If you use pin strips to fix the displays to the mcu board the usually used combo is 10mm tall so I took this into consideration when doing the calculation.
The display is 3.5mm tall, 1mm for the pcb and 2,5mm for the metal frame in front. If you sum the 10mm height of the strips to the 3.5mm of the display you have 13.5mm from mcu pcb to the front of the display.
There are the pins of the strip that advance a bit in front of the display but these can be easily clipped off.
In your drawing for the front panel you have extruded 8mm for the display from the back to the front. Inside this extrusion modushop mounted a 3mm thick plexiglass so there are only 5mm remaining from the 8mm.
To have the front of the display fit next to the plexiglass you need standoffs with a height of 8.5mm(13.5-5) so from here I said that I think you used 9mm standoffs.
I wanted to ask if you used m3 male to female hex standoffs or non threaded female standoffs ? Judging by the holes that you have in the front panel seems you are using non threaded female standoffs.
The display is 3.5mm tall, 1mm for the pcb and 2,5mm for the metal frame in front. If you sum the 10mm height of the strips to the 3.5mm of the display you have 13.5mm from mcu pcb to the front of the display.
There are the pins of the strip that advance a bit in front of the display but these can be easily clipped off.
In your drawing for the front panel you have extruded 8mm for the display from the back to the front. Inside this extrusion modushop mounted a 3mm thick plexiglass so there are only 5mm remaining from the 8mm.
To have the front of the display fit next to the plexiglass you need standoffs with a height of 8.5mm(13.5-5) so from here I said that I think you used 9mm standoffs.
I wanted to ask if you used m3 male to female hex standoffs or non threaded female standoffs ? Judging by the holes that you have in the front panel seems you are using non threaded female standoffs.
These push buttons made out of aluminium are indeed looking very nice, thanks for sharing!
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A general hint here, I adapted using female/female standoffs and then depending on needs use either a normal screw or a headless screw. Put a headless screw on one side and you get a male/female standoff. Two headless screws on both sides and you get a male/male standoff. Makes life easier and reduces spare parts.
Indeed looking very nice, congrats on that beautiful job.
You say you did order the front panel at Modu, right?
Yes, indeed. They did a very nice job and I recommend Modushop.
The drawings shared here that I copied mostly from Ine aren’t ment to be used with the standoff type I wanted to use(male/female) and I needed to modify the drawings (this after sending the drawings to Gianluca). I think Ine uses passive standoffs. So being lucky I was able to modify the drawings.
In the end I am satisfied with what I got for the money I paid. It’s too long that I host the pcbs on the floor or on the table. They needed a decent enclosure.
Still have to get the enclosure for the power supply… when time comes.
Edit: you can use the shared drawings that I share but with those you need to use blind standoffs.
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One thing to mention if there is anybody who wants to build his pre in a modushop 2u enclosure. If you want to use the drilled internal base to save some holes in the bottom cover, you need to reverse all the strip connectors on the backside.
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I built the UGS long time ago, in 2017 following the GB in HCFR thread and never have any issue...
In November I leave my house for one month and I switch off all my system, unpluged all main AC for safety, internet connections, etc.
Back two weeks ago I reconnect everything and now I have a problem on the right channel:
After 15/20 minutes playing well the right channel stop for few second than start again. After few minutes stop again for longer and restart, random.
First of all I checked the connections and everything is fine.
After swapping between the outputs and the inputs I realize that is the UGS.
I swap the 2 USG modules but nothing change
I keep it in the banch with the PSU and I start to check all the various values, everything is fine.
I dismounted all the PCBs, resoldered all the various connectors on the back board and preampli board.
Riassembled, riconnected but the problem is still there, stop to play randomly after a while.
The problem is random so it's really difficult for me to understand where can be the issue and I was thinking to change all the ICs in the preampli board (I have all the ICs with the exception of the MUSES).
Before to proceed and to have a confirmation that the problem is in the preampli board last night I swap the P2 and P6 connection from the MCU.
With BIG surprise after 2 hours playing is working well without any interruption (???).
Now I am really confused... if there is any hardware issue why don't show up again? I really don't know what is going on
In the next days I will do some more long listening session. In one side I hope that the problem pop-up again, at least to understand if it's in the preampli or in the MCU.
Maybe someone have the same issue?
Any suggestion will be highly appreciate
Thanks,
Enrico
PS: I noticed that the inputs are now flipped (to connect to input 2 I should press the input 3 and viceversa) but I think that is relevant to the address of the boards
In November I leave my house for one month and I switch off all my system, unpluged all main AC for safety, internet connections, etc.
