2 layers50 × 100 mm
2 layers50 × 100 mm
Chorus
PancakeLegend/HackSynth2A modular synth project
- Size
- 50 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 89
- Nets
- 58
- Pads
- 222
- Tracks, vias
- 560, 32
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 25 Apr 2025
- Updated
- 31 Mar 2026
Overview
Chorus is an open-source printed circuit board by PancakeLegend, from the PancakeLegend/HackSynth repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 50 × 100 mm with 89 parts on 58 nets, routed with 560 tracks and 32 vias.
It is built around the PT2399, TL072 and L7805, with the BC337 among its other parts. Its parts include 34 resistors, 28 capacitors, 6 diodes, 5 ICs and 4 connectors.
Main components
4
PT2399
DIP-16Processor DIP-16 Audio Interface ICs ROHSPTCAudio Interface ICs
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
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BC337
TO-92-31 NPN 100 100MHz 100nA 45V 5V 625mW 700mV 800mA NPN TO-92-3 Bipolar (BJT) ROHSFoshan Blue Rocket ElecBipolar (BJT)
README
README.mdHackSynth
A MODULAR SYNTH PROJECT
PROJECT ORIGIN STORY
- WE DISCOVERED A VERY AWESOME BREADBOARD SYNTH PROJECT CALLED BS-1, BY SOMEONE CALLED MAXWELL BECK.
- WE DECIDED TO CREATE A MODULAR SYNTH BASED ON THIS PROJECT, BUT DESIGN PCBS RATHER THAN USING BREADBOARDS FOR EACH MODULE
WHAT IS THE PURPOSE OF THIS PROJECT?
WHAT'S THE VISION?
- A LOW COST WAY FOR ENTHUSIASTS TO BREAK INTO THE WORLD OF MODULAR SYNTHESIS
WHO ARE WE
- WE ARE MEMBERS AT THE CONNECTED COMMUNITY HACKERSPACE - A COMMUNITY FOR
Parts
89| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 100k | HackSynth:R_Vertical_P2.54mm | R1, R2, R3, R5, R11, R14, R15, R19, R23, R29 |
| 10 | 10k | HackSynth:R_Vertical_P2.54mm | R9, R12, R18, R21, R26, R27, R28, R30, R32, R33 |
| 5 | 1N4148 | HackSynth:D_Vertical_P2.54mm | D1, D2, D3, D4, D5 |
| 4 | 100nF | HackSynth:C_Ceramic_D4.5mm_P5.00mm | C15, C17, C20, C25 |
| 4 | 2.2nF | HackSynth:C_Ceramic_D4.5mm_P5.00mm | C5, C8, C14, C18 |
| 3 | 10k | HackSynth:Potentiometer_Alps_RK09K_Horizontal | RV1, RV2, RV4 |
| 3 | 10nF | HackSynth:C_Ceramic_D4.5mm_P5.00mm | C11, C19, C21 |
| 3 | 1µF | HackSynth:C_Ceramic_D4.5mm_P5.00mm | C12, C13, C22 |
| 3 | TL072 | HackSynth:DIP-8_W7.62mm_LongPads | U1, U2, U3 |
| 2 | 15k | HackSynth:R_Vertical_P2.54mm | R31, R34 |
| 2 | 1k | HackSynth:R_Vertical_P2.54mm | R7, R8 |
| 2 | 220pF | HackSynth:C_Ceramic_D4.5mm_P5.00mm | C4, C10 |
| 2 | 22k | HackSynth:R_Vertical_P2.54mm | R4, R6 |
| 2 | 33k | HackSynth:R_Vertical_P2.54mm | R10, R13 |
| 2 | 4.7k | HackSynth:R_Vertical_P2.54mm | R22, R24 |
| 2 | 47µF | HackSynth:CP_Radial_D5.2mm_P2.50mm_LayDown | C26, C28 |
| 2 | 56k | HackSynth:R_Vertical_P2.54mm | R16, R20 |
| 2 | 680pF | HackSynth:C_Ceramic_D4.5mm_P5.00mm | C6, C9 |
| 2 | 68pF | HackSynth:C_Ceramic_D4.5mm_P5.00mm | C2, C3 |
| 2 | BC337 | HackSynth:TO-92_Inline - Handsolder | Q1, Q2 |
| 2 | Conn_01x03 | HackSynth:JST_PH_S3B-PH-K_1x03_P2.00mm_Horizontal | J3, J4 |
| 1 | 10uF 25v | HackSynth:CP_Radial_D4.0mm_P1.50mm | C23 |
| 1 | 10µF | HackSynth:CP_Radial_D5.2mm_P2.50mm_LayDown_Mirror | C27 |
| 1 | 1M | HackSynth:Potentiometer_Alps_RK09K_Horizontal | RV3 |
| 1 | 1M | HackSynth:R_Vertical_P2.54mm | R17 |
| 1 | 1N4002 | HackSynth:D_A-405_P7.62mm_Horizontal | D6 |
| 1 | 1uF | HackSynth:CP_Radial_D4.0mm_P1.50mm | C7 |
| 1 | 1uF 50v | HackSynth:CP_Radial_D4.0mm_P1.50mm | C24 |
| 1 | 220R | HackSynth:R_Vertical_P2.54mm | R25 |
| 1 | 220nF | HackSynth:C_Ceramic_D4.5mm_P5.00mm | C1 |
| 1 | 2µ2 | HackSynth:C_Ceramic_D4.5mm_P5.00mm | C16 |
| 1 | IN | HackSynth:Jack_3.5mm | J1 |
| 1 | L7805 | HackSynth:L7805 - TO-220-3_Horizontal_TabDown | U5 |
| 1 | LOGO | HackSynth:Logo - PancakeLegend 10mm Invert | G*** |
| 1 | LOGO | HackSynth:Logo - Rabbit 02 | G*** |
| 1 | OUT | HackSynth:Jack_3.5mm | J2 |
| 1 | PT2399 | HackSynth:DIP-16_W7.62mm_LongPads | U4 |
| 1 | SW_SPDT | HackSynth:Switch SPDT - SMTS-102 | SW1 |
| 1 | ~ | HackSynth:Logo - PancakeLegend 10mm | G2 |
| 1 | ~ | HackSynth:Logo - CCHS 10mm | G1 |
The 88 most common of 89 parts.
Questions
How big is the Chorus PCB?
It measures 50 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Chorus use?
89 parts, built around the PT2399, TL072, L7805 and BC337. 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 PancakeLegend/HackSynth repository on GitHub, at the commit this page was made from: the board is KiCAD/Chorus/Chorus.kicad_pcb and its schematic KiCAD/ASDR/ASDR.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 publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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