AK4490 USB Dac with dsd support. - Page 15

sonnya · 4th June 2015, 09:52 PM

Quote:

Originally Posted by MisterRogers

If you can Sonny, give us a peek at the new shield you're working on :-)

I am going to make discrete opamp Sections that are semi symmetrical . Input will be LTP, second stage is an current mirror, followed by an buffer. This Way it will only have "single gain stage".

I could make it symmetrical but complexity will grow a lot.

But more will follow tomorrow morning

Sent from my iPhone using Tapatalk

MisterRogers · 4th June 2015, 10:10 PM

Thanks Sonny - looking forward to it.

vitalica · 5th June 2015, 05:51 AM

Quote:

Originally Posted by sonnya

Ok, now i am moving on to the discrete balanced output shield.

How many are interrested in this with my USB Audio DAC?

+1

sonnya · 5th June 2015, 07:17 AM

The attached opamp design is the one i will use for the discrete output shield.

As we only have 100mA i total to the outputstage we will have an maximum of 15 - 20mA per opamp to be on the safe side.

This opamp will rest at around 14mA.

I have chosen npn bjt in the input stage as the source impedance's are relatively low, and with bjt we will get a lower offset than with JFET which for 2sk2145-BL is around 20mV. For BJT we can get down to 1/10 of that. And because of the symmetrical loading of the opamp, there is no extra offset build up by the mismatch of source impedance's.

2 opamps will be used for balanced and 1 for balanced to singleended conversion on the output per channel.

BR

Sonny

sonnya · 5th June 2015, 09:52 PM

Just 2 shots from volumio on pi2 with the USB DAC

pinnocchio · 5th June 2015, 10:36 PM

Do we have to set volumio in DoP mode for DSD or use native mode?

Thanks
Do

sonnya · 5th June 2015, 10:45 PM

Yes at the moment it has to be DoP mode for DSD

Sent from my iPhone using Tapatalk

pinnocchio · 6th June 2015, 04:05 AM

Thanks Sonny!

This is also what I use, Pi 2 with volumio 1.55

Will start working on it soon. I'm at the Montreal Grand Prix this weekend so I put music on the side for a few days.

I will be using Sigma 22 and Sigma 11 from AMB for powering the DAC.

Ciao!
Do

sonnya · 7th June 2015, 07:50 PM

I have found a solution for changing filter. The frontpanel makes it possible. The USB DAC reads the selected filter from the front panel as well as sending the type of data stream that it receives.

We have have test an OLED display in december with 64x256 pixels.

This frontpanel has IR receiver. and will be the same used for the preamp.

We will make a brown colored Plexiglas front for it..

BR Sonny

rogerchou · 7th June 2015, 08:25 PM

Quote:

Originally Posted by sonnya

I have found a solution for changing filter. The frontpanel makes it possible. The USB DAC reads the selected filter from the front panel as well as sending the type of data stream that it receives.

We have have test an OLED display in december with 64x256 pixels.

This frontpanel has IR receiver. and will be the same used for the preamp.

We will make a brown colored Plexiglas front for it..

BR Sonny

Amazing, these ideas make us more convenient. Thanks a lot.
Please use codes for Apple remote.

5th June 2015, 10:36 PM	#146
pinnocchio diyAudio Member Join Date: Sep 2010 Location: Montreal	Do we have to set volumio in DoP mode for DSD or use native mode? Thanks Do __________________ PREAMPs : AMB α10 + USSPA \| LDR3x + USSPA \| AMPs: AMB β24 \| USSA5 \| FSSA2 \| MoFo \| FC-100 \| Modulus-686 \| SimpelStark+ \| DACs : Mirand AK4490 + Discrete Output \| Speakers : Troels Gravesen ATS-4 \| Sagwee LT V3 \|

5th June 2015, 10:45 PM	#147
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	Yes at the moment it has to be DoP mode for DSD Sent from my iPhone using Tapatalk __________________ Mirand Audio amps and Dac's - mirand-audio.dk

6th June 2015, 04:05 AM	#148
pinnocchio diyAudio Member Join Date: Sep 2010 Location: Montreal	Thanks Sonny! This is also what I use, Pi 2 with volumio 1.55 Will start working on it soon. I'm at the Montreal Grand Prix this weekend so I put music on the side for a few days. I will be using Sigma 22 and Sigma 11 from AMB for powering the DAC. Ciao! Do __________________ PREAMPs : AMB α10 + USSPA \| LDR3x + USSPA \| AMPs: AMB β24 \| USSA5 \| FSSA2 \| MoFo \| FC-100 \| Modulus-686 \| SimpelStark+ \| DACs : Mirand AK4490 + Discrete Output \| Speakers : Troels Gravesen ATS-4 \| Sagwee LT V3 \|

7th June 2015, 07:50 PM	#149
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	I have found a solution for changing filter. The frontpanel makes it possible. The USB DAC reads the selected filter from the front panel as well as sending the type of data stream that it receives. We have have test an OLED display in december with 64x256 pixels. This frontpanel has IR receiver. and will be the same used for the preamp. We will make a brown colored Plexiglas front for it.. BR Sonny __________________ Mirand Audio amps and Dac's - mirand-audio.dk

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
CS8416+CS4398 DAC Kit Support USB + coaxial DAC Board	bleachershane	Digital Line Level	4	2nd February 2015 10:45 PM
GUSTARD DAC-X10 DAC ES901 (Support DSD)	MRswitch	Digital Source	29	23rd November 2014 01:13 PM
ES9018 DAC -AD79-XMOS DSD usb	Bobekt	Digital Source	0	17th August 2014 09:42 PM
USB DSD DAC and ADC by ElectrArt	alexcount	Digital Source	70	15th May 2014 01:30 PM
SD Card Player/DAC/Amplifier QA860, DSD support with AD1955	lxiaob	Digital Source	2	9th September 2013 06:55 PM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

4th June 2015, 10:10 PM	#142
MisterRogers diyAudio Member Join Date: Aug 2011 Location: Aurora, Colorado	Thanks Sonny - looking forward to it.

New To Site?	Need Help?
Register to Participate Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read