HardLabs

726-DSSI

DamianAPaul·726-DSSI·726-DSSI_CAD/726-DSSI.kicad_pcb

726-DSSI PCB layout, top view — open source NXP board by DamianAPaul

About the 726-DSSI PCB

726-DSSI is an open source NXP PCB design by DamianAPaul, published on GitHub. It is a 2-layer board measuring 187 × 132 mm, with 46 components from 32 distinct parts.

Its main chip is the Teensy 4.1, from the NXP family. Other key parts include the Audio Shield 4.x RevD2, CD74HC4067 MUX Expansion, MCP23017 Expansion, Hosyond OLED Display and MAX7219 Dot Matrix Display. By type, the board carries 23 switches, 6 ICs and 2 connectors.

It belongs with the audio, displays & leds and dev boards & breakouts designs in this gallery.

From the project

Standalone 8-voice digital synthesizer and 64-step sequencer built around the Teensy 4.1.

A standalone digital synthesizer and 64-step sequencer designed around the Teensy 4.1.

The 726-DSSI is a personal embedded systems project combining real-time digital audio processing, custom C++ firmware, PCB design, physical controls, sequencing, and visual feedback.

- Up to 8 simultaneous oscillator, noise, or sample-based voices - Per-voice filtering and amplitude envelopes - 64-step sequencer - Teensy 4.1 microcontroller - PJRC Audio Shield - SSD1306 OLED display - MAX7219 8x8 LED matrix - MCP23017 GPIO expansion - CD74HC4067 analog multiplexing - 3x4 keyboard matrix - Custom C++…

726-DSSI, from the project README
From the project README

Main components on the 726-DSSI

Teensy 4.1Audio Shield 4.x RevD2CD74HC4067 MUX ExpansionMCP23017 ExpansionHosyond OLED DisplayMAX7219 Dot Matrix Display

726-DSSI bill of materials (BOM)

46 components, 32 distinct parts.

QtyPartRefs
1
Teensy 4.1
U1
1
Audio Shield 4.x RevD2
U2
1
CD74HC4067 MUX Expansion
U3
1
MCP23017 Expansion
U4
1
Hosyond OLED Display
U5
1
MAX7219 Dot Matrix Display
U6
1
Audio Mono Out
J1
1
Barrel_Jack_Switch
J2
15
10k
RV1, RV2, RV3, RV4, RV5, RV6, RV7, RV8 +7
1
C NOTE
SW1
1
C# NOTE
SW2
1
D NOTE
SW3
1
D# NOTE
SW4
1
E NOTE
SW5
1
F NOTE
SW6
1
F# NOTE
SW7
1
G NOTE
SW8
1
G# NOTE
SW9
1
A NOTE
SW10
1
A# NOTE
SW11
Show 12 more
QtyPartRefs
1
B NOTE
SW12
1
PREV VOICE
SW13
1
NEXT VOICE
SW14
1
SOURCE
SW15
1
FILTER
SW16
1
OCT UP
SW17
1
OCT DOWN
SW18
1
FX
SW19
1
RECORD
SW20
1
PLAYSTOP
SW21
1
STEP EDIT
SW22
1
POWER
SW23

726-DSSI design files

The KiCad project lives in the DamianAPaul/726-DSSI repository on GitHub; these links point at the commit this page was built from.

726-DSSI: common questions

What microcontroller does the 726-DSSI use?

The 726-DSSI is built around the Teensy 4.1, from the NXP family.

How big is the 726-DSSI PCB?

The 726-DSSI measures 187 × 132 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 726-DSSI?

46 components, from 32 distinct parts. The full bill of materials is listed on this page.

Where can I download the 726-DSSI design files?

From the DamianAPaul/726-DSSI repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the 726-DSSI design in my own project?

The repository has no license, so all rights stay with DamianAPaul. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the 726-DSSI 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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