Anybody using the new ESS Vout DAC (ES9022)? - Page 34

Joachim Gerhard · 6th February 2012, 04:15 PM

Good, we have the link now. In fact my filter can be redesigned for 3rd order too if so desired without much effort.

free2dev · 6th February 2012, 10:40 PM

I built Joachim Gerhard buffer / filter over the weekend and listened to it for few hours on Sunday. Sounds good and I like it. Will play around with it for some more time. I used the Fastron Inductor from mouser.com.

Thanks!
free2dev

Joachim Gerhard · 6th February 2012, 11:36 PM

Thanks, that is good new, so the Fastron works. What happens if you jumper it ?
I made some simulation on a 3rd order filter but i can not make it phase linear without drop in the treble with the default 4,7nF cap. I like the second order better anyway. I really listened careful so that it does not take too much sparkle and air away.

free2dev · 7th February 2012, 01:36 AM

Hi Joachim, I haven't tried it. I will jumper it when I get home and see how it sounds.

-free2dev

Joachim Gerhard · 7th February 2012, 02:22 AM

Fine, i am curious.

EUVL · 7th February 2012, 02:58 AM

We are still waiting for delivery from Mouser.

Joachim, no problem changing the 4.7n cap if necessary.

Patrick

Joachim Gerhard · 7th February 2012, 06:01 AM

I made some simulations and the price of the 3rd oder filter is more latency or an undershot of the impulse response so i stick with the second order filter. What could be tried is to lover the "ballast" resistor before the buffer and then we could use a lower inductance coil with potentially higher self resonance but then we load the DA converter more and that gives more distortion. I really do not want to go under 10kOhm or the buffer makes not much sense. I think my solution is as good as it gets, all considered.

EUVL · 7th February 2012, 03:57 PM

Our PCB just arrived.

As you can see, it accommodates up to 4 JFETs in a cluster per channel.
And the layout is nearly fully symmetrical.

Matching and building during the weekend, then we shall send to Joachim for audition.

Patrick

Joachim Gerhard · 7th February 2012, 04:15 PM

Wow, that was fast. Looks very good. I will listen to it carefully.
I just made some improvements to my system that have to do with more precise and transparent volume control plus new speaker placement, so i am in a better position now.

EUVL · 24th February 2012, 10:39 AM

I was requested by PM to give an update for the Joachim gerhard buffer.

We have the PCBs as you can see. We matched the BF862's.
But before we could match the J111, the team member involved has a family emergency.
That has taken him out of hobbies for the past 2.5 weeks.

As you would all appreciate, work and family come first for us.
I cannot give you a date as to when that situation would be relieved, such is its nature.

So I can only ask for your patience in the meantime.

Patrick

7th February 2012, 02:58 AM	#336
EUVL diyAudio Member Join Date: Oct 2003	We are still waiting for delivery from Mouser. Joachim, no problem changing the 4.7n cap if necessary. Patrick __________________ xen-audio.com

24th February 2012, 10:39 AM	#340
EUVL diyAudio Member Join Date: Oct 2003	I was requested by PM to give an update for the Joachim gerhard buffer. We have the PCBs as you can see. We matched the BF862's. But before we could match the J111, the team member involved has a family emergency. That has taken him out of hobbies for the past 2.5 weeks. As you would all appreciate, work and family come first for us. I cannot give you a date as to when that situation would be relieved, such is its nature. So I can only ask for your patience in the meantime. Patrick __________________ xen-audio.com

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6th February 2012, 04:15 PM	#331
Joachim Gerhard diyAudio Member Join Date: Mar 2009	Good, we have the link now. In fact my filter can be redesigned for 3rd order too if so desired without much effort.

6th February 2012, 10:40 PM	#332
free2dev diyAudio Member Join Date: Mar 2010	I built Joachim Gerhard buffer / filter over the weekend and listened to it for few hours on Sunday. Sounds good and I like it. Will play around with it for some more time. I used the Fastron Inductor from mouser.com. Thanks! free2dev

6th February 2012, 11:36 PM	#333
Joachim Gerhard diyAudio Member Join Date: Mar 2009	Thanks, that is good new, so the Fastron works. What happens if you jumper it ? I made some simulation on a 3rd order filter but i can not make it phase linear without drop in the treble with the default 4,7nF cap. I like the second order better anyway. I really listened careful so that it does not take too much sparkle and air away.

7th February 2012, 01:36 AM	#334
free2dev diyAudio Member Join Date: Mar 2010	Hi Joachim, I haven't tried it. I will jumper it when I get home and see how it sounds. -free2dev

7th February 2012, 02:22 AM	#335
Joachim Gerhard diyAudio Member Join Date: Mar 2009	Fine, i am curious.

7th February 2012, 06:01 AM	#337
Joachim Gerhard diyAudio Member Join Date: Mar 2009	I made some simulations and the price of the 3rd oder filter is more latency or an undershot of the impulse response so i stick with the second order filter. What could be tried is to lover the "ballast" resistor before the buffer and then we could use a lower inductance coil with potentially higher self resonance but then we load the DA converter more and that gives more distortion. I really do not want to go under 10kOhm or the buffer makes not much sense. I think my solution is as good as it gets, all considered.

7th February 2012, 04:15 PM	#339
Joachim Gerhard diyAudio Member Join Date: Mar 2009	Wow, that was fast. Looks very good. I will listen to it carefully. I just made some improvements to my system that have to do with more precise and transparent volume control plus new speaker placement, so i am in a better position now.

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