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* Much wiring is done at the panel itself. This makes it hard to swap the front panel with a more robust one. When I'm building other YuSynth modules, I'll re-design the PCB first to have one connector for each front panel element, even if it might bring a bit of noise into the system.
* Much wiring is done at the panel itself. This makes it hard to swap the front panel with a more robust one. When I'm building other YuSynth modules, I'll re-design the PCB first to have one connector for each front panel element, even if it might bring a bit of noise into the system.
** Because I didn't like wiring behind the front panel, I added a separate PCB where I bring connected front panel elements together.
** Because I didn't like wiring behind the front panel, I added a separate PCB where I bring connected front panel elements together.
** Another thing to add to the PCB would be having the octave switch and sync connectors optional, so one can decide to skip or implement both switches by connecting a jumper and a set of connectors.
* Because I'll re-layout the modules anyways, I have an idea of adding a PSU adaptor to each board, so I can build one board and use several different power connectors.
* Because I'll re-layout the modules anyways, I have an idea of adding a PSU adaptor to each board, so I can build one board and use several different power connectors.
* The schematic contains resistor names, but they are missing from the boards. So it is very hard to debug because only values, not names, are printed on the PCB.
== Issues ==
== Issues ==
* After the build, the VCO works! No magic smoke ;)
* All major issues solved. Works like a charm!
* The sine looks very odd. Negative curve looks good, positive curve looks strange. Seems like the positive Voltage breaks, probably a swapped resistor on the board, or the lab PSU doesn't work too well...need to investigate
* If the frequency pot is turned to 5 (center), the frequency is already very high. Need to investigate if this is wanted or a "bug".
* Saw looked good, don't remember tri and pulse.
* Switching from hard sync to soft sync causes a minor frequency. Not sure why, needs investigation. Maybe fixes itself once a CV voltage is applied
== Previous Issues ==
* The sine looked very odd. This wasn't actually a bug - T3 wasn't adjusted. I accidently had the scope set to AC coupling, so I actually didn't touch T3.
== Experiments ==
* Once the heat gun has arrived, test how well the tempco works.
I've etched a PCB with the original PCB provided by Yves
The board was populated, soldering pad size was very good, so this was done in about two hours
The panel was made of 2mm wood, hand-marked and drilled holes for the panel elements. The front panel design was made by myself and printed onto Zweckform 3487 white plastic sheets using a CLP-315 color laser printer. It was glued with "spray glue" onto the wooden panel.
It is noteworthy that the etching and soldering the PCB took only about 3 hours, while creating the front panel and wiring the connections took about at least 6 hours. Overall build time was 9-10 hours, planning time was the same amount.
I also thought that I probably want an aluminium front panel, but due to the very good results with the plastic sheets, I probably will stick to them for cost reasons. The 2mm wood panel also seems to be quite solid.
Construction Troubles
There are several issues:
Much wiring is done at the panel itself. This makes it hard to swap the front panel with a more robust one. When I'm building other YuSynth modules, I'll re-design the PCB first to have one connector for each front panel element, even if it might bring a bit of noise into the system.
Because I didn't like wiring behind the front panel, I added a separate PCB where I bring connected front panel elements together.
Another thing to add to the PCB would be having the octave switch and sync connectors optional, so one can decide to skip or implement both switches by connecting a jumper and a set of connectors.
Because I'll re-layout the modules anyways, I have an idea of adding a PSU adaptor to each board, so I can build one board and use several different power connectors.
The schematic contains resistor names, but they are missing from the boards. So it is very hard to debug because only values, not names, are printed on the PCB.
Issues
All major issues solved. Works like a charm!
If the frequency pot is turned to 5 (center), the frequency is already very high. Need to investigate if this is wanted or a "bug".
Switching from hard sync to soft sync causes a minor frequency. Not sure why, needs investigation. Maybe fixes itself once a CV voltage is applied
Previous Issues
The sine looked very odd. This wasn't actually a bug - T3 wasn't adjusted. I accidently had the scope set to AC coupling, so I actually didn't touch T3.
Experiments
Once the heat gun has arrived, test how well the tempco works.