HardLabs

Chorus

rabidaudio·effects·chorus/chorus/chorus.kicad_pcb

Chorus PCB layout, top view — open source AVR/Arduino board by rabidaudio

About the Chorus PCB

Chorus is an open source AVR/Arduino PCB design by rabidaudio, published on GitHub. It is a 2-layer board measuring 54.6 × 95.3 mm, with 70 components from 45 distinct parts.

Its main chip is the ATTINY85-20PU, from the AVR/Arduino family. Other key parts include the LM13700, TL074, LM7805, TL072 and MN3207. By type, the board carries 35 resistors, 12 capacitors, 11 ICs, 4 connectors, 2 diodes and 1 switch.

From the project

Effects pedals and stomboxes

Schematics, board layouts, documentation, etc. is licensed under Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

If you're interested in commercial use, please ask first.

Chorus, from the project README
From the project README

Main components on the Chorus

LM13700TL074LM7805TL072MN3207TLE2426xLPATTINY85-20PUMN3102

Chorus bill of materials (BOM)

70 components, 45 distinct parts.

QtyPartRefs
1
LM13700
U1
3
TL074
U2, U3, U4
1
LM7805
U5
2
TL072
U6, U11
1
MN3207
U7
1
TLE2426xLP
U8
1
ATTINY85-20PU
Microchip Technology
U9
1
MN3102
U10
1
IN
J1
1
ISP
J2
1
Jack-DC
J3
1
OUT
J4
1
R_TRIM_10K
RV1
1
100K
R_CUTOFF_1
2
100K
R_DEPTH1, R_RATE1
1
1M
R_FLANGE1
1
SW_3PDT_x3
SW1
2
LED
D1, D2
1
100n
C1
1
220n
C2
Show 25 more
QtyPartRefs
1
470p
C3
2
6.8n
C4, C7
2
330p
C5, C8
2
2.2n
C6, C9
1
3.3u
C10
2
33n
C11, C12
6
1M
R1, R2, R3, R4, R6, R7
1
100
R5
1
240
R8
1
4.8k
R9
1
2.7k
R10
1
2.2k
R11
4
1K
R12, R24, R25, R27
1
220
R13
2
11k
R14, R17
1
150k
R15
1
47k
R16
1
75K
R18
1
51K
R19
6
100K
R20, R21, R29, R30, R31, R32
3
5.6K
R22, R23, R28
1
500K
R26
1
330
R33
1
91K
R34
1
30K
R35

Chorus design files

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

Chorus: common questions

What microcontroller does the Chorus use?

The Chorus is built around the ATTINY85-20PU, from the AVR/Arduino family.

How big is the Chorus PCB?

The Chorus measures 54.6 × 95.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Chorus?

70 components, from 45 distinct parts. The full bill of materials is listed on this page.

Where can I download the Chorus design files?

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

Can I use the Chorus design in my own project?

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

Can I test firmware for the Chorus without the hardware?

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

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