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String-Drum-Synthesizer

AbhiN30·String-Drum-Synthesizer·Schematic/String-Drum-Synthesizer.kicad_pcb

String-Drum-Synthesizer PCB layout, top view — open source STM32 board by AbhiN30

About the String-Drum-Synthesizer PCB

String-Drum-Synthesizer is an open source STM32 PCB design by AbhiN30, published on GitHub. It is a 2-layer board measuring 86.8 × 90.8 mm, with 61 components from 24 distinct parts.

Its main chip is the STM32F722RCTx, from the STM32 family. Other key parts include the LM1117MP-3.3, SII1136CTU and LM3900DR. By type, the board carries 32 resistors, 11 capacitors and 5 ICs.

It belongs with the audio designs in this gallery.

From the project

Purpose/Requirements: This subsystem must be able to power the processor and the USB keyboard. Capacitors will be used to stabilize the power block.

Purpose/Requirements: This subsystem must be able to power the processor and the USB keyboard. Capacitors will be used to stabilize the power block.

- 5V DC Power Supply Adapter - Capacitors - Subsystem 2: Synthesizer

We made a demo of the synthesizer algorithm using a digital audio workstation in order to play with parameters and determine the names of the emotive knobs. Below are the emotive knobs and how the corresponding synth parameters should change to implement them:

Main components on the String-Drum-Synthesizer

LM1117MP-3.3SII1136CTULM3900DRSTM32F722RCTx

String-Drum-Synthesizer bill of materials (BOM)

61 components, 24 distinct parts.

QtyPartRefs
2
LM1117MP-3.3
U1, U5
1
SII1136CTU
U2
1
LM3900DR
U4
1
STM32F722RCTx
U6
1
74LS257
74LS257
1
Conn_01x03_Pin
AudioJack1
1
10029449-111RLF
HDMI_Port1
2
USB-A1HSW6
KeyboardUSBPort1, ProgrammableUSBPort1
8
EmotiveKnob
Pot0, Pot1, Pot2, Pot3, Pot4, Pot5, Pot6, Pot7
3
0.1uF
C1, C3, C5
4
10uF
C2, C4, C6, C7
1
0.01u
C8
1
2.2uF
C9
2
400pF
C11, C12
2
2k
R1, R12
1
3.3k
R2
12
220
R3, R4, R5, R7, R9, R17, R27, R28 +4
1
820
R6
4
4k7
R8, R18, R20, R22
5
10k
R10, R15, R19, R21, R23
Show 4 more
QtyPartRefs
1
1k
R11
1
750
R13
2
75k
R14, R16
3
1M
R24, R25, R26

String-Drum-Synthesizer design files

The KiCad project lives in the AbhiN30/String-Drum-Synthesizer repository on GitHub; these links point at the commit this page was built from.

String-Drum-Synthesizer: common questions

What microcontroller does the String-Drum-Synthesizer use?

The String-Drum-Synthesizer is built around the STM32F722RCTx, from the STM32 family.

How big is the String-Drum-Synthesizer PCB?

The String-Drum-Synthesizer measures 86.8 × 90.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the String-Drum-Synthesizer?

61 components, from 24 distinct parts. The full bill of materials is listed on this page.

Where can I download the String-Drum-Synthesizer design files?

From the AbhiN30/String-Drum-Synthesizer repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the String-Drum-Synthesizer design in my own project?

The repository has no license, so all rights stay with AbhiN30. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the String-Drum-Synthesizer without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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