HardLabs

SAX 3

tomcombriat·TES_e-sax·hardware/v3d1/SAX_3.kicad_pcb

SAX 3 PCB layout, top view — open source NXP board by tomcombriat

About the SAX 3 PCB

SAX 3 is an open source NXP PCB design by tomcombriat, published on GitHub under the TAPR-OHL-1.0 license. It is a 2-layer board measuring 132 × 90.4 mm, with 44 components from 18 distinct parts.

Its main chip is the Teensy3.2 - USB ->, from the NXP family. Other key parts include the 74HC165. By type, the board carries 29 resistors, 8 connectors, 4 ICs and 3 capacitors.

It belongs with the audio and sensors designs in this gallery.

From the project

This is the program and hardware for the TES e-sax

More infos: https://t-e-s.frama.site/en/tesaxophone

The E-sax is an EWI made out of a real sax. It outputs MIDI signals that can be used to generate sounds using a synthesizer for instance the 10k synth. It is design to provide saxophone players a digital instrument to which they can transition easily. Additionnaly from the "standard" behavior it also have features that are allowed by a digital instrument:

Main components on the SAX 3

74HC165Teensy3.2 - USB ->

SAX 3 bill of materials (BOM)

44 components, 18 distinct parts.

QtyPartRefs
3
74HC165
U1, U2, U3
1
Teensy3.2 - USB ->
U4
1
J - 3.3 G
J1
1
LED strip
J2
1
SSD1306 G 3.3
J3
1
Midi M4 M2 M5
J4
1
Batt
J5
1
Beak - R BK Y
J6
1
Conn_01x03_Female
J7
1
MXP5010
J8
1
1000u Ch
C1
1
100u
C2
1
0.1 ceram
C3
24
10k
R1, R2, R3, R4, R5, R6, R7, R8 +16
1
220
R25
1
10
R26
1
33
R27
2
22k
R28, R29

SAX 3 design files

The KiCad project lives in the tomcombriat/TES_e-sax repository on GitHub; these links point at the commit this page was built from.

SAX 3: common questions

What microcontroller does the SAX 3 use?

The SAX 3 is built around the Teensy3.2 - USB ->, from the NXP family.

How big is the SAX 3 PCB?

The SAX 3 measures 132 × 90.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the SAX 3?

44 components, from 18 distinct parts. The full bill of materials is listed on this page.

Where can I download the SAX 3 design files?

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

Can I use the SAX 3 design in my own project?

Yes, under the terms of its TAPR-OHL-1.0 license, which tomcombriat chose for the repository.

Can I test firmware for the SAX 3 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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