Mini-4ch mixer
About the Mini-4ch mixer PCB
Mini-4ch mixer is an open source PCB design by ArrestedLightning, published on GitHub under the CC-BY-4.0 license. It is a 2-layer board measuring 81.9 × 64 mm, with 80 components from 19 distinct parts.
Other key parts include the LM27762 and TL072. By type, the board carries 39 resistors, 19 capacitors, 6 connectors, 3 inductors, 2 ICs and 2 diodes.
It belongs with the audio designs in this gallery.
From the project
Design files for a simple 4-channel stereo audio mixer.
A very simple active audio mixer with 4 3.5mm inputs, and 1 3.5mm output. USB-powered. The default gain is 1:1 on all channels, although this can be changed by altering resistor values and/or installing potentiometers. I built this as a simple way to run multiple sources into a set of computer speakers. It is designed to fit in a commonly-available 90x70x28mm enclosure with end panels that can be either laser-cut or made from PCBs.
Main components on the Mini-4ch mixer
Mini-4ch mixer bill of materials (BOM)
80 components, 19 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LM27762 | WSON-12-1EP_3x2mm_P0.5mm_EP1x2.65_ThermalVias | U1 |
| 1 | TL072 | SO-8_3.9x4.9mm_P1.27mm | U2 |
| 5 | AudioJack3 | 3.5mmAudioJack | J1, J2, J3, J4, J6 |
| 1 | USB_B_Micro | USB_Micro_A_SMD_HANDSOLDER_SMALLPADS | J5 |
| 8 | R_POT | potentiometer_3x5mm | RV1, RV2, RV3, RV4, RV5, RV6, RV7, RV8 |
| 1 | SW_SPDT | PinHeader_1x03_P2.54mm_Horizontal | SW1 |
| 1 | C2293 Blue | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1 |
| 1 | C34499 White | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D2 |
| 3 | C1017 Ferrite_Bead_Small | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | FB1, FB2, FB3 |
| 3 | 0.1UF 0.1uF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1, C2, C14 |
| 13 | 10UF 10uF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C3, C4, C5, C7, C8, C9, C11, C12 +5 |
| 3 | 1UF 1uF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C6, C10, C15 |
| 12 | 0-DNP | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R1, R2, R30, R31, R32, R33, R34, R35 +4 |
| 2 | 82K | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R3, R6 |
| 2 | 220K | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R4, R5 |
| 9 | 0 | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R7, R8, R9, R10, R11, R12, R13, R14 +1 |
| 10 | 10K | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R15, R16, R17, R18, R19, R20, R21, R22 +2 |
| 2 | 100 | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R25, R26 |
| 2 | 4.7K | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R27, R28 |
Mini-4ch mixer design files
The KiCad project lives in the ArrestedLightning/mini-4ch-mixer repository on GitHub; these links point at the commit this page was built from.
Mini-4ch mixer: common questions
How big is the Mini-4ch mixer PCB?
The Mini-4ch mixer measures 81.9 × 64 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Mini-4ch mixer?
80 components, from 19 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Mini-4ch mixer design files?
From the ArrestedLightning/mini-4ch-mixer repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Mini-4ch mixer design in my own project?
Yes, under the terms of its CC-BY-4.0 license, which ArrestedLightning chose for the repository.
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