AD1865N-K nos DIY

[philbyx]

Some photos :

Psu :


Guido clock, glue logic and old CD "oscillator"


The CD mod (see the coax from the clock):


The Dac "mother board":
from left to right :
transformer, cs8414, clock card, 2x ad1865


The box (thanks to 3com )


From the top (without the cd drive)


The D1 U/I converter (one chanel)


To be continued...

Philippe

[quantran]

AD1865 NOS DAC completed

Hi all

I have completed an AD1865 NOS DAC. Picture below. This looks ugly compared to the DAC done by Xiaolong, for sure due to point to point wiring.

Brief on the design:

Generally based on the schematic on ptsoundlab
Separate power supplies for digital and analog sections. Power transformers are also separate. Regulators are 78xx and 79xx, one for each power pin.
I/V stage: one opa627 on each channel using the AD1865 built-in feedback resistors (not the built-in opamp). No filtering at all.
Bypass caps: WIMA MKS 0.1uF for AD1865. WIMA MKS 1uF for opa627. One more 0.33uF orange drop cap on top of opa627 (add in later, not in the picture).
Output coupling cap: 3x0.47uF Philips MKP X2 (add in later, not in the picture). These are not very good, I suspect. I have also tried Solen, Sprague PIO and dit not like the sound.

The DAC sounds very detail but not as musical as I expected.

I have also tried to parallel the bypass caps with 4.7uF ELNA Duorex II cap. This made the bass very heavy and slow down so I removed them.

Anyone have recommendation to improve it? Thanks in advance.

[xiaolong]

MY PCB

[quantran]

Hi Xiaolong

Your PCB looks great. Do you sell it? Price? What parts do you use? It is very difficult to get some good parts from my place.

[xiaolong]

The PCB work welled yesterday of.
Pack the etc. it
Experimenting the examination it is good the hereafter just sell it.
Can go to my website to go to and see:http://www.audio-sz.com
My English is very stupid.

[quantran]

Xiaolong

Your site is in Chinese which I cannot read.

[xiaolong]

That have no way.I still want to do the diagraph to this PCB.
:ollar the edition for piece with DIY use just about

[motzu']

Help & Advice please

Someone still holds the schematics proposed by Kuei Yanq Wanq on the 2'nd page of this thread regarding a tube buffer for TDA 1545 diyparadise kit - also known as 'Monica'?

Could you re-post them please .


Thanks a lot

[dsavitsk]

You can use the WayBack Machine at archive.org to find things like this



link: http://web.archive.org/web/200411091...cc881canal.jpg

[motzu']

THANKS !

1'st for the schematic
2'nd for the hint

Never knew about that !

Wow - we're indexed and archived at every f...... step