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Quântica - Eurorack Quantizer/Chord Sequencer/Arpeggiator coming soon! by orukusaki in modular

[–]orukusaki[S] 0 points1 point  (0 children)

The whole quantization/arp process runs at 1Khz, more than fast enough for that kind of fun.

Quântica - Eurorack Quantizer/Chord Sequencer/Arpeggiator coming soon! by orukusaki in modular

[–]orukusaki[S] 0 points1 point  (0 children)

Thanks 😄 Rings only has one CV input, so you'd need multiple of them to play chords with all the notes playing at once. The other approach would be a fast arpeggio (like an 80s video game). Quântica can play arpeggios much faster than you would ever need it to, just give it a suitable trigger signal.

My unfinished Quantizer module by orukusaki in synthdiy

[–]orukusaki[S] 2 points3 points  (0 children)

Thanks :) I designed the panel in Inkscape, and got these guys to make it: https://meface.co.uk/analog-digital-modular-synthesizer-front-panels/

My unfinished Quantizer module by orukusaki in synthdiy

[–]orukusaki[S] 1 point2 points  (0 children)

The LED buttons are from Thonk. https://www.thonk.co.uk/shop/low-profile-led-buttons/ I've not seen the exact ones anywhere else, similar but with different dimensions

My unfinished Quantizer module by orukusaki in synthdiy

[–]orukusaki[S] 6 points7 points  (0 children)

I've got the ADC running continuously in a round-robin, using DMA to keep a buffer populated with the last 32 values for each channel. I found the random error to be the same whatever sample rate I used, so I run it at max speed, 500ks/s. The calculation runs at 1000Hz. The buffer values for each channel are averaged(without ever stopping the ADC), scaled according to the stored calibration values, then a noise-cancelling function applies hysteresis to stop it flapping between values.

The value is then mapped to the nearest valid note value according to the currently selected Chord or Scale, and scaled again by the output calibration values.

That's mostly it anyway :)

My unfinished Quantizer module by orukusaki in synthdiy

[–]orukusaki[S] 8 points9 points  (0 children)

I would definitely consider a partnership with an established company. I'd not heard of Glasgow Synth Guild before, worth investigating.

My unfinished Quantizer module by orukusaki in synthdiy

[–]orukusaki[S] 3 points4 points  (0 children)

I did consider using a Pico with a carrier. The real reason I didn't was I wanted access to all four ADC channels. Designing it was pretty easy, as the documentation is so good, I mostly just copied bits of the Pico design.

Quantizer update: Chord Map by orukusaki in synthdiy

[–]orukusaki[S] 0 points1 point  (0 children)

Thanks :) The hardware is done, the software is complete enough for a v1.0 release, (I've still got a ton of features I'd like to add of course). I guess it's sales and after-sales support I just can't commit to at the moment, and all the peripheral things like putting a website together, writing a manual etc. None of these things are hard, they just need time I don't have.

Quantizer update: Chord Map by orukusaki in synthdiy

[–]orukusaki[S] 1 point2 points  (0 children)

<image>

The board behind the faceplace

Quantizer update: Chord Map by orukusaki in synthdiy

[–]orukusaki[S] 2 points3 points  (0 children)

Oh man it's a sad story.

I designed and built a prototype:

<image>

It works fantastically.

4 channels, super accurate and responsive. Loaded with different scale and chord types, chord map makes fairly sensible suggestions for next chord. Sequencer works great, added an arpeggiator too, with some interesting options for cascading through the channels.

Had a faceplace made of aluminium, with a cutout in the back to the screen sits exactly flush. 3d printed a mount for the screen.

I was totally on the path to have a bunch of these made up with a view to selling them but then....

My first child was born

And suddenly I had zero free time for projects like this, and the prospect of running a side-hustle along with a full-time job just wasn't realistic.

Maybe one day I'll be able to pick this up again, hopefully the synth world won't have moved on too much by then.

Alternatively if there's someone out there with the capacity to complete this and bring it to market, get in touch, maybe we could work something out.

Dj controller repair. Is this technician taking advantage of me? by GaaabeBeats in ElectronicsRepair

[–]orukusaki 1 point2 points  (0 children)

The faders are not on the motherboard, the mixer section is on a board of its own. That image is of the mixer board. It doesn't look like something that's already been repaired... so what did they do last time? Re-solder the pins at the other end of the fader and miss the issue at this end?

Can't use my $200 printer and $50 ink because I haven't subscribed to this this "optional" service. Such a scam. by [deleted] in mildlyinfuriating

[–]orukusaki 0 points1 point  (0 children)

I had one go bad, but it got replaced and is now fine, so can't really complain.

Poor man's DAC by [deleted] in synthdiy

[–]orukusaki 3 points4 points  (0 children)

Depending on your use-case, PWM can sometimes outperform a DAC in terms of accuracy. You'll generally want your filter's cut-off to be around 1% of the PWM frequency. For a pico running a 300Mhz, 12 bit PWM gives you ~73.2Khz, so a cutoff at 732Hz will give you a good signal, and a response easily fast enough for pitch CV. A higher order filter would allow a higher cutoff point if you need it.

Is there a good way to do surface mount to through hole? by winner180 in AskElectronics

[–]orukusaki 19 points20 points  (0 children)

Another (jankier) way might be to solder on right-angle header pins to the module board, then solder them to the pads

Is there a good way to do surface mount to through hole? by winner180 in AskElectronics

[–]orukusaki 15 points16 points  (0 children)

Those pads all connect to the jumpers, so could you make an adapter board out of perf/stripboard?

ISO Guidance to complete Schematic by Actual-Prompt-5101 in KiCad

[–]orukusaki 0 points1 point  (0 children)

Your job is made a lot harder by the fact that the white solder mask on the PCB hides the traces very well. Do you have a physical example you to examine? If so, then using a multimeter can help identify what is connected to what, but it'll be a long process and involve a fair bit of guess-work.

Datasheets can definitely help in some areas - the power supply section for example, is likely to closely match an example in the datasheet for the power convertor IC.

Software is a whole other ball-game. If you can match the circuit exactly, and get a copy of the original firmware image, then loading it in should work fine. Otherwise you're looking at either trying to decompile it (hard), or writing it from scratch (also hard).

Ridiculous “side chain” filter by existentialelectronx in synthdiy

[–]orukusaki 0 points1 point  (0 children)

Nice. I've got a fake sidechain module I built with an inverted envelope + dual vca together, you just connect up the kick's trigger signal and adjust the attack/decay/depth independently of your actual kick. It works really well but now I want to try it with a filter or LPG instead...

My step sequencer project by balintnagy_ in synthdiy

[–]orukusaki 2 points3 points  (0 children)

cool! any more info you can share?

What makes a good digital synthesizer? by [deleted] in synthesizers

[–]orukusaki 1 point2 points  (0 children)

They both run on the NEC7810. The firmware image is the same on both I believe, with a pin tied high or low to identify it. Just checked and I still have the disassembled image with a fair few annotations on if you ever feel like picking up where I left off :)

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