2 layers214.2 × 167.2 mm Audio mixer, the printed circuit board in 3D

Audio mixer

Size: 214.2 × 167.2 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 100
Nets: 92
Pads: 264
Tracks, vias: 387, 0
Routed: Yes
KiCad: KiCad 10.0 (file 20260206)
Created: 22 Nov 2025
Updated: 7 Nov 2026

Overview

Audio mixer is an open-source printed circuit board by gridbugs, from the gridbugs/modular2 repository on GitHub, published under the MIT licence. It is a 2-layer board of 214.2 × 167.2 mm with 100 parts on 92 nets, routed with 387 tracks and 0 vias.

Its parts include 31 connectors, 18 resistors, 13 switches, 12 capacitors and 1 IC. It belongs with the audio and music boards of this library.

README

low-pass-filter/README.md

Low-pass Filter

Quirks

V1

The "Cutoff" potentiometer is reversed.

Parts

100

Qty	Value	Footprint	References
14	100K	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R1, R2, R3, R4, R5, R7, R8, R10, R11, R12, R15, R16, R17, R18
10	10uF	Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm	C1, C2, C3, C4, C6, C7, C9, C10, C11, C12
4	1K	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R6, R9, R13, R14
3	Power	Connector_IDC:IDC-Header_2x03_P2.54mm_Vertical	J2, J3, J4
2	100nF	Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm	C5, C8
2	Input A1	modular2:banana-jack	J1, J14
2	Input A2	modular2:banana-jack	J6, J16
2	Input A3	modular2:banana-jack	J8, J18
2	Input A4	modular2:banana-jack	J24, J26
2	Input A5	modular2:banana-jack	J25, J27
2	Input B1	modular2:banana-jack	J5, J15
2	Input B2	modular2:banana-jack	J7, J17
2	Input B3	modular2:banana-jack	J9, J19
2	Input B4	modular2:banana-jack	J28, J30
2	Input B5	modular2:banana-jack	J29, J31
2	Output A	modular2:banana-jack	J10, J20
2	Output B	modular2:banana-jack	J11, J21
1	100K - A	modular2:Potentiometer_Alps_RK09K_Single_Vertical - knob padding	RV7
1	100K - A1	modular2:Potentiometer_Alps_RK09K_Single_Vertical - knob padding	RV1
1	100K - A2	modular2:Potentiometer_Alps_RK09K_Single_Vertical - knob padding	RV4
1	100K - A3	modular2:Potentiometer_Alps_RK09K_Single_Vertical - knob padding	RV3
1	100K - A4	modular2:Potentiometer_Alps_RK09K_Single_Vertical - knob padding	RV9
1	100K - A5	modular2:Potentiometer_Alps_RK09K_Single_Vertical - knob padding	RV10
1	100K - B	modular2:Potentiometer_Alps_RK09K_Single_Vertical - knob padding	RV8
1	100K - B1	modular2:Potentiometer_Alps_RK09K_Single_Vertical - knob padding	RV2
1	100K - B2	modular2:Potentiometer_Alps_RK09K_Single_Vertical - knob padding	RV6
1	100K - B3	modular2:Potentiometer_Alps_RK09K_Single_Vertical - knob padding	RV5
1	100K - B4	modular2:Potentiometer_Alps_RK09K_Single_Vertical - knob padding	RV11
1	100K - B5	modular2:Potentiometer_Alps_RK09K_Single_Vertical - knob padding	RV12
1	AudioJack4	modular2:audio jack breakout	J13
1	Conn_01x03_Pin	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical	J23
1	Conn_01x15_Pin	Connector_PinHeader_2.54mm:PinHeader_1x15_P2.54mm_Vertical	J22
1	Conn_01x15_Socket	Connector_PinSocket_2.54mm:PinSocket_1x15_P2.54mm_Vertical	J12
1	Iso A	modular2:switch1	SW7
1	Iso A1	modular2:switch1	SW1
1	Iso A2	modular2:switch1	SW3
1	Iso A3	modular2:switch1	SW5
1	Iso A4	modular2:switch1	SW10
1	Iso A5	modular2:switch1	SW11
1	Iso B	modular2:switch1	SW8
1	Iso B1	modular2:switch1	SW2
1	Iso B2	modular2:switch1	SW4
1	Iso B3	modular2:switch1	SW6
1	Iso B4	modular2:switch1	SW12
1	Iso B5	modular2:switch1	SW13
1	LOGO	modular2:ibis-small	G***
1	Mono/Stereo	modular2:switch1	SW9
1	TL074	Package_DIP:DIP-14_W7.62mm_Socket	U1

The 88 most common of 100 parts.

Questions

How big is the Audio mixer PCB?

It measures 214.2 × 167.2 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Audio mixer use?

100 parts. 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 Audio mixer KiCad files?

From the gridbugs/modular2 repository on GitHub, at the commit this page was made from: the board is audio-mixer/audio-mixer.kicad_pcb and its schematic arduino-delay/arduino-delay.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Audio mixer design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Category and platform

Audio and music

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/gridbugs-modular2-audio-mixer" title="Audio mixer in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/gridbugs-modular2-audio-mixer.jpg" alt="Audio mixer" width="1200" height="900">

A picture that opens the board, for a README

[![Audio mixer](https://pcbkit.io/embed/boards/gridbugs-modular2-audio-mixer.jpg?size=s)](https://pcbkit.io/boards/gridbugs-modular2-audio-mixer)

Source

Repository: gridbugs/modular2
Board file: audio-mixer/audio-mixer.kicad_pcb
Commit: 81bdd24
Licence: MIT

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