OLD THREAD DAC End by Andrea Ciuffoli

[Tea-Bag]

I think I am over project'd right now and would like to sell my boards if someone is interested.
I have the 4 boards, plus the Analog 1865N-K chip from Mikel-Ann's GB. Additionally I have a few caps for the salas board to throw in.
I am looking for a decent offer on this. PM if interested.

My set is sold! Thanks

 

[adamus]

I did the 'filterectomy' this morning. Removed the inudctors, and the 2k's from the IV stage. I left the caps (10nf so about 80khz ).

It lets the whole sound breath a little more. No harshness is introduced, just a little more air and ambience. I can see why audionote ditched the filter.


My advice is for people to try filterless (it took me 3 mins), and for new builders to consider not having the filter.

 

[housing]

I did the 'filterectomy' this morning. Removed the inudctors, and the 2k's from the IV stage. I left the caps (10nf so about 80khz ).

It lets the whole sound breath a little more. No harshness is introduced, just a little more air and ambience. I can see why audionote ditched the filter.


My advice is for people to try filterless (it took me 3 mins), and for new builders to consider not having the filter.

A jumper shorting the inductors?

 

[audiodesign]

This DAC integrated in my cheap system 3

Cheap hi-end system

 

[adamus]

A jumper shorting the inductors?

yes, just jumpered them out.

 

[housing]

yes, just jumpered them out.

Hi Adam,

Thanks.

BTW, have you got your AD1865N-K from the group buy?

housing

 

[adamus]

not yet... but customs have been so slow recently. I had to wait 35 days for an ebay purchase!

I have another ad1865nk though so no probs.

 

[housing]

35 days!

 

[flocchini]

I did the 'filterectomy' this morning. Removed the inudctors, and the 2k's from the IV stage. I left the caps (10nf so about 80khz ).

It lets the whole sound breath a little more. No harshness is introduced, just a little more air and ambience. I can see why audionote ditched the filter.


My advice is for people to try filterless (it took me 3 mins), and for new builders to consider not having the filter.

Adam

Completely agree. The filter is out andwon't be going back.
I am also leaving the Welborne HV supply. Works really well.

 

[adamus]

are you also LED bias?

 

[flocchini]

Yes I am using the LED bias.

 

[mikelm]

Hi quanghao, just to say I got my boards today.

They look great - many thanks for all of ur efforts

mike

 

[quanghao]

Hi quanghao, just to say I got my boards today.

They look great - many thanks for all of ur efforts

mike

thank!

 

[pathetic]

Could anyone provide an estimate cost of this dac (just the 4 boards fully populated without the transformer and case). Thanks.

 

[GIPIONE]

*A. COST OF One SET *4PCB* :*

yes! i have somer PCb :
DAC, Salas shunt for DFAC, Iv stage
Thank

*A. COST OF One SET *4PCB* :*
1. PCB- DAC END use AD1865
2. PCB- Salas Shunt For DAC
3. PCB- I/V stage use tube E182CC or 5687
4. PCB- Supply for I/V
The price:
Board set (of 4):
Shipping from Vietnam: US$ 6 (surface mail)
Payment fee (PayPal) at 3.5%: US$
TOTAL: US$ 60
/*A donation of $2 USD to diyAudio will be done for Board set (of 4)*/
Please feel free to make your inquiries or request of information to my email address quanghao168@yahoo.com.vn <mailto:quanghao168@yahoo.com.vn>
Thank you.

have you a set?
how cost with expedition in ITALY? ( PAYPAL)

regads
gipione


*F-----------o*

*v-----------7*

*31100 TREVISO (TV)*

*ITALY*

 

[Salas]

Please use email or personal message to the interested member and don't post your personal address and name on the web. Its dangerous. I have edited that out.

 

[housing]

Keep attention to the output capacitor value.


Cout (uF) Rload (ohm) Ft(-3dB)
1.00 10000 15.92
1.00 50000 3.18
10.00 10000 1.59
4.70 10000 3.39
0.47 50000 6.78

Hello Andrea,

What value of the output capacitor and Rload are you using? What's the minimum voltage of the output capacitor? Is 200V OK?

Regarding the jumper on the DAC board, is it correct to hard wire pin 1 & 3 and leave pin 2 untouched?

Thanks for your response in advance.

housing

 

[adamus]

You need to know the input impedance of the next stage.

My dac goes to a 10k pot and has a 2.2uf cap so Ft (-3db) = 7 hz, which some would say is a little high, it first order so will gentle roll off, an may have an effect in the audible range (phase)

 

[audiodesign]

In my cheap system 3:

Cheap hi-end system

To reduce the distortion, to increase the output level and to load better the 10Kohm ALPS I have decided to use E182CC Mullard with the Kand Audio modules to implement a current generator instead of normal anodic resistors.

The result is good, probably a little bit less smoth but some more details.

 

[adamus]

i too have tried the css, more detail.... but slightly dryer presentation. In the end i have settled on resistor for the anode load, and led bias.... to my ears its the perfect combination. Probably not the lowest distortion or the least noise... but lovely realistic music.