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4 layers95.5 × 101.6 mmBasschorus, the printed circuit board in 3D

Basschorus

rabidaudio/effects

Effects pedals and stomboxes

Full screenGitHub.kicad_pcb
Size
95.5 × 101.6 mm
Copper layers
4
Thickness
1.6 mm
Parts
159
Nets
83
Pads
372
Tracks, vias
536, 22
Pours
1
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
24 Apr 2022
Updated
3 Nov 2026

Overview

Basschorus is an open-source printed circuit board by rabidaudio, from the rabidaudio/effects repository on GitHub. It is a 4-layer board of 95.5 × 101.6 mm with 159 parts on 83 nets, routed with 536 tracks and 22 vias.

It is built around the ATTINY25-20SH and MAX1044ESA+. Its parts include 47 resistors, 36 capacitors, 10 ICs, 4 diodes and 4 connectors. It belongs with the AVR (ATmega, ATtiny) boards of this library.

Main components

2

README

README.md

Custom effects pedals

Homemade guitar/bass effects pedals.

License

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

Creative Commons License

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

Any source code is licensed under MIT.

Notes

text
jacks: neutrik from shared effects lib
capacitors: Capacitor_THT:C_Rect_L7.0mm_W2.5mm_P5.00mm
resistors (flush): Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal
alpha 9mm pots: Potentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical

CASE:
outer dims: 120x65 mm
wall depth: 2 mm
usable inner space: 102x60 mm
screw area: 8.6x8.6 mm

center point: 160.02 x 101.6 mm

pots minimum 12mm from top
stomp switch ~34mm from bottom

Parts

159
QtyValueFootprintReferences
14100nCapacitor_THT:C_Rect_L7.0mm_W2.5mm_P5.00mmC1, C2, C3, C5, C7, C10, C11, C12, C14, C17, C19, C20, C35, C36
6100kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR2, R3, R5, R8, R11, R27
4100KResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR37, R38, R39, R40
410uCapacitor_THT:CP_Radial_D8.0mm_P5.00mmC4, C6, C8, C9
31.1kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR12, R13, R22
3150nCapacitor_THT:C_Rect_L7.0mm_W2.5mm_P5.00mmC21, C29, C30
31KResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR33, R34, R35
31kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR4, R16, R44
31nCapacitor_THT:C_Rect_L7.0mm_W2.5mm_P5.00mmC13, C16, C25
3220Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR7, R14, R15
3R_TRIM_10KPotentiometer_THT:Potentiometer_Vishay_T73YP_VerticalRV6, RV7, RV10
3TL074Package_SO:SO-14_3.9x8.65mm_P1.27mmU1, U2, U3
21.5nCapacitor_THT:C_Rect_L7.0mm_W2.5mm_P5.00mmC26, C27
210kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR43, R46
21uCapacitor_THT:C_Rect_L7.0mm_W2.5mm_P5.00mmC24, C33
2220kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR9, R10
23.3uCapacitor_THT:CP_Radial_D8.0mm_P5.00mmC15, C18
233kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR31, R45
239kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR29, R30
248kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR42, R47
250kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR20, R21
256kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR24, R26
2D_SchottkyDiode_THT:D_DO-34_SOD68_P7.62mm_HorizontalD3, D4
2GNDTestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP23, TP24
2LEDLED_THT:LED_Rectangular_W5.0mm_H2.0mmD1, D2
2LM317_TO-220Package_TO_SOT_THT:TO-220-3_VerticalU4, U6
2R_TRIM_50KPotentiometer_THT:Potentiometer_Vishay_T73YP_VerticalRV8, RV11
2~Package_SO:SOP-8_3.76x4.96mm_P1.27mmU9, U10
1+7.5VTestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP21
1-7.5VTestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP22
1100Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR17
1100pCapacitor_THT:C_Rect_L7.0mm_W2.5mm_P5.00mmC28
110nCapacitor_THT:C_Rect_L7.0mm_W2.5mm_P5.00mmC31
1110kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR25
1120kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR32
112kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR19
122pCapacitor_THT:C_Rect_L7.0mm_W2.5mm_P5.00mmC23
122uCapacitor_THT:CP_Radial_D8.0mm_P5.00mmC34
1330kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR1
14.7nCapacitor_THT:C_Rect_L7.0mm_W2.5mm_P5.00mmC32
14.8kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR41
143kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR28
15.6kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR36
151kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR23
15VTestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP19
16.8nCapacitor_THT:C_Rect_L7.0mm_W2.5mm_P5.00mmC22
1680Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR6
191kResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_VerticalR18
19VTestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP20
1AATestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP12
1ATtiny25-20SPackage_DIP:DIP-8_W7.62mmU8
1AVR-ISP-6Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_VerticalJ4
1B100K_DEPTHPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV3
1B100K_WIDTHPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV4
1BBD1TestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP14
1BBD2TestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP15
1CGAINTestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP7
1CINTestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP8
1CLKTestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP13
1COMPTestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP11
1COUTTestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP9
1DCTestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP1
1ENVTestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP10
1FLANGETestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP17
1INTestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP2
1IN_project:JackHeadersJ1
1Jack-DCConnector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_VerticalJ2
1LM337_TO220Package_TO_SOT_THT:TO-220-3_VerticalU7
1MAX1044Package_DIP:DIP-8_W7.62mmU5
1OUT_project:JackHeadersJ3
1OUTTestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP18
1RFTestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP16
1R_COMP_A100KPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV9
1R_CUTOFF_A100KPotentiometer_THT:Potentiometer_Alpha_RD902F-40-00D_Dual_Vertical_CircularHolesRV12
1R_FLANGE_B1MPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV1
1R_TRIM_100kPotentiometer_THT:Potentiometer_Vishay_T73YP_VerticalRV2
1R_TRIM_5KPotentiometer_THT:Potentiometer_Vishay_T73YP_VerticalRV5
1SUMTestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP3
1SW_3PDT_x3Connector_PinHeader_2.54mm:PinHeader_1x09_P2.54mm_VerticalSW1
1TONEDTestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mmTP6

The 136 most common of 159 parts.

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Questions

How big is the Basschorus PCB?

It measures 95.5 × 101.6 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Basschorus use?

159 parts, built around the ATTINY25-20SH and MAX1044ESA+. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Basschorus KiCad files?

From the rabidaudio/effects repository on GitHub, at the commit this page was made from: the board is chorus2/basschorus/basschorus.kicad_pcb and its schematic ab-pedal/ab-pedal.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Basschorus design in my own project?

Its repository states no licence, so its author keeps all rights: ask rabidaudio before reusing the design.