Back two weeks ago I reconnect everything and now I have a problem on the right channel:
After 15/20 minutes playing well the right channel stop for few second than start again. After few minutes stop again for longer and restart, random.
First of all I checked the connections and everything is fine.
After swapping between the outputs and the inputs I realize that is the UGS.
I swap the 2 USG modules but nothing change
I keep it in the banch with the PSU and I start to check all the various values, everything is fine.
I dismounted all the PCBs, resoldered all the various connectors on the back board and preampli board.
Riassembled, riconnected but the problem is still there, stop to play randomly after a while.
The problem is random so it's really difficult for me to understand where can be the issue and I was thinking to change all the ICs in the preampli board (I have all the ICs with the exception of the MUSES).
Before to proceed and to have a confirmation that the problem is in the preampli board last night I swap the P2 and P6 connection from the MCU.
With BIG surprise after 2 hours playing is working well without any interruption (???).
Now I am really confused... if there is any hardware issue why don't show up again? I really don't know what is going on
In the next days I will do some more long listening session. In one side I hope that the problem pop-up again, at least to understand if it's in the preampli or in the MCU.
Maybe someone have the same issue?
Any suggestion will be highly appreciate
Thanks,
Enrico
PS: I noticed that the inputs are now flipped (to connect to input 2 I should press the input 3 and viceversa) but I think that is relevant to the address of the boards
Sorry to hear about your finding.
In my preamp I found an issue with how the mcu saves everything in the memory.
After the first power on(first time I connect the mains) I don’t have sound at all, I get a strange name for output 1 and the preset for the volume isn’t the one that I setup.
What I have to do is cycle the output name until it’s displayed correctly, put the preamp to standby and turn it on again. If I do this at the next power on everything is ok.
If I unplug again the mains, same situation as above will happen again.
I asked already Alex to look on it since this summer but seems he’s busy.
When you get again that issue try to cycle the inputs and outputs and then put the preamp to standby and turn it back on, I bet it won’t happen again until you disconnect again the mains.
In my preamp I found an issue with how the mcu saves everything in the memory.
After the first power on(first time I connect the mains) I don’t have sound at all, I get a strange name for output 1 and the preset for the volume isn’t the one that I setup.
What I have to do is cycle the output name until it’s displayed correctly, put the preamp to standby and turn it on again. If I do this at the next power on everything is ok.
If I unplug again the mains, same situation as above will happen again.
I asked already Alex to look on it since this summer but seems he’s busy.
When you get again that issue try to cycle the inputs and outputs and then put the preamp to standby and turn it back on, I bet it won’t happen again until you disconnect again the mains.
Thanks for the suggestion...
I will keep the P2 and P6 inverted for some time now to see if the the problem show up again.
If don't show up anymore I will put back as original and try what you did.
If show up and in the same channel mean that the problem is in the preamp board
Alex is really a kind and helpful person. If he don't back to you mean that is very busy
I will keep the P2 and P6 inverted for some time now to see if the the problem show up again.
If don't show up anymore I will put back as original and try what you did.
If show up and in the same channel mean that the problem is in the preamp board
Alex is really a kind and helpful person. If he don't back to you mean that is very busy
Hi shultzsch,
I got anothere listening session last night with the P2 and P6 inverted and it happen again in the LEFT side.
Clearly the issue is not in the preamp board but in the MCU... well, at least I know now where is the problem.
Tonight I will try what you suggest and get another run. Hopefully you are right and I can solve.
In case of failure I will try first to reset the STM and reload the firmware.
In case of failure again, I will change the STM.
With my knowledge I don't have other idea...
I got anothere listening session last night with the P2 and P6 inverted and it happen again in the LEFT side.
Clearly the issue is not in the preamp board but in the MCU... well, at least I know now where is the problem.
Tonight I will try what you suggest and get another run. Hopefully you are right and I can solve.
In case of failure I will try first to reset the STM and reload the firmware.
In case of failure again, I will change the STM.
With my knowledge I don't have other idea...
Good morning @emyeuoi
You could connect the scope on the muses clock pin(19) and check what happens when you get the issue.
From what you say it’s clearly not a mcu hw fail but it could be the isolator.
With a multi channel scope you can see what happens exactly after the failure and you can also capture the moment of failure but more difficult or you could buy a cheap digital signal analyzer that is able to monitor all the data lines for a long period.
In my case resetting the preamp to the default settings and clearing the memory changed the behavior of the issue.
