HardLabs

STM32CrapSynth

LTVA1·STM32CrapSynth·board/board.kicad_pcb

STM32CrapSynth PCB layout, top view — open source board by LTVA1

About the STM32CrapSynth PCB

STM32CrapSynth is an open source PCB design by LTVA1, published on GitHub under the MIT license. It is a 2-layer board measuring 92 × 75.8 mm, with 65 components from 17 distinct parts.

By type, the board carries 26 capacitors, 16 resistors, 14 ICs and 9 connectors.

It belongs with the audio designs in this gallery.

From the project

A crappy hardware synth using STM32F303 and 4 AD9833 waveform generators

A software/hardware synth based on STM32F303RE, 4xAD9833 wave generators, one MM5437 noise generator and LTC1063 lowpass filter. Currently I seem to have burned the filter so instead there's 3rd PCM channel using the timer that was planned for filter clocking.

Here's the demo. I recorded each channel separately for channel oscilloscopes and then recorded them all for master sound which you can hear in the video.

STM32CrapSynth, from the project README
From the project README

STM32CrapSynth bill of materials (BOM)

65 components, 17 distinct parts.

QtyPartRefs
4
~
U1, U2, U3, U4
2
~
U5, U6
2
~
U7, U14
4
~
U8, U9, U10, U12
1
~
U11
1
~
U13
2
~
J1, J2
2
Conn_01x01
J3, J4
1
PJ-320B
J5
3
Screw_Terminal_01x02
J6, J7, J8
1
~
J9
19
CGA3E2X5R1E224K080AA
0.22uF_0603_25V
TDK
C1, C2, C3, C5, C6, C7, C10, C11 +11
7
GRM219R61C226ME15K
22uF_0603_16V
Murata
C4, C8, C9, C13, C14, C18, C21
3
RC0603FR-07100KL
100k_0603
Yageo
R1, R2, R6
8
TNPW06033K00BEEA
3.0k_0603_0.1%
Vishay / Dale
R3, R4, R5, R7, R9, R11, R13, R16
1
RC0603FR-072K2L
2.2k_0603
Yageo
R8
4
ERA-3AEB102V
1k_0603_0.1%
Panasonic
R10, R12, R14, R15

STM32CrapSynth design files

The KiCad project lives in the LTVA1/STM32CrapSynth repository on GitHub; these links point at the commit this page was built from.

STM32CrapSynth: common questions

How big is the STM32CrapSynth PCB?

The STM32CrapSynth measures 92 × 75.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the STM32CrapSynth?

65 components, from 17 distinct parts. The full bill of materials is listed on this page.

Where can I download the STM32CrapSynth design files?

From the LTVA1/STM32CrapSynth repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the STM32CrapSynth design in my own project?

Yes, under the terms of its MIT license, which LTVA1 chose for the repository.

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