4 layers19 × 100 mm
4 layers19 × 100 mm
Mixer
xdylanm/mix-threeSimple 3 channel mixer in 4HP
- Size
- 19 × 100 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 45
- Nets
- 33
- Pads
- 120
- Tracks, vias
- 164, 14
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 17 Oct 2026
- Updated
- 17 Oct 2026
Overview
Mixer is an open-source printed circuit board by xdylanm, from the xdylanm/mix-three repository on GitHub, published under the MIT licence. It is a 4-layer board of 19 × 100 mm with 45 parts on 33 nets, routed with 164 tracks and 14 vias.
It is built around the TL072, 1N4148W and B140-E3, with the BC847 among its other parts. Its parts include 16 resistors, 9 capacitors, 6 diodes, 6 connectors and 2 transistors. It belongs with the audio and music boards of this library.
Main components
4
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
1N4148W
SOD-123150mA 1A 1V@50mA 1uA@75V 400mW 4ns 75V Independent SOD-123 Switching Diodes ROHSSTMicroelectronicsSwitching Diodes
B140-E3
SMA(DO-214AC)-65℃~+150℃ 1 Independent 1A 200uA@40V 30A 40V 520mV@1A SMA(DO-214AC) Schottky Diodes ROHSVishay IntertechnologySchottky Diodes
BC847
SOT-231 NPN 100MHz 100mA 100nA 110 200mW 45V 500mV 6V NPN SOT-23 Bipolar (BJT) ROHSShikuesBipolar (BJT)
README
README.mdMix 3
A simple 3 channel mixer for Eurorack.
Parts
45| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 220k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3, R4, R6, R7 |
| 4 | 100n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C4 |
| 4 | 1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R8, R9, R10 |
| 3 | 100k | Audio_Potentiometer_THT:Potentiometer_Bourns_PTV09A-1_Single_Vertical_thin | RV1, RV2, RV3 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R15, R16 |
| 2 | 10p | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C7, C8 |
| 2 | 10u | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C5, C6 |
| 2 | 1N4148W | Diode_SMD:D_SOD-123 | D3, D4 |
| 2 | 22k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R13, R14 |
| 2 | B140-E3 | Diode_SMD:D_SMA | D1, D2 |
| 2 | BC847 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 2 | FerriteBead_Small | Inductor_SMD:L_0805_2012Metric_Pad1.05x1.20mm_HandSolder | FB1, FB2 |
| 1 | 100k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R11 |
| 1 | 1u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C9 |
| 1 | 3mm LED Green | LED_THT:LED_D3.0mm_Clear | D6 |
| 1 | 3mm LED Red | LED_THT:LED_D3.0mm_Clear | D5 |
| 1 | 47k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R12 |
| 1 | A | AudioJacks:Jack_3.5mm_QingPu_WQP-PJ301M-12_Vertical_Slim | J2 |
| 1 | B | AudioJacks:Jack_3.5mm_QingPu_WQP-PJ301M-12_Vertical_Slim | J3 |
| 1 | C | AudioJacks:Jack_3.5mm_QingPu_WQP-PJ301M-12_Vertical_Slim | J4 |
| 1 | Conn_02x05_Odd_Even | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | J1 |
| 1 | INV_OUT | AudioJacks:Jack_3.5mm_QingPu_WQP-PJ301M-12_Vertical_Slim | J5 |
| 1 | OUT | AudioJacks:Jack_3.5mm_QingPu_WQP-PJ301M-12_Vertical_Slim | J6 |
| 1 | TL072 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
Questions
How big is the Mixer PCB?
It measures 19 × 100 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Mixer use?
45 parts, built around the TL072, 1N4148W, B140-E3 and BC847. 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 xdylanm/mix-three repository on GitHub, at the commit this page was made from: the board is hardware/mixer/mixer.kicad_pcb and its schematic hardware/mixer/mixer.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 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).
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