2 layers148 × 84.5 mm
Panel daisy
ohmtech-rdi/eurorack-blocks
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259 parts410
2 layers39.9 × 48 mm
TagBoardMixer
Acramonics/TagBoardMixerA two channel mixer from tagboardeffects ported to a PCB
- Size
- 39.9 × 48 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 21
- Nets
- 15
- Pads
- 54
- Tracks, vias
- 116, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 19 Sep 2025
- Updated
- 19 Sep 2025
Overview
TagBoardMixer is an open-source printed circuit board by Acramonics, from the Acramonics/TagBoardMixer repository on GitHub. It is a 2-layer board of 39.9 × 48 mm with 21 parts on 15 nets, routed with 116 tracks and 0 vias.
It is built around the TL072. Its parts include 8 resistors, 5 capacitors, 4 connectors, 1 IC and 1 diode. It belongs with the audio and music boards of this library.
Main components
1README
README.mdTwo Channel Mixer
Schematic and Board Design by Andrew Martin
This is a very simple 2-channel mixer with a circuit taken from the Veroboard design at http://tagboardeffects.blogspoit.com/
It has a battery protection diode and 100nF decoupling capactitors on the input followed by the usual 100K mixing resistors. The 9V input is dropped to give a virtual ground of 4.5V using two 100K resistors used as the non-inverting input to the two op amps. These are arranged as two inverting amplifiers with a small degree of amplification (100K negative feedback resistors are used on both).
Parts
21| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 100K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3, R5, R7, R8 |
| 4 | Conn_01x02_Pin | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J1, J2, J3, J4 |
| 2 | 100nF | Capacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mm | C1, C2 |
| 2 | 2.2uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C3, C4 |
| 2 | A10K | Potentiometer_THT:Potentiometer_Alps_RK09L_Single_Vertical | RV1, RV2 |
| 1 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
| 1 | 1M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6 |
| 1 | 1N4001 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | 22uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C5 |
| 1 | TL072 | Package_DIP:DIP-8_W7.62mm | U1 |
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Questions
How big is the TagBoardMixer PCB?
It measures 39.9 × 48 mm and has 2 copper layers, 1.6 mm thick.
What parts does the TagBoardMixer use?
21 parts, built around the TL072. 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 TagBoardMixer KiCad files?
From the Acramonics/TagBoardMixer repository on GitHub, at the commit this page was made from: the board is kicad/TagBoardMixer.kicad_pcb and its schematic kicad/TagBoardMixer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the TagBoardMixer design in my own project?
Its repository states no licence, so its author keeps all rights: ask Acramonics before reusing the design.