I received a bunch of Ciat-Lonbarde printed circuit boards made by Josh Rodriquez from paper circuit images or of his own design. He gave me these in appreciation of the support and documentation I’ve done for Peter Blasser’s designs. I’m grateful. I’ll be looking at these and choosing some to build and document.
I’m especially interested in drawing a proper schematic diagram for the Tetrazzi. I have the paper circuit image, but it’s much easier to trace the connections on an actual board.
As a long time lurker on your site, I have to say… I’m very excited about this. I’ve learned so much from looking at your schematics and reading your breakdowns of specific modules and stand alone instruments. Thank you for choosing to document your adventures, and for so generously sharing them with faceless strangers.
I recently completed my first attempt at converting a schematic into a board design, Ciat Lonbarde style, as the schematic in question happens to be for the mixer you included with your Rolls-5 build. It doesn’t appear that I can upload an image here, but if you’re interested in what you’ve inspired, the image exists within the Lines forum.
https://llllllll.co/t/mobenthey-ciat-lonbarde-synthmall-thread/3322/2466
Hi Alan,
The Pugixer, eh? (Pugix mixer) Have you built it yet? Looks good. As to your question about placement, for this kind of simple circuit it’s okay.
Ha! At the time I rendered it out, “Pugixer” was the most organic feeling name for the jpg. Thank you for having a look at it.
I certainly plan to build it, though I’m waiting to have the boards fabricated as I’ve a few other projects on deck (Quantussy petals converted into 6X1″ boards for a 4U boat, for example). I’ve cross-referenced your mixer design with some of Ken Stone’s in an attempt to find a “Universal” mixer that I can use with multiple C-L builds. As I mentioned, I’m still quite new to breaking down schematics (and/or building from them), but I’ve found that I have a greater appreciation for the instruments after trying to gain more insight into them. I’m currently trying to figure out whether or not your Rolls-5 mixer design would be suitable for something like Fourses Tarp. I quite like the idea of utilizing multiple source nodes for individual track recording, or simply for more control over the chaos. Being that all of the nodes are androgynous, would a DC-coupled mixer be more appropriate, or would it appear that I need to take an electronics course(s tarp)?
For these single supply voltage Ciat-Lonbarde circuits, you want AC-coupled mixing, because the signals are centered around the supply voltage divided by two. The AC-coupling removes the offset, which is a good idea when connecting to external gear. The only change I’d make on my circuit would be to hook the 33K feedback resistor to the other end of the 330 ohm resistor, i.e. connect the 33K resistor directly to the op amp output. There are reasons to do it either way, but you’d need an electronics course to have the explanation make sense. 🙂
Touché.
While I can’t say that I have any idea as to what the reasons would be, either way, I feel confident that the aforementioned change would have altered the outcome of my original inquiry regarding component placement. That is, assuming I had laid out this board exactly as I have in an alternate universe wherein your desired 33K change had already manifested.
That was a bit of a word salad! But, now I’m intrigued… if anyone needs me, I’ll be down a rabbit hole of AC vs. DC coupling for the foreseeable future. Though, I fear what I’m going to find down there is math.
Hey there, Richard… long time, no type.
I finally got around to ordering a few of the Pugix Mixer PCBs, and they are currently “in production.” If you’re interested in having one for your archives, I’d be happy to send one your way. As I’ve prepared the necessary boards for the entire Rollz-5 as well, I’ll have a few left over if you’d like to build one utilizing your namesake Mixer (I think I’ll only have enough for a 1/2 Rollz though, but still… never enough rolls in the world of Ciat-Lonbarde). Also, I opted to leave the mixer as it was originally designed, as I never figured out the reasoning behind your feedback resistor change (I imagine it has something to do with feedback and resistance, but I’ve been wrong before).
Let me know what you think, and we can exchange info if you’re interested. And, forgive me for reaching out to you via the comments section… I can’t seem to find a direct route to private correspondence on this site (if in fact there is one).
Anyway, I hope all is well.
Hi Alan,
Thanks for the PCB offer, but I’m not planning to build another Rollz-5, seeing that I have a Plumbutter, too!
I don’t have a contact form here, but it might be a good idea to add one. Another way to get hold of me would be to join muffwiggler.com. You could benefit from the Ciat-Lonbarde group and you can PM me there (as pugix).