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Touchtone555

DarcyJProjects·touchtone555·hardware/TouchTone555.kicad_pcb

Touchtone555 PCB layout, top view — open source board by DarcyJProjects
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About the Touchtone555 PCB

Touchtone555 is an open source PCB design by DarcyJProjects, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 200 × 96 mm, with 73 components from 30 distinct parts.

Other key parts include the NE555P, LM386 and A5K RK097. By type, the board carries 25 capacitors, 9 resistors, 5 connectors, 3 transistors, 3 switches and 3 diodes.

It belongs with the audio designs in this gallery.

From the project

An open-source DIY, NE555-based analogue synthesizer - play notes with a stylus

The TouchTone555 is a fully analogue, NE555-based synthesizer designed for learning about analogue electronics, and a bit of fun too. It was built from scratch as a personal deep-dive into oscillators, signal integrity, analogue filtering, and amplification.

Read the full project write up at: www.darcyjprojects.xyz

⚖️Disclaimer: This synthesizer was developed as a purely educational project to explore analogue electronics and sound synthesis. It is an independent work inspired by the vintage Stylophone, with no affiliation to Dubreq Ltd. or the original Stylophone product. All trademarks…

Touchtone555, from the project README
From the project README

Main components on the Touchtone555

NE555PLM386A5K RK097

Touchtone555 bill of materials (BOM)

73 components, 30 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
NE555P
U1
1
LM386
U2
1
A5K RK097
A5K1
1
BC548
Q1
1
2N3904
Q2
1
2N3906
Q3
1
DC Barrel Jack
J1
1
9V Battery
J2
1
PJ-320A
J3
1
Stylus
J4
1
Speaker
J5
1
Speaker
LS1
1
1825159-1
POWER
SW1
1
1825159-1
VIBRATO
SW2
1
~
SW3
1
3296W 10K
VR1
20
3296W 5K
VR2, VR3, VR4, VR5, VR6, VR7, VR8, VR9 +12
2
1N5817
D1, D3
1
LED
D2
8
100nF
C1, C17, C19, C20, C21, C22, C23, C27
Show 10 more
QtyPartRefs
15
10nF
C2, C3, C4, C5, C6, C7, C8, C9 +7
1
10uF
C18
1
100uF
C24
1
100R
R1
1
10M
R2
2
68K
R3, R4
1
1K
R5
2
10K
R6, R8
1
4.7K
R7
1
330R
R9

Touchtone555 design files

The KiCad project lives in the DarcyJProjects/touchtone555 repository on GitHub; these links point at the commit this page was built from.

Touchtone555: common questions

How big is the Touchtone555 PCB?

The Touchtone555 measures 200 × 96 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Touchtone555?

73 components, from 30 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 Touchtone555 design files?

From the DarcyJProjects/touchtone555 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 Touchtone555 design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which DarcyJProjects chose for the repository.

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