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Bit Crusher Pedal

JordanAceto·horrible_distortion·hardware/main_pcb/kicad_docs/bit_crusher_pedal.kicad_pcb

Bit Crusher Pedal PCB layout, top view — open source STM32 board by JordanAceto

About the Bit Crusher Pedal PCB

Bit Crusher Pedal is an open source STM32 PCB design by JordanAceto, published on GitHub. It is a 2-layer board measuring 81.3 × 61 mm, with 94 components from 43 distinct parts.

Its main chip is the STM32F334K6Tx, from the STM32 family. Other key parts include the MCP6002-xP, AMS1117-3.3 and NE570. By type, the board carries 37 capacitors, 34 resistors, 7 connectors, 5 ICs, 2 diodes and 2 inductors.

It belongs with the audio designs in this gallery.

From the project

stm32 based bit-crusher and sample-rate-reducer pedal

The audio signal is immediately buffered by a FET source-follower which provides a high impedance input as expected by guitars and other musical instruments.

The signal is then compressed by 1/2 of an NE570 compandor chip configured as a compressor. This compression squishes the audio signal into a reduced range so that both quiet and loud signals take up enough ADC resolution for the algorithm to work with.

Bit Crusher Pedal, from the project README
From the project README

Main components on the Bit Crusher Pedal

MCP6002-xPSTM32F334K6TxAMS1117-3.3NE570

Bit Crusher Pedal bill of materials (BOM)

94 components, 43 distinct parts.

QtyPartRefs
2
MCP6002-xP
U1, U2
1
STM32F334K6Tx
U3
1
AMS1117-3.3
U4
1
NE570
U5
1
MMBF5457
Q1
1
8MHz
X1
1
audio_input
J1
1
audio_output
J2
1
SWD_header
J3
1
9v_DC_in
J4
1
extern_resolution_CV
J5
1
extern_sample_rate_CV
J6
1
to_LED
J7
1
100k
RV1
2
10k
RV2, RV3
2
100k
RV4, RV5
1
rg_clipping_LED
D1
1
B5819W
D2
2
100R @ 100MHz
FB1, FB2
2
20pF
C1, C2
Show 23 more
QtyPartRefs
14
100nF
C3, C5, C10, C12, C14, C15, C16, C18 +6
4
220nF
C4, C27, C30, C32
2
1nF
C6, C7
1
470nF
C8
1
4.7uF
C9
1
1uF
C11
4
10nF
C13, C24, C26, C37
5
10uF
C17, C20, C29, C33, C35
2
220pF
C28, C31
1
2.2uF
C34
1
390
R1
3
330
R2, R3, R23
7
10k
R4, R6, R11, R15, R19, R30, R34
1
2k2
R5
4
1k8
R7, R8, R13, R14
2
8k2
R9, R10
5
2M2
R12, R28, R31, R32, R33
2
100k
R16, R20
4
68k
R17, R18, R21, R22
1
opt
R24
1
560
R25
1
1M
R26
2
22k
R27, R29

Bit Crusher Pedal design files

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

Bit Crusher Pedal: common questions

What microcontroller does the Bit Crusher Pedal use?

The Bit Crusher Pedal is built around the STM32F334K6Tx, from the STM32 family.

How big is the Bit Crusher Pedal PCB?

The Bit Crusher Pedal measures 81.3 × 61 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Bit Crusher Pedal?

94 components, from 43 distinct parts. The full bill of materials is listed on this page.

Where can I download the Bit Crusher Pedal design files?

From the JordanAceto/horrible_distortion repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Bit Crusher Pedal design in my own project?

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

Can I test firmware for the Bit Crusher Pedal 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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