Is there any practical difference between film, MLCC and ceramics for bypassing? I used poly box caps on some early circuits because they had 5mm lead spacing and now I am wondering if these perform worse than ceramics for bypass duties. I think I read somewhere that ceramics have very low ESR and t...

If there's a ground connection through a terminal/screw, you might try cleaning this contact and tightening it - that was the issue with an M-Audio B5a I had with a similar symptom.

Happy new year, Boogie! Glad to hear you are still around and working on this project. Looking forward to the release, and wishing you all the best.

Hi Boogie,

Is this project still live?

I had mine open today and made a bit of progress. On the sequencer / arp not clocking correctly: I had D116 in backward. DOH! fixed. I thought I had fixed the bleed of the Noise/Ext into the output when master volume is down all the way. I noticed today it's following the cutoff of the filter, so if...

Hey Pete, I posted the silkscreens for the boards on the Github page a while back. Print those out on the biggest paper you have and use that to find your components :). Thanks, will do. I managed to fix the bleed: I reflowed the solder on the noise pot and cleaned the flux again, and it's good to ...

groove, did you ever get your bleed issue fixed? No, and I've been away from it for a bit. I cleaned flux (again), replaced the 5532, and looked around as best I could for a bad value resistor somewhere but I don't see anything that looks off. Bit hard to tell against the schematic - I didn't take ...

I finally finished my build and did calibration. I have just to oil the wooden end CAPS(avoiding rehashing the jokes) and add the knobs, once I'm positive I won't have to remove the boards (see below). What a project, this was an easy build and it sounds awesome! I love the build quality of the case...

Sparky wrote: I'd like to report that I'm at the "Go have a beer!" stage in assembly!

Looks awesome, nice work!

I finally unboxed last night - kit looks AMAZING. I managed to find a few minutes to put the PSU together tonight. Looking forward to the rest.

since the charge up voltage is the same as the discharge voltage, Va is constant, and C stays constant. R1 + R2 is almost constant, except for the variation in diode "resistance" as the current through them change as the pot is turned. it doesnt matter where the pot is set, the resistance through o...

I have been playing around with a triangle core oscillator in a circuit simulator. I breadboarded it today and was a bit surprised to see that the pitch is rising when I move the symmetry/shape pot connected to the diodes toward either end of its range (pitch rises toward either extent). I tried cha...

I have been building up a saw core vco on my breadboard, learning about all the various sub circuits and wave shaping. I have found some great resources and schematics that have increased my understanding exponentially (sorry, pun). I've hit a snag on what appeared to be the easiest waveform to sha...

In other news, the bender factory is up and running! I'm tellin you guys these things are buuuuutah! I thinking if there is any demand I will sell them separately for people wanting to build other custom keyboard instruments, upgrades etc..: THIS. I would definitely be interested in another set or ...

Yes on knobs, please.

pete

collumn2016 wrote:Using Eagle you can select where the 3.3v lines go, so followed that around and apart from lifting more pins on the stm the only thing left that i can see is C2.

The 0402 C1 looks like a good thing to rule out early, especially if you have another to replace it.

A quick edit that I've discussed with Janne about: The 4 connectors for attaching the VCO boards to the main B board I found out can only go 1 orientation, so I changed to a different (and actually cheaper) connector. I haven't updated the BOM yet because I haven't tested them yet but I'm 99.9% the...

I uploaded the complete BOMs with Mouser Pns. https://github.com/devinw1/PRO2021 I imported both BOMs into one shared project in Mouser. Obviously use at your own risk - I did no verification other than the import. EDIT: link removed, I am updating the cart per recommended replacement connectors. I...

Replaced the rectifier with this: https://www.mouser.com/ProductDetail/833-2KBP04-BP Seems to be working good now, but the rectifier gets kinda hot. It’s rated for 165C max, so that’s good, but I see now that the current might be low (2A). I don’t see anything else on Mouser with a compatible packa...

devinw1 wrote:BTW, tentative order window for this run is Sunday 02/24!

sent a deposit this morning. Thanks for all of the work you put into this. I really love that it is a complete keyboard!

pete

Asia is all over fakes. That are only 0.3V-3V uSec vs 13V stated in a datasheet. I don't think there is another trusted source to buy ICs these days except major like Mouser or Digikey. Other cheap places are like Russian Roulette. Especially Tayda and Aliexpress (most pirated one). Do you have any...

Love to hear your stories and where the challenges are. through-hole is a known thing, in the sense that there's a standard spacing to it. SMT is a different beast. It's not a monolithic "surface mount" category of difficulty. There are easily soldered SMT sizes like 1206 and 0805, and SOIC chips. ...

Rumour has it the 3M boards are made by this company who sell direct, if you are in the US, which I am not: http://www.assemblyspecialist.com/WebStore/breadboards.html Thanks for the replies, everyone. I ordered one board from Assembly Specialist - I'll report back when I've had a chance to use it ...

I spent a few hours putting together a Moog ladder filter on a breadboard the other night and when I finished it didn't work. I got monkeying around and realized at some point that several connections were loose to the point of being able to pull the parts right out or having so much wiggle they wer...

anyone? :cloud: I wasn't going to answer since I am a novice, but since nobody else has and you threw out the second call, I will bite. Maybe someone can shred this and shed some light. If I were to breadboard this(see below), I would venture to guess: Try switching between the points to the right ...

Hi, I have couple of questions regarding this matter. I’m building a triple 3340 Vco that I intend to use inside a stand-alone monosynth. It will have keyboard, arpegiator, quantisers, so I’m thinking about ways of making them rock solid in terms of pitch stability. I’m so worried about this that n...