4 layers95.5 × 101.6 mm
2 layers143.5 × 95.3 mm
Chorus
rabidaudio/effectsEffects pedals and stomboxes
- Size
- 143.5 × 95.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 70
- Nets
- 68
- Pads
- 257
- Tracks, vias
- 45, 1
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 24 Apr 2022
- Updated
- 3 Nov 2026
Overview
Chorus is an open-source printed circuit board by rabidaudio, from the rabidaudio/effects repository on GitHub. It is a 2-layer board of 143.5 × 95.3 mm with 70 parts on 68 nets, routed with 45 tracks and 1 via.
It is built around the ATTINY85-20PU, TL072 and LM13700M, with the LM7805 among its other parts. Its parts include 35 resistors, 12 capacitors, 11 ICs, 4 connectors and 2 diodes. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
4
ATTINY85-20PU
PDIP-8-40℃~+85℃ 10bit 2.7V~5.5V 20MHz 512Byte 512Byte 6 8 Bit 8KB AVR Built-in FLASH PDIP-8 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
TL072
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 10V/us 10mV 2 2.5nA 3MHz 85dB SOP-8 Operational Amplifier ROHSGcoreOperational Amplifier
LM13700M
SOIC-16-16V~-4.75V、4.75V~16V 0℃~+70℃ 110dB 2 2.6mA 20mA 400nA 4mV 50V/us 600nA 9.5V~32V SOIC-16 Operational Amplifier ROHSTexas InstrumentsOperational Amplifier
LM7805
TO-2630℃~+125℃ 1 1A 20V 2V 42uV 5V 62dB@(120Hz) 8mA Fixed Over Temperature Protection、Short Circuit Protection Positive TO-263 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSYONGYUTAIVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdCustom 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.
If you're interested in commercial use, please ask first.
Any source code is licensed under MIT.
Notes
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 bottomParts
70| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 100K | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R20, R21, R29, R30, R31, R32 |
| 6 | 1M | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R1, R2, R3, R4, R6, R7 |
| 4 | 1K | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R12, R24, R25, R27 |
| 3 | TL074 | kicad-legacy/kicad-footprints/Package_DIP.pretty:DIP-14_W7.62mm | U2, U3, U4 |
| 2 | 100K | kicad-legacy/kicad-footprints/Potentiometer_THT.pretty:Potentiometer_Alps_RK09K_Single_Vertical | R_DEPTH1, R_RATE1 |
| 2 | 11k | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R14, R17 |
| 2 | 2.2n | Capacitor_THT:C_Disc_D6.0mm_W2.5mm_P5.00mm | C6, C9 |
| 2 | 330p | Capacitor_THT:C_Disc_D6.0mm_W2.5mm_P5.00mm | C5, C8 |
| 2 | 33n | Capacitor_THT:C_Disc_D6.0mm_W2.5mm_P5.00mm | C11, C12 |
| 2 | 5.6K | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R22, R23 |
| 2 | 6.8n | Capacitor_THT:C_Disc_D6.0mm_W2.5mm_P5.00mm | C4, C7 |
| 2 | LED | kicad-official/LED_THT.pretty:LED_D3.0mm | D1, D2 |
| 2 | TL072 | kicad-legacy/Housings_DIP.pretty:DIP-8_W7.62mm | U6, U11 |
| 1 | 100 | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R5 |
| 1 | 100K | kicad-legacy/kicad-footprints/Potentiometer_THT.pretty:Potentiometer_Alps_RK09L_Double_Vertical | R_CUTOFF_1 |
| 1 | 100n | Capacitor_THT:C_Disc_D6.0mm_W2.5mm_P5.00mm | C1 |
| 1 | 150k | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R15 |
| 1 | 1M | kicad-legacy/kicad-footprints/Potentiometer_THT.pretty:Potentiometer_Alps_RK09K_Single_Vertical | R_FLANGE1 |
| 1 | 2.2k | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R11 |
| 1 | 2.7k | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R10 |
| 1 | 220 | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R13 |
| 1 | 220n | Capacitor_THT:C_Disc_D6.0mm_W2.5mm_P5.00mm | C2 |
| 1 | 240 | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R8 |
| 1 | 3.3u | Capacitor_THT:C_Disc_D6.0mm_W2.5mm_P5.00mm | C10 |
| 1 | 30K | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R35 |
| 1 | 330 | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R33 |
| 1 | 4.8k | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R9 |
| 1 | 470p | Capacitor_THT:C_Disc_D6.0mm_W2.5mm_P5.00mm | C3 |
| 1 | 47k | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R16 |
| 1 | 5.6k | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R28 |
| 1 | 500K | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R26 |
| 1 | 51K | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R19 |
| 1 | 75K | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R18 |
| 1 | 91K | kicad-legacy/kicad-footprints/Resistor_THT.pretty:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R34 |
| 1 | ATTINY85-20PU | kicad-legacy/Housings_DIP.pretty:DIP-8_W7.62mm | U9 |
| 1 | IN | kicad-legacy/kicad-footprints/Connector_Audio.pretty:Jack_6.35mm_Neutrik_NMJ6HCD2_Horizontal | J1 |
| 1 | ISP | kicad-official/Connector_PinSocket_2.54mm.pretty:PinSocket_2x03_P2.54mm_Vertical | J2 |
| 1 | Jack-DC | kicad-official/Connector_PinSocket_2.54mm.pretty:PinSocket_2x01_P2.54mm_Vertical | J3 |
| 1 | LM13700 | kicad-legacy/kicad-footprints/Package_DIP.pretty:DIP-16_W7.62mm | U1 |
| 1 | LM7805 | kicad-official/Package_TO_SOT_THT.pretty:TO-220F-3_Vertical | U5 |
| 1 | MN3102 | kicad-legacy/Housings_DIP.pretty:DIP-8_W7.62mm | U10 |
| 1 | MN3207 | kicad-legacy/Housings_DIP.pretty:DIP-8_W7.62mm | U7 |
| 1 | OUT | kicad-legacy/kicad-footprints/Connector_Audio.pretty:Jack_6.35mm_Neutrik_NMJ6HCD2_Horizontal | J4 |
| 1 | R_TRIM_10K | kicad-legacy/Potentiometers.pretty:Potentiometer_Trimmer_Bourns_3296W | RV1 |
| 1 | SW_3PDT_x3 | Button_Switch_THT:Stompbox Switch | SW1 |
| 1 | TLE2426xLP | kicad-legacy/TO_SOT_Packages_THT.pretty:TO-92_Inline_Wide | U8 |
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Questions
How big is the Chorus PCB?
It measures 143.5 × 95.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Chorus use?
70 parts, built around the ATTINY85-20PU, TL072, LM13700M and LM7805. 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 Chorus KiCad files?
From the rabidaudio/effects repository on GitHub, at the commit this page was made from: the board is chorus/chorus/chorus.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 Chorus design in my own project?
Its repository states no licence, so its author keeps all rights: ask rabidaudio before reusing the design.