2 layers50 × 100 mm
2 layers30 × 100 mm
A modular synth project
- Size
- 30 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 24
- Nets
- 14
- Pads
- 62
- Tracks, vias
- 77, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 25 Apr 2025
- Updated
- 31 Mar 2026
Overview
Mixer 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 30 × 100 mm with 24 parts on 14 nets, routed with 77 tracks and 0 vias.
It is built around the TL072 and BC547. Its parts include 8 resistors, 5 connectors, 3 capacitors, 1 IC and 1 transistor. It belongs with the audio and music boards of this library.
Main components
2README
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
24| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100k | HackSynth:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3, R4 |
| 2 | 100k | HackSynth:Potentiometer_Alps_RK09K_Horizontal | RV1, RV2 |
| 2 | Conn_01x03 | HackSynth:JST_PH_S3B-PH-K_1x03_P2.00mm_Horizontal | J5, J6 |
| 1 | 100k NOISE | HackSynth:Potentiometer_Alps_RK09K_Horizontal | RV3 |
| 1 | 100nF | HackSynth:C_Disc_D5.0mm_W2.5mm_P5.00mm | C2 |
| 1 | 10k | HackSynth:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8 |
| 1 | 10pF | HackSynth:C_Disc_D5.0mm_W2.5mm_P5.00mm | C3 |
| 1 | 130k | HackSynth:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5 |
| 1 | 2M | HackSynth:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6 |
| 1 | 470k | HackSynth:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7 |
| 1 | BC547 | HackSynth:TO-92_Inline - BC547 - 2-Pin Handsolder | Q1 |
| 1 | C | HackSynth:C_Disc_D5.0mm_W2.5mm_P5.00mm | C1 |
| 1 | IN_1 | HackSynth:Jack_3.5mm | J1 |
| 1 | IN_2 | HackSynth:Jack_3.5mm | J2 |
| 1 | OUT | HackSynth:Jack_3.5mm | J3 |
| 1 | TL072 | HackSynth:DIP-8_W7.62mm_LongPads | U1 |
| 1 | Val** | HackSynth:PancakeLegend Logo - 10mm | Ref** |
| 1 | Val** | HackSynth:CCHS Logo - 10mm | Ref** |
The 23 most common of 24 parts.
Questions
How big is the Mixer PCB?
It measures 30 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Mixer use?
24 parts, built around the TL072 and BC547. 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 Mixer KiCad files?
From the PancakeLegend/HackSynth repository on GitHub, at the commit this page was made from: the board is KiCAD/Mixer/Mixer.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 Mixer 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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