2 layers29.5 × 100 mm
Output b
xdylanm/modular-output
An audio output module for Eurorack, combining two mono input channels into a stereo output with a panning mixer. The stereo output is suitable to drive headphones or small speakers.
62 partsMIT
2 layers59.5 × 100 mm
Modular output
xdylanm/modular-outputAn audio output module for Eurorack, combining two mono input channels into a stereo output with a panning mixer. The stereo output is suitable to drive headphones or small speakers.
- Size
- 59.5 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 100
- Nets
- 78
- Pads
- 283
- Tracks, vias
- 471, 9
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 22 Feb 2025
- Updated
- 20 Oct 2026
Overview
Modular output is an open-source printed circuit board by xdylanm, from the xdylanm/modular-output repository on GitHub, published under the MIT licence. It is a 2-layer board of 59.5 × 100 mm with 100 parts on 78 nets, routed with 471 tracks and 9 vias.
It is built around the LM386. Its parts include 38 resistors, 24 capacitors, 8 diodes, 8 connectors and 4 transistors. It belongs with the audio and music boards of this library.
Main components
1README
README.mdOutput Module
An audio output module for Eurorack, combining two mono input channels into a stereo output with a panning mixer. The stereo output is suitable to drive headphones or small speakers.
Features
- Two input channels (A and B) with the second normaled to the first.
- Independent input level adjustments for both channels
- Stereo panning mixer
- Level indicator (red indicates $V_{pp} \gtrapprox 9V$)
- Output volume control
- LM386 output amplifiers
Parts
100| Qty | Value | Footprint | References |
|---|---|---|---|
| 13 | 100k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R1, R5, R7, R12, R13, R15, R16, R19, R20, R21, R24, R31, R32 |
| 8 | TestPoint | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 |
| 6 | 100n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C15, C16, C17, C18, C23, C24 |
| 4 | 100k | Potentiometer_THT:Potentiometer_Bourns_PTV09A-1_Single_Vertical | RV1, RV2, RV3, RV4 |
| 4 | 10k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R4, R9, R23, R28 |
| 4 | 10u | Capacitor_THT:CP_Radial_D4.0mm_P2.00mm | C1, C4, C13, C14 |
| 4 | 22p | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C2, C3, C5, C6 |
| 4 | AudioJack2_SwitchT | AudioJacks:Jack_3.5mm_QingPu_WQP-PJ301M-12_Vertical | J1, J2, J3, J4 |
| 3 | 100k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6, R14, R22 |
| 3 | 1u | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C8, C21, C22 |
| 2 | 10 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R35, R36 |
| 2 | 10 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R37, R38 |
| 2 | 100n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C19, C20 |
| 2 | 15k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R8, R25 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R29, R30 |
| 2 | 220k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R10, R11 |
| 2 | 220u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C11, C12 |
| 2 | 2M2 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R3, R18 |
| 2 | 2N3904 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q2, Q4 |
| 2 | 2N3906 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q1, Q3 |
| 2 | 330k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R26, R27 |
| 2 | 47k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R2, R17 |
| 2 | 47n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C9, C10 |
| 2 | 4k7 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R33, R34 |
| 2 | Conn_02x08_Odd_Even | Custom_PinHeader_P2.54mm:PinHeader_2x08_P2.54mm_Vertical_ThinPad | J7, J8 |
| 2 | D_Schottky | Diode_THT:D_DO-41_SOD81_P7.62mm_Horizontal | D7, D8 |
| 2 | GREEN | LED_THT:LED_D3.0mm_Clear | D2, D5 |
| 2 | LM386 | Package_DIP:DIP-8_W7.62mm_Socket | U2, U3 |
| 2 | MountingHole | MountingHole:MountingHole_3.2mm_M3_DIN965 | H1, H2 |
| 2 | RED | LED_THT:LED_D3.0mm_Clear | D3, D6 |
| 1 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 1 | 1N4148 | Diode_THT:D_DO-35_SOD27_P2.54mm_Vertical_AnodeUp | D4 |
| 1 | 1u | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C7 |
| 1 | A100K | Potentiometer_THT:Potentiometer_Bourns_PTV112-4_Dual_Vertical | RV5 |
| 1 | AudioJack3 | AudioJacks:Jack_3.5mm_QingPu_WQP-PJ301CM_Vertical | J6 |
| 1 | Conn_02x08_Odd_Even | Connector_IDC:IDC-Header_2x08_P2.54mm_Vertical | J5 |
| 1 | TL074 | Package_DIP:DIP-14_W7.62mm_Socket | U1 |
Questions
How big is the Modular output PCB?
It measures 59.5 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Modular output use?
100 parts, built around the LM386. 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 Modular output KiCad files?
From the xdylanm/modular-output repository on GitHub, at the commit this page was made from: the board is hardware/output/output.kicad_pcb and its schematic hardware/output/output.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Modular output 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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xdylanm/modular-output
An audio output module for Eurorack, combining two mono input channels into a stereo output with a panning mixer. The stereo output is suitable to drive headphones or small speakers.
38 partsMIT
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