Floyd Steinberg | This $20 synthesizer sounds very nice indeed @mr_floydst | Uploaded March 2024 | Updated October 2024, 1 hour ago.
BPSynth is a #diy monophonic #virtualanalog #synthesizer based on a STM32F411 "BlackPill" microcontroller created by @Synthetech . In this video, I show which parts you need, where to get them and how to assemble them, plus some sound impressions. Table of contents:

00:00 short demo
00:07 hi
00:30 parts needed
00:58 were to get and how to install the firmware
02:23 building the BPSynth
04:20 building the MIDI jack
06:50 important considerations
07:14 set up a MIDI controller
07:39 synth engine overview
08:07 demonstation track
11:14 conclusion

Resources
Firmware can be found on Blaines' YT channel: @Synthetech
BlackPill STM32F411 board (I bought the F411 25M HSE) de.aliexpress.com/item/1005001456186625.html
UDA 1334A DAC module de.aliexpress.com/item/1005004932558176.html
5pin midi socket de.aliexpress.com/item/33030129792.html
6N137 optocoupler de.aliexpress.com/item/1005004249645464.html
220 and a 10k ohm resistor de.aliexpress.com/item/1005004525936064.html
1N4148 diode de.aliexpress.com/item/1005004333197874.html
Jumper wires de.aliexpress.com/item/1005005990715944.html
Breadboard de.aliexpress.com/item/1005001456586666.html
Electronic component tester and identifier amazon.com/-/de/dp/B0BK95J4TV

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Here's what I have in my setup at the moment. Want to have that, too? Please use the followings links and support me:

Yamaha EX5 ebay.com/sch/i.html?_nkw=yamaha+ex5
Kasser Synths Arcade tindie.com/products/kassersynths/dafm-synth-arcade-ym2151
Intech GRID: https://intech.studio/
MPC One, Novation PEAK, Reface DX, Source Audio Collider, Strymon Iridium, Zoom MS 70 CDR, Donner N-25, Akai EWI USB, Zoom R20, Zoom H5, Yamaha MT7, Roland Aira:
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Some bands / artists I've been following for a long time are (among others) Massive Attack, Pink Floyd, Pet Shop Boys, Archive, A-Ha, Yes, Porcupine Tree, John Mellencamp, Jean-Michel Jarre, Metallica, Peter Gabriel and Perturbator. So my music will kind of sound like those (without ever reaching the greatness of those artists, of course). :-)