and I'm always expanding the documentation section of the historic buchla (100/200 series) pages , with more schematics and notes. Please let me know if you have other information to share! happy wiggling! Grant Richter has uploaded loads of schematics in the Buchla FB group With Grant's permission...

-15 is not used on on this module, so you can leave it unconnected. I only kept the connector for consistency, for folks who have mixed 100/200 series systems.

Delabelle wrote: ↑

Tue Feb 16, 2021 4:19 am

From where do you get the -15v that is not available on the Buchla 100 system?

If I'm reading this correctly, everyone has assumed an architecture where the microprocessor generates the CV outs directly (hence all the DACs etc), which is certainly valid. For an absolute beginner project, though, you might consider an alternative : have the micro just outputting steps, and then...

i use a couple of psychoLFOs all the time to introduce a little wobble into various modulations... i usually increase the osc. caps to at least 10uf to slow it down. i also have a superpsyco, all the additional options (and panel real estate) dosesn't really add too much musical functionality, at le...

nrrrd wrote: ↑

Tue Dec 15, 2020 1:39 pm

The BOM here: http://fluxmonkey.com/pcbDocs/foursesTarp.htm
has a mistake.
The ".1uF" capacitor should be 1uF (105).

dadgummit! sorry about that, Neil, thanks for letting me know. designation on the PCB is correct, and BOM now corrected.

polypropylene. and seriously, the guard tracks are pretty critical, waste of time if you skip 'em. (IMNSHO) properly built, i've been happy w/ mine What I remember about the CGS asr droop discussion was Ken saying emphatically that you have to use the correct caps. Which makes complete sense. Don’t ...

I found some here on Thonk's website: https://www.thonk.co.uk/shop/ginkosynthese-grains-full-diy-kit/ Would be great to see all these collected in an official Github repository or something. Maybe I'll put one together this weekend. Not sure where other Grains firmwares might reside though https://...

yeah, as a voltage divider:

i use graph paper, make a rough guess and draw it out, and then literally place the pots/knobs/switches/jacks on the paper to see if everything fits, and adjust where it's too close.

i have PCBs available for this: http://fluxmonkey.com/fluxmerch_buchla.htm. it runs fine on 12v without changes. the outputs swing close to the rail, though - i usually build mine with attenuators on the panel for each out, or voltage dividers behind the panel to bring them down to a more reasonable...

i use audacity for sound design, and reaper as a daw, and have never had serious problems. i also use audacity in teaching, and it's great for introductory musique concrete workshops because it's relatively easy to use and free. i have occasionally used it in a pinch as a crude daw for small quick p...

@fluxmonkey: that looks really good! Can you tell us which capacitors you used on your range switches, what type of switches you used and how they are wired up, please? I’ve still got to build mine... Other projects and home life getting in the way! 😀 i used 4 SPDT center-off switches. A .001 cap i...

"resonant VCF high pass-24 dB / octave"... great to hear, he has consistently solid designs.

rather pleased with how this one came out... 3-way range switches, 2-input passive mixer to the 386 amp. gonna replace one of the mixer ins w/ a passive tone control (LPF-ish). it's gnarly.

sduck wrote: ↑

Sat Oct 24, 2020 7:07 pm

Yes, they'll work interchangeably. I have both here, and have put them on top of each other - except for some small differences in hole sizes there's no difference.

excellent, thank you! this had languished in my backlog, partly because of the amount of rework required on the V1pcb...

I've only ever used EAGLE to the former end - creating artwork for a laser print - and know nothing of the additional steps necessaery for, or expectations of, a PCB fab house. All my designs are two layer thru-hole; not complicated. Also low runs, 5-10. Sounds like you have basic Eagle layout know...

has the panel layout changed since v1? I have a v1 panel, can I use it with the V4 PCB?

i build mine to run off a pair of 9v batteries... it does not draw a lot of current, batteries last a couple months unless i forget to turn it off after playing.

Awesome, thanks. I was thinking of building this and didn't fancy it on a paper circuit. It looks like you've corrected the mistake on the paper circuit as well. :tu: I've ordered two to make a double tarp, maybe with a shmance instead of the eight knobs. mistake?? :? only Allah is perfect :hail:

google "pcb edge mounting hardware" and you may find something that will work for you; i've used these: https://www.adafruit.com/product/1116

I print 2 copies: one glue on w/ rubber cement to use as a drill guide, then i strip that off and use spray adhesive (scotch77) to glue on the final paperface copy. i also often use a self-adhesive laminate sheet, with the top/bottom wrapped around and behind the panel.

with Peter's kind permission, I have made a few PCBs for the Fourses Tarp paper circuit. foursesTarp_silkscreenNaked.jpg The original paper circuit is here: https://www.ciat-lonbarde.net/paper/fourses.pdf; I've added an (optional) LM386 amplifier to make it more self-contained. More info and BOM on ...

I have also been working on a new module idea. Here is a rough sketch. Let me know what you think: I know it's a joke, but I've been thinking of a module that displays random entries ifrom Brian Eno's "oblique strategies". Would be very cool if it was voltage controlled :) I love this idea. It seem...

This is why I love Oakley. Tony!