[build] dual 281 boards

[tuukka.j]

Is there any reason why I should not take the B+ and GND from one pin on the PCB for all the pots, switches and leds?

Other than the mechanical of course, but as I'm building my own PCB for the panel components (for reasons) that shouldn't be an issue.

So is there any electrical reason for taking the GND and B+ from different spots on the PCB?

[Triglav]

Is there a trivial way to add LEDs for the PULSE OUTs or would I need to build something like the CGS LED driver?

[Triglav]

Well, this was a nightmare to wire but it's done:

[lasesentaysiete]

Triglav
impressive!

[Triglav]

Thanks!
I do have a couple of questions though.
— Has there been a reliable mod to reliably start the cycle when flipping the switch? Is the mod on https://modularsynthesis.com/roman/buch ... 81_qfg.htm applicable to 12V builds?
— It seems like the outputs are 0-10V. Is there a simple way to make it 0-8V? The build docs suggest that it should be 0-8V with the 1.33k resistors.
EDIT:I have solved this with simple voltage dividers on the outputs. Seems to work fine.

EDIT2: Wiggler cygmu was kind enough to draw up a cycle mod. It's now working like a charm:

[syn]

Thanks for posting this. I'm about to finish up this one, just wanted to make sure that components within red circles are to be added in order to achieve the cycle mod?

Thank you

[Triglav]

The bottom circle is already included on the board. You just need to add the top one.

Here's the schematic of what's already there. (The 1.8nF has been replaced by the 2.2 nF in later BOMs.)

[syn]

Great!

Thank you

[finnurbjarna]

EDIT: I would say, check the TL061 and orientation of the diodes around it - that is almost certainly the summing mixer for the peak out - check your soldering around that area

Good luck!

Six year old advice can still be good advice!

The peak out had never worked on my build so I decided to skim the thread and take another look and, sure enough, I'd stuck in a TL062 instead of an 061

All working like a charm now. I also used the opportunity to swap the retina-burning blue LEDs that I had for some reason put in for some gentler green ones. It's a great module, worth the rat's nest wiring.