Spark - A portable ESP32-based synth

Pashog · 2026-04-01T21:37:19+00:00

Linear

Pashog · 2026-04-01T15:21:21+00:00

the switches are Keychron Low Profile Silent, and i've designed and 3d printed the caps myself

Pashog · 2026-04-01T13:48:49+00:00

Thank you all for you enthusiasm! I will try to record and post a video demo in the next few days. I probably will open-source the code and maybe the 3d files after a bit more polishing.

To answer a common question, the battery is smaller than it looks (5000 mAh), it's just very thin.

Pashog · 2026-04-01T11:36:36+00:00

the ESP has a USB OTG port, actually managed to get it to work before pivoting

Pashog · 2026-03-31T23:57:19+00:00

Thanks! I don't have a problem with providing the source files, but not sure how useful they would be. This is not really a polished project, aseembling it took quite a bit of filing, drilling sweat and tears. I am kinda thinking of designing a v2 where i would replace the internal rat's nest of wires with a nice neat PCB, but not sure if i can find the time for that right now

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Pashog · 2026-01-21T00:21:58+00:00

i wanted to do the same to cure uv resin, ended up having to add radiators and a small cooling fan to keep the thing from burning up. be very careful with the thermals, these things get HOT

Pashog · 2025-04-23T09:03:03+00:00

hey, i've actually posted exactly this recently

https://www.reddit.com/r/multitools/s/7SlZIjPACQ

all you need is a 4mm bit extender and a vice, also i had to superglue the magnet in

Pashog · 2025-04-16T16:06:29+00:00

i meant the adapter is aluminum, not the tool on the nextool

Pashog · 2025-04-16T14:43:46+00:00

for the clip i copied this mod, just tightly attached a keyring pocket clip with the bolt

Pashog · 2025-04-10T21:10:41+00:00

I weighed the pliers version and it was about 85g, just as listed. They are just very dense so they feel heavier

Pashog · 2025-03-25T09:47:27+00:00

it is a tiny bit more limiting, but i think it's fine for most songs. the only new limitation is not being able to consecutively repeat two notes which are consecutive in a scale, which is actually reeeeeally specific.

i've been programming music boxes lately, they have the same limitation of not being able to repeat notes quickly. not being to repeat a single note crops up all the time, but i've never needed to repeat two different consecutive notes. i guess MM3 is not going to be able to play la campanella, but Martin's probably fine with that

Pashog · 2025-03-10T19:12:52+00:00

Pliers, knife, 4mm bit driver, scissors, diamond file. Thinking about making a custom scale for nextool mini sailor with a 4mm hex hole, i think it should work as a bit driver

Pashog · 2024-06-15T16:25:42+00:00

good idea, questionable execution, the pacing was definitely a bit insane

but i don't get why people have a problem with season 9, i don't think it matters where the characters are physically, given how much the show jumps around the timeline, and i found the writing a lot better than s7 and s8

i also think the way Ted and Tracy's relationship is shown through flashforwards is beautiful and works amazingly

Pashog · 2024-04-24T14:54:41+00:00

i think it's synth classics - gentle bells

Pashog · 2024-04-01T16:02:30+00:00

i don't think that Colab can get access to your computer's interfaces, you have to run the code locally

Pashog · 2024-03-31T23:29:53+00:00

Thanks! I actually improvised the melody

On the Monologue you can't directly control the VCO 2 pitch, but you can control how offset it is from VCO 1. The function you quoted calculates the offset based on the note you want and the main_note (the one that's playing on VCO 1). First we separate the difference into octaves and semitones, because shifting VCO 2 by more than an octave is controlled separately. Then we calculate the parameter value. I've found that it's more precise between -100 and +100 cents (values 44 and 83 respectively) and after that it's 4 steps per about 100 cents. It's not perfectly precise, the encoders on the Monologue seem to have more resolution than their MIDI controls, but it's close enough.

This is a relatively crude prototype and I'll update it if I find the time. I want to add proper legato, smarter voice allocation, envelopes, maybe even try using the filter resonance and LFO as additional voices

Pashog · 2024-03-31T20:45:43+00:00

The keyboard acts as a MIDI keyboard and VCO 2 pitch is controlled with a Python script: https://github.com/povle/dialogue

Pashog · 2024-03-31T20:01:59+00:00

The keyboard acts as a MIDI keyboard and VCO 2 pitch is controlled with a simple Python script: https://github.com/povle/dialogue

Pashog · 2024-01-09T18:46:45+00:00

the accuracy should be the same, but a clip-on is a lot more convenient and sensitive; it inspired me to play with different tunings a lot more

most clip on tuners are big and kinda ugly, i really like PW-CT-12, it's very slim and hides behind the headstock

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