I used these neb :
https://au.rs-online.com/mobile/p/aluminium-capacitors/5194273/
The original bom did specify low esr. I matched the Mouser part number so I could order from rs.
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Neb, I have just uploaded your new code with the menu adjustments, much more friendly & great work. 
My feedback (nothing critical):
On the volume bump... I think I also have this. My volume range is 50 as your code has preset. Turning the volume up results in an audible jump in volume between 26 & 27. When turning the volume down there is an audible click when going from 27 to 26.
If I observe the DC voltages at R25 & R33 I notice a huge change over R33 (RSH) at the 26/7 crossover point.
With the volume at 26 R25 is at 1.575V and R33 is at 1.024V. With V=27 R25 is 1.593V and R33 is at 4.653V so I guess that validates your code query
My feedback (nothing critical):
- When clicking through the selections, the screen is fine. However if a change is made while in the line out menu the cursor block is left behind if you press again to return the volume screen rather than letting the selection timeout.
- Volume bar breakup on fast scrolls
On the volume bump... I think I also have this. My volume range is 50 as your code has preset. Turning the volume up results in an audible jump in volume between 26 & 27. When turning the volume down there is an audible click when going from 27 to 26.
If I observe the DC voltages at R25 & R33 I notice a huge change over R33 (RSH) at the 26/7 crossover point.
With the volume at 26 R25 is at 1.575V and R33 is at 1.024V. With V=27 R25 is 1.593V and R33 is at 4.653V so I guess that validates your code query
I'd go with the display. I have a simalar size display and ZDRs code and it is just fine.
I just built another VxD with Nichicon low ESR caps at DAC outputs. At first, I could not hear a bump, but I spotted it immediately with pink noise. It seems shorter and smaller, but it's there. Very difficult to hear with music.
And yes, new FET I found works just fine, everything calibrated on first run with SR3s:
https://www.fairchildsemi.com/products/discretes/fets/mosfets/FDV301N.html
I found my oled so I will try to weed out the bugs when time allows it.
And yes, new FET I found works just fine, everything calibrated on first run with SR3s:
https://www.fairchildsemi.com/products/discretes/fets/mosfets/FDV301N.html
I found my oled so I will try to weed out the bugs when time allows it.
Neb, I have just uploaded your new code with the menu adjustments, much more friendly & great work.
My feedback (nothing critical):
- When clicking through the selections, the screen is fine. However if a change is made while in the line out menu the cursor block is left behind if you press again to return the volume screen rather than letting the selection timeout.
- Volume bar breakup on fast scrolls
All should be fixed now, please check.
This is it, confirmed with debug. Audible bump is right at the point where current range is set, setLSH, setLSE, setRSH and setRSE.
Thanks for checking, that's good news. If you don't have this issue, then there must be a way to get rid of it in my setups as well.
Sent from my MI 5s using Tapatalk
Don't think so cos I'm using the SR2's with Nebs code. For me the symptoms are at the 26-27 (out of 50) volume steps.
Attached are two scope traces. The Blue line is the voltage over R33 (RSH) and Red over R25 (RSE). The first screen grab is at vol 26 and the second at 27 where yoo can see the jump in RSH which results in the audible bump.
I'm currently using a tool called Meld to compare Nebs code with Vincents V1 code to see if there are any typos etc. I'll let you know if I find anything.
Attachments
Nope can't see anything obvious in the code. As you might imagine the main differences are in the OLED handling and various Control (Menu) structures.
The calibration and volume routines all see the same.
I'm wondering if it has been there all the time? Most people will just build as quick as they can to the final result without testing and with music playing it is not that noticable. I tested with a 1kHz signwave and it is obvious
The calibration and volume routines all see the same.
I'm wondering if it has been there all the time? Most people will just build as quick as they can to the final result without testing and with music playing it is not that noticable. I tested with a 1kHz signwave and it is obvious