Initially the mcu shorted the negative input to gnd which could be solved by putting the preamp to standby and back on. After reset the issue changed to what I have now and written about earlier.
When you say restart do you mean the preamp restarts(you see the turn on screen) or the channel starts to send music again?
when this happens do you wait to get music again or you put to standby the preamp and back on again? Or you unplug the mains and then turn back on the preamp?
You could connect the scope on the muses clock pin(19) and check what happens when you get the issue.
From what you say it’s clearly not a mcu hw fail but it could be the isolator.
With a multi channel scope you can see what happens exactly after the failure and you can also capture the moment of failure but more difficult or you could buy a cheap digital signal analyzer that is able to monitor all the data lines for a long period.
In my case resetting the preamp to the default settings and clearing the memory changed the behavior of the issue.
Initially the mcu shorted the negative input to gnd which could be solved by putting the preamp to standby and back on. After reset the issue changed to what I have now and written about earlier.
Hi schultzsch, thanks for your support... really appreciate
I mean that the channel start to send music again without I am touching anything.
This happen for 10/15 seconds after 15/20 minutes that is playing both channels
I get music again and after a while disappear again for few seconds, sometime for more... is completely random 🙁
Well, I have inverted the P2 and P6 connectors that connect the MCU to the right and left boards.
As I said, last night I get the problem in the LEFT board while, before I swap the P2 and P6, the problem show up in the RIGHT channel.
For me is clear that the problem is in the MCU board (HW or FW I don't know) and the preamp board(s) have no issue.
To capture the failure with the scope is really hard. As I said the problem is so random that I can't imagine how I can catch with a scope connected when the preapli is playing music.
Looking at the schematic, the P2 and P6 are directly connected to the MCU, hence I think to reupload the FW or, last chance, change the MCU.
BUT I am open to any other suggestion...
Cheers,
Enrico
I mean that the channel start to send music again without I am touching anything.
This happen for 10/15 seconds after 15/20 minutes that is playing both channels
I get music again and after a while disappear again for few seconds, sometime for more... is completely random 🙁
Well, I have inverted the P2 and P6 connectors that connect the MCU to the right and left boards.
As I said, last night I get the problem in the LEFT board while, before I swap the P2 and P6, the problem show up in the RIGHT channel.
For me is clear that the problem is in the MCU board (HW or FW I don't know) and the preamp board(s) have no issue.
To capture the failure with the scope is really hard. As I said the problem is so random that I can't imagine how I can catch with a scope connected when the preapli is playing music.
Looking at the schematic, the P2 and P6 are directly connected to the MCU, hence I think to reupload the FW or, last chance, change the MCU.
BUT I am open to any other suggestion...
Cheers,
Enrico
To be sure it’s the mcu(hw or fw) you could place the scope on the channel with the problematic digital lines and watch what happens when the fault occurs.
Replacing the mcu would be my last choice.
Try first to delete the settings and to reset the preamp to the default settings and check how it works after.
Replacing the mcu would be my last choice.
Try first to delete the settings and to reset the preamp to the default settings and check how it works after.
Dear schultzsch,
good news... look like I found the problem 🙂
I re-upload the FW last night but didn't solve the issue, the right channel stop to play after a while.
I want to make some measurement while playing and by chance I touch the encoder cable, the channel is back playing!
I unplug and plug back the encoder connector (encoder side) and the problem is gone... I can play music for 2 hours without any issue.
I need to make a longer test to be sure but my feeling is that it's solved.
Thanks a lot for your support so far... I hope I don't need to back again 🙂
All the Best and Happy New Year,
Enrico
good news... look like I found the problem 🙂
I re-upload the FW last night but didn't solve the issue, the right channel stop to play after a while.
I want to make some measurement while playing and by chance I touch the encoder cable, the channel is back playing!
I unplug and plug back the encoder connector (encoder side) and the problem is gone... I can play music for 2 hours without any issue.
I need to make a longer test to be sure but my feeling is that it's solved.
Thanks a lot for your support so far... I hope I don't need to back again 🙂
All the Best and Happy New Year,
Enrico
Hi Enrico,
Good that you found the issue 🙂
Hi Schultzsch,
Sorry to be late replying to your need of FW modification.
I am going to work on this very soon and congratulations for your panel designs, they look gorgeous.
Good that you found the issue 🙂
Hi Schultzsch,
Sorry to be late replying to your need of FW modification.
I am going to work on this very soon and congratulations for your panel designs, they look gorgeous.