stage.
Full WIMA (Black) 0.1uF decoupling capacitor for power supply
Ultra Low noise voltage reference 20uV for AD1955 2.8V (replace the poor sound of using default resistors 2.21K, 2.8K protential divider)
Seperate Analog and Digital R-CORE transformer.
Improved power supply for MCU power stage.
Extreme stable COG capacitor for MCU crystal stage.
SRC on/off by module

With CD-PRO2 together

CD-PRO2 (IIS) --> SRC board --> AD1955.

Completed, 200hour burn-in in progress.

During the burn-in (non stop) progress, I will take a short break before starting the "Ultimated Chassics" final process.....

Another difficult work...

Picture is :
CD-PRO2 IIS --> SRC (192KHz,24bits) --> IIS input to AD1955.

Ahwah,

This is CD-Pro2 with DAC combine product.

I have some order on hand now and complete 3 set to customer.

CDPRO2 + DAC + SRC + Full BG cap + Super (Crazy) chassics.

This project is focus to  "Complete" unit customer first and will not have "KIT version" at this moment.

Thanks for your enquirly.

The course may be at.............coming next year soon.

THX.

OK, you can use it (if the size is fit into the PCB)

THX

Sam Sam,

I've making the tailor made CD-Pro2 + DAC1955 + SRC + Super Alum case for pre-order customer.

(not from HK customer)


KK.

Adamcyc,

SRC 可獨立出售嗎 --> NO, only come with any DAC course.

還有SRC安在da1955內, 是否只
Support ISII input or both ISII and Conxial input?

IIS pass through to SRC module. The SRC process is IIS in and IIS out.

除非我對號入座, 我係吾散賣的, 何來天價

你仲要飛線, 電壓又吾係3.3V, TCXO又吾係3.3V.....

不對勿插

天價貨幣

New testing:

National Semiconductors LME49710 single opamp.

Use in Low pass filter stage.

Will arrange AB test for public soon.

http://www.national.com/pf/LM/LME49710.html#Overview

Datasheet here:
http://www.national.com/ds/LM/LME49710.pdf


天價 OPAMP