Processing
mamaheux·bass-amplifier·electronics/processing/processing.kicad_pcb
About the Processing PCB
Processing is an open source NXP PCB design by mamaheux, published on GitHub under the MIT license. It is a 2-layer board measuring 100 × 100 mm, with 194 components from 60 distinct parts.
Its main chip is the Teensy_4.0, from the NXP family. Other key parts include the TL074, TL072, MCP6541, SN74AUC1G74 and CS4270. By type, the board carries 72 resistors, 57 capacitors, 31 test points, 10 ICs, 10 diodes and 8 connectors.
It belongs with the audio designs in this gallery.

Main components on the Processing
Processing bill of materials (BOM)
194 components, 60 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | TL074 | SOIC-14_3.9x8.7mm_P1.27mm | U1, U2, U4, U5 |
| 2 | TL072 | SOIC-8_3.9x4.9mm_P1.27mm | U3, U10 |
| 1 | Teensy_4.0 | Teensy_4.0 | U6 |
| 1 | MCP6541 | SOIC-8_3.9x4.9mm_P1.27mm | U7 |
| 1 | SN74AUC1G74 | SSOP-8_2.95x2.8mm_P0.65mm | U8 |
| 1 | CS4270 | TSSOP-24_4.4x7.8mm_P0.65mm | U9 |
| 1 | TD9944 | SOIC-8_3.9x4.9mm_P1.27mm | Q1 |
| 1 | MMUN2111LT1 | SOT-23 | Q3 |
| 1 | MMBT2222A | SOT-23 | Q4 |
| 2 | Conn_01x06_Male | PinSocket_1x06_P2.54mm_Vertical | J1, J2 |
| 1 | power_amp | PinSocket_1x02_P2.54mm_Vertical | J3 |
| 1 | control board | PinSocket_1x03_P2.54mm_Vertical | J4 |
| 1 | AudioJack2_X4 | PinSocket_1x08_P2.54mm_Vertical | J5 |
| 1 | AudioJack2_XLR_SW | PinSocket_1x07_P2.54mm_Vertical | J6 |
| 1 | Conn_01x03_Male | PinSocket_1x03_P2.54mm_Vertical | J7 |
| 1 | Conn_01x02_Male | PinSocket_1x02_P2.54mm_Vertical | J8 |
| 2 | R_POT | PinSocket_1x03_P2.54mm_Vertical | RV1, RV2 |
| 1 | 10k | PinSocket_1x05_P2.54mm_Vertical | RV_SW1 |
| 31 | TP | PinHeader_1x01_P1.00mm_Vertical | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 +23 |
| 8 | 12V | D_1806_4516Metric | D1, D2, D3, D4, D5, D6, D7, D8 |
Show 40 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 6.2V | D_1806_4516Metric | D9, D10 |
| 4 | 1000µF/25V | CP_Radial_D10.0mm_P5.00mm | C1, C2, C3, C4 |
| 21 | 2.2µF/25V/UL ESR | C_0805_2012Metric | C5, C6, C7, C8, C9, C10, C11, C12 +13 |
| 1 | 100pF/100V | C_0805_2012Metric | C19 |
| 2 | 220pF/100V | C_0805_2012Metric | C20, C24 |
| 9 | 10µF/50V | C_1206_3216Metric | C21, C26, C28, C29, C33, C36, C41, C42 +1 |
| 1 | 0.1µF/100V | C_0805_2012Metric | C22 |
| 1 | 0.22µF/100V | C_0805_2012Metric | C23 |
| 1 | 1nF/100V | C_0805_2012Metric | C25 |
| 3 | 4.7nF/100V | C_0805_2012Metric | C27, C31, C32 |
| 1 | 0.047µF/100V | C_0805_2012Metric | C38 |
| 2 | 3.3µF/25V | C_0805_2012Metric | C39, C40 |
| 1 | 3600pF/50V | C_0805_2012Metric | C43 |
| 2 | 220pF/50V | C_0805_2012Metric | C44, C45 |
| 4 | 0.1µF/25V | C_0603_1608Metric | C47, C48, C53, C54 |
| 1 | 47µF/10V | C_0805_2012Metric | C49 |
| 1 | 10µF/10V | C_0805_2012Metric | C50 |
| 2 | 1µF/6.3V | C_0805_2012Metric | C51, C52 |
| 9 | 0 | R_0805_2012Metric | R1, R4, R5, R8, R16, R18, R21, R39 +1 |
| 4 | inf | R_0805_2012Metric | R2, R6, R11, R19 |
| 17 | 10k | R_0805_2012Metric | R3, R12, R15, R30, R31, R38, R40, R41 +9 |
| 1 | 47.5k | R_0805_2012Metric | R7 |
| 2 | 12.1k | R_0805_2012Metric | R9, R13 |
| 1 | 1M | R_0805_2012Metric | R10 |
| 1 | 221 | R_0805_2012Metric | R14 |
| 1 | 2.21k | R_0805_2012Metric | R17 |
| 1 | 56.2k | R_0805_2012Metric | R20 |
| 1 | 23.7k | R_0805_2012Metric | R22 |
| 8 | 5.11k | R_0805_2012Metric | R23, R24, R27, R28, R35, R46, R47, R50 |
| 5 | 20k | R_0805_2012Metric | R25, R29, R44, R45, R51 |
| 2 | 10.2k | R_0805_2012Metric | R26, R34 |
| 2 | 1k | R_0805_2012Metric | R32, R33 |
| 2 | 100k | R_0805_2012Metric | R36, R37 |
| 1 | 4.75k | R_0805_2012Metric | R52 |
| 7 | 2k | R_0805_2012Metric | R54, R55, R59, R60, R66, R68, R69 |
| 2 | 470 | R_0805_2012Metric | R58, R61 |
| 1 | 3.09k | R_0805_2012Metric | R62 |
| 1 | 15.4k | R_0805_2012Metric | R64 |
| 1 | 560 | R_0805_2012Metric | R67 |
| 2 | inf or 47k | R_0805_2012Metric | R71, R72 |
Processing design files
The KiCad project lives in the mamaheux/bass-amplifier repository on GitHub; these links point at the commit this page was built from.
Processing: common questions
What microcontroller does the Processing use?
The Processing is built around the Teensy_4.0, from the NXP family.
How big is the Processing PCB?
The Processing measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Processing?
194 components, from 60 distinct parts. The full bill of materials is listed on this page.
Where can I download the Processing design files?
From the mamaheux/bass-amplifier repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Processing design in my own project?
Yes, under the terms of its MIT license, which mamaheux chose for the repository.
Can I test firmware for the Processing without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug NXP firmware against it before you order a PCB.
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