Issue with Eurorack modules.

latigid on

Hello,

Great that you got the D modules going.

All outputs at -5V (also red LEDs) would mean that nothing is getting into the op amp stage.

A photo of your work might help here to see if it’s something obvious with soldering? Any trouble with the DAC chips? Cables all tested and working and plugged in the right way/correct sockets?
Again, you can wire directly from J19 on the wCore to the superDAC board, but you do need +/-12V power for this.
You can also swap the ribbons on line transmit (and on Euroceiver) to check if the drivers do their jobs. As you know that the D modules already work, this can rule out an issue with the driver.

pat_00

Found the problem. A little surprise from sloppy 2019 Pat.

All works as expected now, except for A1 output 4, which is stuck at 5v. I will do some more inspection of the module, probably a dry solder joint somewhere.

latigid on

Happens to the best of us!

Channel 4 on SuperDAC should come out of pin 4 of J3, if not it must be on pins 18/19 of IC1.
Relevant parts on transmute8 are prefixed with 4Rxx, plus R5, R13, VR4, C17, R21, R53, C25 and the “southern” end of IC2.

Best regards,
Andy

Mechie

It sounded familiar… analogue channel 4…
See Me
The fault finding done in the above thread may be useful to you?

edit…
And Me!

pat_00

Success! It was a bad join at R429 or C17.

I think i need to go back to using a different solder. I’ve been using a Kester ‘no wash’ which seems to make all soldering look grey and not shiny look a good join. Makes telling the good soldering from the bad difficult because it all looks the same.

latigid on

I once got a Stannol solder that just didn’t seem to stick. Same story with some copper braid that was either super old or had no flux in it. For the cost of troubleshooting, it makes sense to stick to something more reliable. Normally the answer is ‘more flux’ 🙂

Best,
Andy

Hawkeye

latigid on Yes, the copper desoldering braid was the only (and probably lowest-quality) brand i could find in the local Obi Baumarkt back when i was a student (a few years ago) - sorry for “gifting you that” - lesson well learned here 🙂.

Many greets,
Peter

latigid on

Well, I didn’t want to name names here! 😃
Not your fault of course!

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