Guitar audio frontend filter
About the Guitar audio frontend filter PCB
Guitar audio frontend filter is an open source PCB design by TomasOsP, published on GitHub under the CC-BY-4.0 license. It is a 2-layer board measuring 73 × 40 mm, with 21 components from 14 distinct parts.
Other key parts include the Opamp_Dual. By type, the board carries 8 resistors, 5 capacitors, 4 connectors, 1 IC and 1 switch.
It belongs with the audio designs in this gallery.
From the project
Analog guitar-audio front-end filter — KiCad hardware (CC BY 4.0)
An analog signal-conditioning front-end that brings an electric-guitar signal into the ADC range of any general-purpose microcontroller — an Arduino Nano, ESP32, or Raspberry Pi Pico — without needing a dedicated audio MCU.
A raw electric-guitar signal is only a few millivolts — far below what an 8- or even 16-bit ADC can resolve. Sampled directly, the musical information is lost in the noise floor. This board conditions the signal on both ends of the useful band so it lands in a range the microcontroller's ADC can sample with real resolution.
Main components on the Guitar audio frontend filter
Guitar audio frontend filter bill of materials (BOM)
21 components, 14 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Opamp_Dual | DIP-8_W7.62mm | U1 |
| 2 | Conn_01x02_Socket | TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J1, J3 |
| 1 | Conn_01x03_Socket | TerminalBlock_Phoenix_MKDS-1,5-3-5.08_1x03_P5.08mm_Horizontal | J2 |
| 1 | Conn_01x02_Socket | PinHeader_1x02_P2.54mm_Vertical | J4 |
| 2 | TestPoint | TestPoint_Loop_D3.50mm_Drill1.4mm_Beaded | 3v3, 5v |
| 1 | SW_DIP_x04 | SW_DIP_SPSTx04_Slide_9.78x12.34mm_W7.62mm_P2.54mm | SW1 |
| 2 | 0.1u | C_Disc_D3.8mm_W2.6mm_P2.50mm | C1, C4 |
| 2 | 200p | C_Disc_D3.0mm_W1.6mm_P2.50mm | C2, C5 |
| 1 | 10u | C_Radial_D4.0mm_H5.0mm_P1.50mm | C3 |
| 2 | 160k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R7 |
| 2 | 80k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R8 |
| 1 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 20k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 2 | 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5, R6 |
Guitar audio frontend filter design files
The KiCad project lives in the TomasOsP/guitar-audio-frontend-filter repository on GitHub; these links point at the commit this page was built from.
- LayoutPedalDigital.kicad_pcb
- SchematicPedalDigital.kicad_sch
- BOMDocs/bom.csv
Guitar audio frontend filter: common questions
How big is the Guitar audio frontend filter PCB?
The Guitar audio frontend filter measures 73 × 40 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Guitar audio frontend filter?
21 components, from 14 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 Guitar audio frontend filter design files?
From the TomasOsP/guitar-audio-frontend-filter repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Guitar audio frontend filter design in my own project?
Yes, under the terms of its CC-BY-4.0 license, which TomasOsP chose for the repository.
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