A supper dac & headphone amp with ES9038pro

[op111op]

DAC: ES9038pro

Input: S/PDIF,support PCM 44.1-192KHZ,and DSD64 via DOP

Output:Blance XLR to headphone ,or normal connect to headphone

Blance or normal connect to any other amp

Drive an output transformer to output Blance or normal

Output buffer: OPA1622*4

 

[op111op]

the amp has a TFT Display screen，and all of the Operation by remote control

 

[themystical]

That looks really interesting. What is the IV circuit? Are you using one half of the Opa1622 for the IV and the other half as a buffer? Where can you get the Opa1622 mounted on a DIP adapter?

 

[op111op]

That looks really interesting. What is the IV circuit? Are you using one half of the Opa1622 for the IV and the other half as a buffer? Where can you get the Opa1622 mounted on a DIP adapter?

No,i use the Voltage mode,So do not need IV conversion

And,i use dual NE5532AFE for LPF

I make the OPA1622 to DIP with a Conversion board

 

[themystical]

No,i use the Voltage mode,So do not need IV conversion

And,i use dual NE5532AFE for LPF

I make the OPA1622 to DIP with a Conversion board

I think the OPA1622 has a high enough output current and a low enough noise to be very suitable as IV op amp for the high out put current of the ES9038pro and that would improve the technical performance of your DAC. If you do try it out, please give us your feedback.
The problem with the OPA1622 for many DIYers is the package it comes in but the conversion board you have made goes some way to alleviate this problem. It would still be a difficult soldering job. Would it be possible to buy some of these conversion boards from you? Even better would be the Opa1622 pre-soldered.

 

[op111op]

I think the OPA1622 has a high enough output current and a low enough noise to be very suitable as IV op amp for the high out put current of the ES9038pro and that would improve the technical performance of your DAC. If you do try it out, please give us your feedback.
The problem with the OPA1622 for many DIYers is the package it comes in but the conversion board you have made goes some way to alleviate this problem. It would still be a difficult soldering job. Would it be possible to buy some of these conversion boards from you? Even better would be the Opa1622 pre-soldered.

I was originally intended to do as you said，but But gave up，Because the test of a variety of IV way, and now this method works best，sounds very good !

I'm glad to help you

 

[themystical]

I was originally intended to do as you said，but But gave up，Because the test of a variety of IV way, and now this method works best，sounds very good !

I'm glad to help you

Thats really interesting. Obviously the Vout is the easiest to implement with just some passive resistors/capacitors but in theory you cant achieve the 138dB DNR and the extremely low THD that the ES9038pro is theoretically capable of achieving with Iout. Are you saying that you have tried a number of IV circuits but the simpe Vout sounds the best? Can you please share your experience and subjective impressions?

 

[op111op]

Thats really interesting. Obviously the Vout is the easiest to implement with just some passive resistors/capacitors but in theory you cant achieve the 138dB DNR and the extremely low THD that the ES9038pro is theoretically capable of achieving with Iout. Are you saying that you have tried a number of IV circuits but the simpe Vout sounds the best? Can you please share your experience and subjective impressions?

The ES9038 has two output modes，you don't need any resistors/capacitors to do a IV

 

[themystical]

As you can see there is a DC offset AVCC/2 so may be you need a capacitor to remove that. Also it is good to load up the output to earth with say a 50k resistor?

 

[op111op]

As you can see there is a DC offset AVCC/2 so may be you need a capacitor to remove that. Also it is good to load up the output to earth with say a 50k resistor?

no,i don't care that,after the LPF,it will be zero DC out

 

[system54]

hello,
nice dac
is the es9038pro able to manage external clock? exspecially 24.576 mhz?
if some sampling rates dont work it doesnt matter.

How much shall the dac cost?

 

[op111op]

hello,
nice dac
is the es9038pro able to manage external clock? exspecially 24.576 mhz?
if some sampling rates dont work it doesnt matter.

How much shall the dac cost?

Thank you

it works to 192KHZ via spdif, the es9038pro request a lowest clock frequency 386FS when spdif, so, if you use a 22.5792MHZ, it can only work in 44.1 and 48khz.

I had tested, the higher the frequency effect the better,below 100MHZ,so i use a 75MHZ,but no to high

I sell it on taobao ,it seems that many friends don't know how to use Taobao

 

[system54]

hello,
as i understand it from your massage the 24,xxx mhz enought for 192mhz?
do you already offer it on taobao?

have you planned an external clock connector (sma/ufl)?

do you offer the dac with rca/bnc connectors or is it possible that you add them to the dac?

 

[op111op]

hello,
as i understand it from your massage the 24,xxx mhz enought for 192mhz?
do you already offer it on taobao?

have you planned an external clock connector (sma/ufl)?

do you offer the dac with rca/bnc connectors or is it possible that you add them to the dac?

both rca and bnc can connet to the dac by yourself, just so easy

but the external clock can not be connected to the dac,because the MCU have some Set item can not be change by user

I have not decided when to put Taobao，because i want to add a i2s input ,isolated

 

[Groundloops]

For optimal i2s signal integrity you need a separate ground return path for BCK, FS and DI as close as possible to the signal line thus minimizing the loop area. Think about providing U.FL socket footprints on your pcb.

 

[op111op]

U.FL socket, it's a good idea ！

For optimal i2s signal integrity you need a separate ground return path for BCK, FS and DI as close as possible to the signal line thus minimizing the loop area. Think about providing U.FL socket footprints on your pcb.

 

[op111op]

Thank you, Groundloops

I have add three U.FL sockets on my board, it will be much better

For optimal i2s signal integrity you need a separate ground return path for BCK, FS and DI as close as possible to the signal line thus minimizing the loop area. Think about providing U.FL socket footprints on your pcb.

 

[Harry Manback]

I am interested in your project. Are these for sale yet?

Thank you!