HardLabs

PolyTuna

UC3Music·PolyTuna·Polytuna KiCad/Polytuna.kicad_pcb

PolyTuna PCB layout, top view — open source board by UC3Music

About the PolyTuna PCB

PolyTuna is an open source PCB design by UC3Music, published on GitHub. It is a 2-layer board measuring 114.3 × 64.8 mm, with 45 components from 23 distinct parts.

Other key parts include the AP7313-33SAG-7, LM358, SGTL5000 and L7805. By type, the board carries 10 resistors, 8 capacitors, 5 connectors, 4 ICs, 4 switches and 3 LEDs.

It belongs with the audio designs in this gallery.

From the project

A polyphonic tuner pedal

A DIY polyphonic guitar tuner pedal. With it you can check the tuning of all the strings with a single strum, saving you time when you need it most. Very useful for playing live!

This work has been developed by Sergio Sánchez as his Bachelor's Thesis, with David Estevez as his advisor. The Thesis itself can be downloaded here (in Spanish).

A preeliminary study of the guitar signal to decide the best analysis technique for the pedal. This study was made in Matlab and the sources for the study can be found in the MATLAB Analysis folder. A software implementation of the polyphonic tuner to…

PolyTuna, from the project README
From the project README

Main components on the PolyTuna

AP7313-33SAG-7LM358SGTL5000L7805

PolyTuna bill of materials (BOM)

45 components, 23 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
AP7313-33SAG-7
IC1
1
LM358
U1
1
SGTL5000
U2
1
L7805
U3
1
Barrel_Jack
J1
3
Conn_01x02
J2, J3, J5
1
Conn_01x04
J4
1
BOARD_TEENSY_3.1
BOARD1
1
Battery
BT1
1
0.15uF
Ct1
1
600
Ferrite1
2
JACK_FEMALE_STEREO_6_PINS
Input1, Output1
2
2Jumper
JMP1, JMP2
3
POT_TRIM
RV1, RV2, RV3
3
SW_Push
SW1, SW2, SW3
1
SW_TPDT
SW4
3
LED
LED1, LED2, LED3
1
C
C1
4
2.2uF
C2, C3, C6, C8
3
0.1uF
C4, C5, C7
Show 3 more
QtyPartRefs
7
R
R1, R2, R3, R4, R5, R6, R7
2
2.2K
R8, R9
1
10M
R10

PolyTuna design files

The KiCad project lives in the UC3Music/PolyTuna repository on GitHub; these links point at the commit this page was built from.

PolyTuna: common questions

How big is the PolyTuna PCB?

The PolyTuna measures 114.3 × 64.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the PolyTuna?

45 components, from 23 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 PolyTuna design files?

From the UC3Music/PolyTuna repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the PolyTuna design in my own project?

The repository has no license, so all rights stay with UC3Music. Use it as a reference, and ask the author before reusing the design.

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