Buffalo DAC (ESS Sabre 9008)

[glt]

Re: Some VREF fun...

Ok for you die hard tweakers out there. I will throw you a bone. 🙂

Here is one mod which I know will pay dividends.

...

Now you have a sub 100nv (I will have to measure it later but I know its quite low) noise voltage reference that is not connected to the digital supply in any way.

You still have the excellent PSRR of the LM4562 and milliohm output impedance.

...

Cheers!
Russ

Thanks Russ. Makes a lot of sense! Noise level from 30uV to 100nV 50db lower...

 

[Russ White]

Now if you really want to go crazy replace R1 in the VREF schematic with a 3-5ma CCS. 🙂

 

[glt]

In due time. I'm still enjoying the OPUS 8741. The Buffalo is still in the box 🙂.

 

[BrianDonegan]

Much requested, now available...

Low-current Power Supply BOM (Bipolar and Dual)...

 

[eaoyama]

Now if you really want to go crazy replace R1 in the VREF schematic with a 3-5ma CCS. 🙂

you mean the 120R?

 

[eaoyama]

Tks again, for your aswers.

Next year, lol, i'll try a new PSU to IVY, but using the orginal LCBPSU, and adding more comercial regulators in serie, i'll try use LM317 and 337.

[]s

 

[LTK]

you mean the 120R?

I think he means the 1k feeding the series leds

 

[eaoyama]

I think he means the 1k feeding the series leds

Ops my bad!!!

 

[LTK]

BTW, nice little circuit Russ, thanks for sharing

Even the type of regulation to the LM4562 pin8 +v makes a audible difference so the little circuit above for the AVCC is certainly worth trying

 

[glt]

Now if you really want to go crazy replace R1 in the VREF schematic with a 3-5ma CCS. 🙂

The simplest ccs is an n-channle jfet with Vgs=0. Would this be a suitable part http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=J112FS-ND?

Thanks.

 

[Russ White]

BTW, nice little circuit Russ, thanks for sharing

Oh your welcome. 🙂

I figure some of you might want something to do over the holidays. 🙂

 

[glt]

The simplest ccs is an n-channle jfet with Vgs=0. Would this be a suitable part http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=J112FS-ND?

Thanks.

Correct link: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=J112FS-ND

 

[Joshua_G]

The simplest ccs is an n-channle jfet with Vgs=0. Would this be a suitable part http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=J112FS-ND?

Thanks.

I believe 2SK117 GR or 2SK170 GR will do:
http://www.ampslab.com/components_fets.htm
http://www.bdent.com/search/search.jsp?contains=2SK170&category=ALL&submit.search=Search!

 

[avr300]

Just to show I actually tried it and it works (and sounds really nice)...

Thanks Russ.

One more here. Done with 2SK170-GR as ccs.

Don't ask yet. I don't even know if it's working or not.

 

[Russ White]

Thanks Russ.

One more here. Done with 2SK170-GR as ccs.

Don't ask yet. I don't even know if it's working or not.

Looks good! 🙂

 

[Bgt]

Brian, Russ, how to connect the optical Spdiff module to the 8416MUX pcb?
Do I have to use the AES channel or can I just connect it to 1 of the other inputs but without the input transformer + 75ohm resistor?


PS Thanx for the kits

 

[BrianDonegan]

Just connect it to any of the inputs, no changes needed. They will all tolerate the 3.3V swing.

 

[Bgt]

Brian, can you ommit the transformer and connect it directly?

 

[BrianDonegan]

If you want to, but I see no advantage in doing so.

 

[Russ White]

Thanks Russ.

One more here. Done with 2SK170-GR as ccs.

Don't ask yet. I don't even know if it's working or not.

Ok, so is it working ok for you? 🙂