OLD THREAD DAC End by Andrea Ciuffoli

[GIPIONE]

I'd like to change mine to a full set, so:

1. pathetic (1 set)
2. cchean ( 2 sets )
3. Lucylu (1 set)
4. Ulyses31 (1 set)
5. damohpi (1 set)
6. mikvous (3 sets)
7. gipione ( 1 set)
Thanks Quanchao

 

[Salas]

And design the PCB such that it can also use the IRF610 and 9610 instead of the bigger IRFP's.

IRF540 and 9540 for TO220. Don't redesign off hand, those you mentioned will oscillate.
Also don't bypass the 47uF caps on the various chip feeds with 0.1uF films. ESR is needed there if those caps will be used as the integrated shunt regs output caps in the new no TL431 version, else the loop margin shortens too much and the step response roughens also.

 

[vzs]

IRF540 and 9540 for TO220. Don't redesign off hand, those you mentioned will oscillate.
Also don't bypass the 47uF caps on the various chip feeds with 0.1uF films. ESR is needed there if those caps will be used as the integrated shunt regs output caps in the new no TL431 version, else the loop margin shortens too much and the step response roughens also.

I started to assemble the DAC board and I'm a bit puzzled. I decided not to use chip regs for the +-5V analog part but use them for better isolation between various digital parts.
Do you suggest not to use the 0.1uF decoupling caps which are in parallel with the 47uF? Or did I misunderstand smtg

 

[housing]

IRF540 and 9540 for TO220. Don't redesign off hand, those you mentioned will oscillate.
Also don't bypass the 47uF caps on the various chip feeds with 0.1uF films. ESR is needed there if those caps will be used as the integrated shunt regs output caps in the new no TL431 version, else the loop margin shortens too much and the step response roughens also.

Thanks Salas. TO220 is good.

 

[Salas]

I started to assemble the DAC board and I'm a bit puzzled. I decided not to use chip regs for the +-5V analog part but use them for better isolation between various digital parts.
Do you suggest not to use the 0.1uF decoupling caps which are in parallel with the 47uF? Or did I misunderstand smtg

I was talking the new design for integrating the regs right next to the DAC chips I read about.

In your case, if you will skip the 431s in some place, there is distance from the output capacitor of the reg to the local on the DAC. The 0.1uF may be counteracting the inductance of the traces length better. Just check subjectively with and without if you have no oscilloscope.

 

[belkoff]

8.belkoff.
Thanks.

 

[housing]

PM: And I use Salas Shunt HV for IV, the sound is excellent,
One test with 6h30pI or 6h6, I show the sound is very very natural. sound more realistic and very detailed. I think it fits the sound quality of the AD 1865. I can say I love 6h30.
Best regard!
Thank you!

Quanghao

Hi quanghao,

Is 6h30pi a direct replacement of 5687 or it needs some modification to the circuit? Thanks.

 

[flocchini]

1. pathetic (1 set)
2. cchean ( 2 sets )
3. Lucylu (1 set)
4. Ulyses31 (1 set)
5. damohpi (1 set)
6. mikvous (3 sets)
7. gipione ( 1 set)
8. flocchini (1 6h6P if done, 1 Salas HV)

Thanks

 

[quanghao]

Hi quanghao,

Is 6h30pi a direct replacement of 5687 or it needs some modification to the circuit? Thanks.

No change direct it! you can use convert pin , form 5687 to 6h30
This is cricuit, Can use 6dj8 or 6h6, 6h30...

 

[adamus]

its not pin for pin. You could easily breadboard a more typical 9pin tube layout. I think quanghao would sell a few pcbs too if he designed for the 6n6p

 

[vzs]

DAC board only for sale

Due to some changes/priorities I want to sell the DAC board only from this project with few parts (chip regs + caps):

1 x DAC board, 7 x TL431, 7 x Elna Silmic II 220uF, 6 x Oscon 47uf, 21 x Res (around input regs), 7 x Wima MKS2 220nf (at the input), 6 x Wima MKP2 100nf (decoupling)

I ask the price I paid for them: 31euro + shipping/payment charges depending where you are.

PM if you are interested.

Thanks,
Zsolt

 

[GIPIONE]

paying with paypal, shipping in Italy how much cost all.........comprise.?

thank gipione

 

[klaju1955]

Due to some changes/priorities I want to sell the DAC board only from this project with few parts (chip regs + caps):

1 x DAC board, 7 x TL431, 7 x Elna Silmic II 220uF, 6 x Oscon 47uf, 21 x Res (around input regs), 7 x Wima MKS2 220nf (at the input), 6 x Wima MKP2 100nf (decoupling)

I ask the price I paid for them: 31euro + shipping/payment charges depending where you are.

PM if you are interested.

Thanks,
Zsolt

Hi,

it´s the newer version of DAC board?

regards

 

[vzs]

Hi,
it´s the newer version of DAC board?
regards

It's the original version which was completed by many.

 

[belkoff]

1. pathetic (1 set)
2. cchean ( 2 sets )
3. Lucylu (1 set)
4. Ulyses31 (1 set)
5. damohpi (1 set)
6. mikvous (3 sets)
7. gipione ( 1 set)
8. flocchini (1 6h6P if done, 1 Salas HV)
9. belkoff (full set dac end 2 + 1 6h6P if done, 1 Salas HV) + schematic for each PCB

 

[housing]

That's what I thought too, but I'm still getting 280Vac even with the load.

I finally fixed the problem with the LED not turning off when plug in to a CD. It was a cold solder on the CS8414 pins. I retouch the soldering and now I'm listening to music. Very cool! very nice Dac. I like the sound, as what everybody says. The only disadvantage is, it's HOT. My next plan is to incorporate a USB to SPDIF converter board so I can connect it to my laptop or desktop computer.

How about you Housing, is your Dac done?

Hi Fredlock,

Not yet. But the DAC, LV and HV shunt supply portions have been checked working in order.

This is the picture of my project completed so far. Just bought a chassis and it just fits.

 

[Salas]

Smells like this one will sound nice. Is that a Riken for Vref? Not best choice is carbon. Enough ppm and self noise. Or is it a gate stopper?

 

[housing]

Smells like this one will sound nice. Is that a Riken for Vref? Not best choice carbon. Enough ppm and self noise. Or is it a gate stopper?

Thanks Salas.

The 2W Riken is only used in the CCS, as circled in blue in the new photo. Is this OK or should I change it, for say, some Holco 1W in parallel?

The Vref resistors are circled in orange, 2 Vishay s104K 200K and 2 s102k 70K in parallel/series, with a resultant resistance of 135K. The temperature coefficient is only 5 ppm if I remember correctly.

 

[Salas]

The Vishays are an excellent choice in Vref. What the Riken does? Is it from LEDS to ground? Or is it a gate stopper? Or Iset?

 

[housing]

The Vishays are an excellent choice in Vref. What the Riken does? Is it from LEDS to ground? Or is it a gate stopper? Or Iset?

Iset=33R, old used part in the bin box.