OLD THREAD DAC End by Andrea Ciuffoli

[quanghao]

quick question regarding the inductors (120uf) From farnell i can only find a choke with self resonant frequency of 10khz.

What do you say about???

could i jumper the choke, the RC filter remains.

No, you can not use choke for Jumper.

 

[adamus]

other way round, can i not use the choke by jumpering the choke space on the PCB.

Sorry quanghao - i think the language barrier is confusing us.

Cheers

 

[quanghao]

other way round, can i not use the choke by jumpering the choke space on the PCB.

Sorry quanghao - i think the language barrier is confusing us.

Cheers

Ok! can you show me??? and what do you want ask me about the DAC-end??

thank you!

 

[adamus]

i cannot find a suitable choke, so what would be the effect of not using one (replacing it with wire).

Thats all i want to know really. OR could i use the chokes with 10khz self resonsant frequency.

 

[quanghao]

i cannot find a suitable choke, so what would be the effect of not using one (replacing it with wire).

Thats all i want to know really. OR could i use the chokes with 10khz self resonsant frequency.

where do you want use choke?? I board dac at output , after R 200 Ohm
Or near TL431???

 

[adamus]

the choke after the 200r, i dont want to use it.

 

[audiodesign]

See these other models :

Inductors, Chokes & Coils | Farnell United Kingdom

with higher self resonsance frequency

 

[adamus]

I thought they my work, trouble is is £16 for delivery.... ouch!.

Edit - found some on Ebay.

Any Uk'ers in need drop me a pm.

 

[vernon.taylor]

Boards arrived a couple of days ago - look good.

Thanks.

Vernon

 

[Ekkeri]

the choke after the 200r, i dont want to use it.

Is there even places in the PCB for those? I can see 120uH (L1&L2) in "The Original Circuit" but not in the pcb layout for this project?

EDIT: Ok, now I see.. This isn't the final version I guess.. And BOM doesn't have those either?

 

[quanghao]

Is there even places in the PCB for those? I can see 120uH (L1&L2) in "The Original Circuit" but not in the pcb layout for this project?


no! That is not Original layout,

You can not use L1, L2, C26, C27 if you dont like it, so In the Board IV stage, do not use R30-R33 ( 4 x 2K//).

 

[sugden]

I think the actual schematics and PCBs Layout used by quanghao to make PCBs is at post #297 to post#300.

 

[flocchini]

Inductors,caps

See also post 376, 377 and 495

 

[quanghao]

I was Donate to diyaudio.com 80$ for 40 set total group!
Thank you all!
Quanghao

 

[fredlock]

Anybody in the US received their boards yet? Just wondering since most of the guys in Europe already got their boards. 😕

 

[Agi]

Anybody in the US received their boards yet? Just wondering since most of the guys in Europe already got their boards. 😕

Still waiting here (i'm in the US btw).

 

[Ekkeri]

It would have been nice if those schematics & layout pics had some kind of version number.. Wouldn't been this confusing. More final BOM would also be nice. 😱

What type of specs the L1 & L1 120µH should have? Current, tolerance, resistance, core, shielding..? Any recommentations what manufacturer / part number to use? Those are in pretty critical place in the signal path..

 

[flocchini]

Boards

Anybody in the US received their boards yet? Just wondering since most of the guys in Europe already got their boards. 😕

Waiting

 

[Jeffrey Davison]

waiting, tho I did get an email confirmation with the tracking number.

JD

Anybody in the US received their boards yet? Just wondering since most of the guys in Europe already got their boards. 😕

 

[quanghao]

we have two weeks to catch Tet
Happy new year!