HDD Synth prototype MK2
MaverickUK·HDDSynth·2_prototype_mk2/hardware/HDD Synth prototype MK2/HDD Synth prototype MK2.kicad_pcb
About the HDD Synth prototype MK2 PCB
HDD Synth prototype MK2 is an open source RP2040/RP2350 PCB design by MaverickUK, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 136.2 × 86.6 mm, with 17 components from 16 distinct parts.
Its main chip is the RaspberryPi_Pico, from the RP2040/RP2350 family. Other key parts include the C42381015. By type, the board carries 4 resistors, 3 diodes, 1 IC, 1 module and 1 connector.
It belongs with the audio and retro computing designs in this gallery.
From the project
Recreate the sound of mechanical spinning HDDs on retro PCs that use a solid state drive
Uses through hole components and breakout boards for the SD card reader and audio amp

Main components on the HDD Synth prototype MK2
HDD Synth prototype MK2 bill of materials (BOM)
17 components, 16 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | C42381015 Optocoupler_DC_PhotoNPN_AKEC | DIP-4_W7.62mm | U1 |
| 1 | RaspberryPi_Pico | RaspberryPi_Pico_Common_Unspecified | A1 |
| 1 | C49257 Bus_ISA_8bit | BUS_AT | J2 |
| 2 | C124375 Conn_01x02 | PinHeader_1x02_P2.54mm_Vertical | H1, H2 |
| 1 | C124375 Conn_01x09 | PinHeader_1x09_P2.54mm_Vertical | H3 |
| 1 | Conn_01x07 | PinHeader_1x07_P2.54mm_Vertical | H4 |
| 1 | Debug_power_header | PinHeader_2x03_P2.54mm_Vertical | H5 |
| 1 | R_Potentiometer | Potentiometer_Bourns_3386W_Horizontal | Pot1 |
| 1 | 1.5F | CP_Radial_D16.0mm_P7.50mm | Super_Cap1 |
| 1 | SMAJ5.0A 1N5817 | D_DO-41_SOD81_P2.54mm_Vertical_AnodeUp | D1 |
| 1 | 1N5817 | D_DO-41_SOD81_P2.54mm_Vertical_AnodeUp | D2 |
| 1 | C81598 D_Zener_5.1v | D_DO-35_SOD27_P7.62mm_Horizontal | D3 |
| 1 | C23138 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | C23138 2K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 50R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | 330R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5 |
HDD Synth prototype MK2 design files
The KiCad project lives in the MaverickUK/HDDSynth repository on GitHub; these links point at the commit this page was built from.
HDD Synth prototype MK2: common questions
What microcontroller does the HDD Synth prototype MK2 use?
The HDD Synth prototype MK2 is built around the RaspberryPi_Pico, from the RP2040/RP2350 family.
How big is the HDD Synth prototype MK2 PCB?
The HDD Synth prototype MK2 measures 136.2 × 86.6 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the HDD Synth prototype MK2?
17 components, from 16 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 HDD Synth prototype MK2 design files?
From the MaverickUK/HDDSynth 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 HDD Synth prototype MK2 design in my own project?
It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.
Can I test firmware for the HDD Synth prototype MK2 without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.
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HDD Synth Prototype MK5
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100.3 × 69.9 mm101 parts2LCC-BY-NC-4.015RP2040/RP2350
HDD Synth prototype MK3
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119.4 × 97.4 mm45 parts2LCC-BY-NC-4.015RP2040/RP2350
HDD Synth Prototype MK4
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RP2350A QFN-60 Minimal Design Example
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HDD Synth
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136.2 × 86.6 mm6 parts2LCC-BY-NC-4.015HDD Synth ISA adapter
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124.5 × 85.9 mm6 parts2LCC-BY-NC-4.015
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