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${TITLE}

joaln27·cartridge_pmod

${TITLE} PCB layout, top view — open source board by joaln27
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About the ${TITLE} PCB

${TITLE} is an open source PCB design by joaln27, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 56 × 20 mm, with 25 components from 19 distinct parts.

Other key parts include the W25Q128JVSIM, APS6404L-3SQR-SN and 74LVCE1G126SE-7. By type, the board carries 11 capacitors, 6 resistors, 3 ICs, 3 connectors and 1 inductor.

It belongs with the audio designs in this gallery.

From the project

QSPI flash + PSRAM + audio cartridge Pmod for TinyTapeout — a drop-in remix of the stock QSPI Pmod with sigma-delta audio (RC filter + amp + jack) on the CS2 pin. KiCad, JLC-assemblable

QSPI memory + audio Pmod for the TinyTapeout demo board and the ULX3S console prototype. Drop-in compatible with the stock QSPI Pmod pinout for any flash + single-PSRAM project; PMOD8 (uio[7]) carries sigma-delta audio out instead of the second PSRAM chip select.

v0.1 boards are in hand and bench-verified: ordered from JLCPCB 2026-07-20 (5 PCBs, 2 assembled), tag fab-v0.1, delivered 2026-07-29. Board #1 passed all ten steps of the multimeter bench check the same day and is cleared for first power-up. A self-checking ULX3S bring-up bitstream is ready in fpga/ and runs the moment the ULX3S 85F…

${TITLE}, from the project README
From the project README

Main components on the ${TITLE}

W25Q128JVSIMAPS6404L-3SQR-SN74LVCE1G126SE-7

${TITLE} bill of materials (BOM)

25 components, 19 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
W25Q128JVSIM
U1
1
APS6404L-3SQR-SN
878-APS6404L-3SQR-SN
U2
1
74LVCE1G126SE-7
U4
1
2.54-2*6P
2.54-2*6P Bend insert
J1
1
CONFIG
J2
1
PJ-320B
J3
1
3362P-1-201LF
RV1
1
MLF2012-3R3K
L1
2
0402YC104KAT2A
100n
C1, C5
2
C0402C105M9PAC
1u
C2, C6
1
0402CG220J500NT
22pF
C7
1
10UF
10uF
C8
3
100NF
100nF
C9, C10, C12
1
47NF
47nF
C11
1
47UF
47uF
C13
3
0402WGF1002TCE
10k
R1, R2, R3
1
120R
R4
1
33R
R5
1
470R
R6

${TITLE} design files

The KiCad project lives in the joaln27/cartridge_pmod repository on GitHub; these links point at the commit this page was built from.

${TITLE}: common questions

How big is the ${TITLE} PCB?

The ${TITLE} measures 56 × 20 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ${TITLE}?

25 components, from 19 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 ${TITLE} design files?

From the joaln27/cartridge_pmod 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 ${TITLE} design in my own project?

Yes, under the terms of its Apache-2.0 license, which joaln27 chose for the repository.

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