OLD THREAD DAC End by Andrea Ciuffoli

[dvb projekt]

If you want use the DAC board without the Salas power supply regulators you can use a normal series regulators like the LM317 and LM337 to generate 5.0-5.5v.

Thanks for the information. BTW, is there a specific reason to use smaller caps near by the IC´s on the DAC-Board (220µF input/47µF at Vin´s)?

 

[audiodesign]

I don't like led bias but if you want test it Quangha will try soon to add a little change in the pcb to support it like option.

 

[audiodesign]

dvb-projekt, what you mean ?

Quangha have uesed 220uF + 0.1uF on DAC power supply input and 47uF + 0.1uF near the chip pin.

 

[dvb projekt]

That´s what i mean. If you have a look on my DAC in the Galery, there are 220µF arround the TDA1541A chip. Is it equal to use 47µF to 220µF as on my DAC board?

 

[Ekkeri]

Paypal sent. Would it be possible to have BOMs in text format for easier copy&paste? How final those are? Package info would also be nice for parts that have different packages available or components that can be replaced by something else (like capacitor sizes, there seems to be some tight spaces). Thanks!

 

[audiodesign]

dvb-projekt, yes

 

[Tea-Bag]

payment Unique Transaction DAC-END up dat

Quanghao,
I paid for full set, not two salas shunt, please confirm.

 

[giabast]

payment sent,

giabast

 

[fastvideo]

quanghao,
you got pm, let me know thanks.

 

[quanghao]

payment sent,

giabast

YES! That BOm
http://spreadsheets.google.com/ccc?key=0AurB34WilwN6dEpjZlBiT2dRajRiQS1NN2pGTjJveVE&hl=en

 

[fastvideo]

How much i should send if I take

1X Full set
1X PCB- I/V stage use tube E182CC or 5687
1X PCB- Supply for I/V
Let me know the total.
Thank you.

 

[fredlock]

Power Supply for I/V

Hi audiodesign,

The power supply for I/V was designed for 240VAC input. Could you also post a circuit diagram or maybe parts changes for 120VAC?

Thanks for your sharing this DAC project to us.

Fred

 

[adamus]

same schematic, just different ac transformer.

 

[fredlock]

Thanks Adamus. Now I just realized that the the other half of the transformer was a stepped up, from 220VAc to 250VAC secondary. Anybody here in the US know where to buy this transformer with 120VAC input with 250VAC/50mA secondary? or any other alternative?

Thanks,
Fred

 

[dubai2000]

Two full sets, please. Money has already been sent.
BTW: As I live close to Jogi and I also prefer air mail my order can be shipped with his. Otherwise please conact me for my address. Thx.

 

[dubai2000]

1. MarkLai : 2x DAC sets: DAC + Salas Shunt power for DAC
2. Jeffrey Davison : full set
3. TjongKristian : full set
4. gillib : full set
5. sugden : full set
6. toufu : 2 full sets
7. Yunick : full set
8. Michael : full set
9. COX77 : full set
10. Yunick : full set
11. jleaman : ?
12. fredlock : full set
13. Cobra2 : full set
14. tassosk: full set
15. pdcaceo:full set of PCB
16. pop music : 2 full set
17. Erwincantona : full set
18. numerik
19. Tea-Bag : full set
20. giabast : full set
21. Blitz : full set
22. Duc Tran: full set
23. agithegreat: full set - Paid
24. jims : full set
25. khaho : full set
26. ernesternest: full set
27. dvb-projekt: full set
28. quanghao: full set
29. Audiodesign: full set
30. frd__: 2 full sets
31. Ekkeri: full set
32. prooptiki: full set
33. NICKEL I/V Stage and Supply Boards only
34. Adamus: full set
35: Sai Lee: full set
36. rolotube: full set
37: dubai2000: 2 full sets

 

[audiodesign]

Published the last measurement on DAC output filters on the prototype board.

DAC End 2 - the AD1865N-K with single ended vacuum output stage

I consider as best solution a 10-12nF in parallel to the 200ohm I/V converter
but the pcb will allow you to use a different type of filter.

 

[audiodesign]

The transformer specification are about this:

3 x 12v 1A

1 x 9v 3A

1 x 250v 0.2A

I have sent my choice about these transformers got on eBay shop.

 

[Ekkeri]

The transformer specification are about this:

3 x 12v 1A

1 x 9v 3A

1 x 250v 0.2A

I have sent my choice about these transformers got on eBay shop.

Is there any 250VAC & 9VAC transformer for 230VAC to be found? 250V & 6.3V was the closest I found. There is 250V/50mA in the schematic, is 0.2A really needed?

How about using 6.3AC for the heaters? Have you tested the hum? Or do you have that I/V?

And any 3x12V? 2x12V & 1x12V was again the closest..

 

[quanghao]

The BOOM

http://spreadsheets.google.com/ccc?key=0AurB34WilwN6dF9jX1B6WkYyTFQxUW5xaXlUdjB4c2c&hl=en