HardLabs

Envelope

QuinnFreedman·modular·modules/Envelope/PCBs/envelope_pcb/envelope_pcb.kicad_pcb

Envelope PCB layout, top view — open source AVR/Arduino board by QuinnFreedman

About the Envelope PCB

Envelope is an open source AVR/Arduino PCB design by QuinnFreedman, published on GitHub. It is a 2-layer board measuring 38 × 100 mm, with 60 components from 26 distinct parts.

Its main chip is the Arduino_Nano_v3.x, from the AVR/Arduino family. Other key parts include the MCP4922 and MCP6004. By type, the board carries 26 resistors, 14 connectors, 4 diodes, 3 capacitors, 2 ICs and 2 transistors.

It belongs with the audio designs in this gallery.

From the project

A collection of free & open source DIY synthesizer module designs for Eurorack

Envelope, from the project README
From the project README

Main components on the Envelope

MCP4922MCP6004Arduino_Nano_v3.x

Envelope bill of materials (BOM)

60 components, 26 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
MCP4922
U1
1
MCP6004
U2
1
Arduino_Nano_v3.x
A1
2
2N3904
Q1, Q2
8
THONKICONN
J1, J2, J3, J4, J5, J6, J7, J8
1
Conn_01x08_Pin
J9
1
Conn_01x08_Socket
J10
1
Conn_01x07_Pin
J11
1
Conn_01x07_Socket
J12
1
Eurorack_2x8_Power
J13
1
Conn_02x02_Odd_Even
J14
2
Board
B1, B2
1
Pin_D0.7mm_L6.5mm_W1.8mm_FlatFork
G2
4
10kΩ
RV1, RV2, RV3, RV4
1
TL1105SPF250Q
SW1
1
YELLOW
D1
1
BLUE
D2
1
RED
D3
1
GREEN
D4
1
10uF
C1
Show 6 more
QtyPartRefs
2
100nF
C2, C3
12
100kΩ
R1, R3, R5, R7, R13, R14, R15, R16 +4
4
200kΩ
R2, R4, R6, R8
4
2kΩ
R9, R10, R11, R12
4
10kΩ
R21, R22, R23, R24
2
1kΩ
R25, R26

Envelope design files

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

Envelope: common questions

What microcontroller does the Envelope use?

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

How big is the Envelope PCB?

The Envelope measures 38 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Envelope?

60 components, from 26 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 Envelope design files?

From the QuinnFreedman/modular 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 Envelope design in my own project?

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

Can I test firmware for the Envelope 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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