HardLabs

Sequencer Back

yry-dev·maddie-synths·hardware/maddie-sequencerV2/sequencer_back_pcb/sequencer_back_pcb.kicad_pcb

Sequencer Back PCB layout, top view — open source AVR/Arduino board by yry-dev
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About the Sequencer Back PCB

Sequencer Back is an open source AVR/Arduino PCB design by yry-dev, published on GitHub under the MIT license. It is a 2-layer board measuring 38.1 × 65.4 mm, with 14 components from 10 distinct parts.

Its main chip is the Arduino_Nano_v3.x, from the AVR/Arduino family. By type, the board carries 6 diodes, 5 connectors, 2 capacitors and 1 module.

It belongs with the audio designs in this gallery.

From the project

My Open Source / Public Eurorack projects

- More details on each firmware is on my site - More about me at madelyn.sh - You can purchase some of my work from my etsy store

The repo-wide default is MIT (LICENSE.md at the root, © 2026 Madelyn Yeary). Every source file carries a License: notice in its header saying which terms apply to it and where the code came from.

That default is overridden per directory: any directory containing its own LICENSE.md is governed by that file instead, for everything beneath it. The overrides exist because the work there either came from somewhere else or is deliberately released on different terms

Main components on the Sequencer Back

Arduino_Nano_v3.x

Sequencer Back bill of materials (BOM)

14 components, 10 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
Arduino_Nano_v3.x
A1
2
-
Conn_01x04_Pin
J9, J10
1
-
Conn_01x11_Pin
J11
1
-
Eurorack_2x8_Power
J12
1
-
Conn_01x03_Socket
J13
3
SS54
BZX79-C5V1
D1, D2, D3
2
SMBJ13A
BZX79-C5V1
D4, D5
1
SMBJ6.0A
BZX79-C5V1
D6
1
100N
100nF
C1
1
100N
10uF
C2

Sequencer Back design files

The KiCad project lives in the yry-dev/maddie-synths repository on GitHub; these links point at the commit this page was built from.

Sequencer Back: common questions

What microcontroller does the Sequencer Back use?

The Sequencer Back is built around the Arduino_Nano_v3.x, from the AVR/Arduino family.

How big is the Sequencer Back PCB?

The Sequencer Back measures 38.1 × 65.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Sequencer Back?

14 components, from 10 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 Sequencer Back design files?

From the yry-dev/maddie-synths 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 Sequencer Back design in my own project?

Yes, under the terms of its MIT license, which yry-dev chose for the repository.

Can I test firmware for the Sequencer Back without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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