You may want to try to find a similar board that supports volume control (where there is a connector on the board for that) and regular jumpers for switching filters. I ordered some previously so such board existed at least.
Also have to say that rewriting the firmware just looks like a nightmare, I did that for increasing PLL bandwidth of the DAC. It took about 2 weeks from scratch, knowing nothing about MCUs in advance.
And one note more in connection with the board design. SABRE recommends using current output of the ES DACs, but that board uses voltage output to minimize quantity of OPAs required probably. So the analog part of the board just kills the signal quality you might potentially have from ES9038Q2M. There is a way to semi-improve the board and implement home-made “unbalanced current output” approach instead of “balanced voltage output” one basing on the same OPA, some printed wires have to be cut and some to be soldered. This makes the signal quality much better but still not as recommended “balanced current output”. If you need the schematics diagram welcome
Also have to say that rewriting the firmware just looks like a nightmare, I did that for increasing PLL bandwidth of the DAC. It took about 2 weeks from scratch, knowing nothing about MCUs in advance.
And one note more in connection with the board design. SABRE recommends using current output of the ES DACs, but that board uses voltage output to minimize quantity of OPAs required probably. So the analog part of the board just kills the signal quality you might potentially have from ES9038Q2M. There is a way to semi-improve the board and implement home-made “unbalanced current output” approach instead of “balanced voltage output” one basing on the same OPA, some printed wires have to be cut and some to be soldered. This makes the signal quality much better but still not as recommended “balanced current output”. If you need the schematics diagram welcome
thanks, would be interesting to see the home made unbalanced current output method diagram
I did buy that board and the sound quality wasn't very good, so would be interested to see if it could be improved
there was no ess harshness to the sound, so maybe shows it's a good chip to base a dac on
I did buy that board and the sound quality wasn't very good, so would be interested to see if it could be improved
there was no ess harshness to the sound, so maybe shows it's a good chip to base a dac on
I bought one too. In terms of sound, it's a big step back from the 9038, at least that's what the Chinese pcb produced. The right side of the output clicked periodically, which was caused by a fault in the i2c line or code error i dont know, didn't try to find out if it was coming from the dac side or the mcu, I just grabbed it and threw the whole thing in the trash.
Sorry, the drawing is quite crude, I'm embarrassed to show it publicly, so I've sent it to you in a private message.
Take care, 1st order LPF only (that limited by single OPA for 2 channels) lefts significant radio frequency level on the output. Unfortunately nothing can be done with the existing components on the board. I have been thinking about a custom breadboard with recommended I/V convertor and 8 pin DIP connector to be inserted instead of the genuine NE5532, but so far it's just a plan ))
Take care, 1st order LPF only (that limited by single OPA for 2 channels) lefts significant radio frequency level on the output. Unfortunately nothing can be done with the existing components on the board. I have been thinking about a custom breadboard with recommended I/V convertor and 8 pin DIP connector to be inserted instead of the genuine NE5532, but so far it's just a plan ))
Had the same because of the too narrow PLL bandwidth, that's why had to rewrite the firmware, The bandwidth is I2C controlled solely