HardLabs

Voice board

Windfisch·analog-synth·hardware/voice_board/voice_board.kicad_pcb

Voice board layout, top view — open source board by Windfisch

About the Voice board

Voice board is an open source PCB design by Windfisch, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 83.8 × 72.4 mm, with 127 components from 42 distinct parts.

Other key parts include the TL074, MCP4822 and LM324. By type, the board carries 69 resistors, 22 transistors, 16 capacitors, 10 connectors, 4 diodes and 3 ICs.

It belongs with the audio designs in this gallery.

From the project

A low-cost semimodular analog synthesizer

This board offers various utility features for a two-VCO-voice. It is designed to be used together with two ../vco_mk1/ and offers the following features:

- voltage controlled filter - voltage controlled amplifier - simple mixer - 2x square_ctl signal processing (buffering, sync pulse generation, clamping, which are missing from the VCO mk I board) - an expo converter (to be used as VCF input) - a 2-channel MCP4822 DAC for VCO control voltage generation - three general-purpose RC low pass filters

Voice board, from the project README
From the project README

Main components on the Voice board

TL074MCP4822LM324

Voice board bill of materials (BOM)

127 components, 42 distinct parts.

QtyPartRefs
1
TL074
U1
1
MCP4822
U2
1
LM324
U3
2
BC327
Q1, Q3
14
BC557
Q2, Q4, Q5, Q6, Q7, Q8, Q9, Q10 +6
4
BC547
Q17, Q18, Q21, Q22
2
2N7000
Q19, Q20
1
Conn_02x06_Odd_Even
J1
6
Conn_02x02_Odd_Even
J2, J3, J6, J7, J8, J9
2
Conn_01x02_Male
J4, J10
1
Conn_02x03_Odd_Even
J5
2
Jumper_2_Bridged
JP1, JP2
1
Conn_01x04_Male
JP3
2
3V3
D1, D2
2
1N5817
D3, D4
1
470n
C1
2
470u
C2, C7
4
47n
C3, C4, C5, C6
2
1n
C8, C9
3
1u
C10, C11, C17
Show 22 more
QtyPartRefs
3
any
C13, C14, C15
1
10n
C16
9
10k
R1, R2, R18, R19, R39, R57, R58, R59 +1
10
100k
R3, R4, R6, R14, R15, R17, R23, R24 +2
1
200k
R5
4
100k
R7, R16, R20, R40
7
1k
R8, R22, R46, R47, R48, R49, R70
14
10k
R9, R10, R11, R36, R37, R38, R41, R44 +6
2
20k
R12, R13
1
1Meg
R21
1
47k
R25
1
180
R26
2
470
R27, R35
4
150
R28, R29, R30, R31
1
220
R32
1
680
R34
3
1Meg
R42, R43, R69
2
1k
R53, R54
3
any
R63, R64, R65
1
200k
R67
1
2.5k
R68
1
10k
R71

Voice board design files

The KiCad project lives in the Windfisch/analog-synth repository on GitHub; these links point at the commit this page was built from.

Voice board: common questions

How big is the Voice board?

The Voice board measures 83.8 × 72.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Voice board?

127 components, from 42 distinct parts. The full bill of materials is listed on this page.

Where can I download the Voice board design files?

From the Windfisch/analog-synth repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Voice board design in my own project?

Yes, under the terms of its GPL-3.0 license, which Windfisch chose for the repository.

More boards in analog-synth

Similar boards