HardLabs

Compressor

lennartquerter·euro-rack-synth·modules/utility/7-compressor/kiCad/compressor.kicad_pcb

Compressor PCB layout, top view — open source board by lennartquerter

About the Compressor PCB

Compressor is an open source PCB design by lennartquerter, published on GitHub under the CC-BY-NC-4.0 license. It is a 4-layer board measuring 60 × 110 mm, with 174 components from 38 distinct parts.

Other key parts include the TL072 and TL074. By type, the board carries 74 resistors, 38 diodes, 24 capacitors, 10 transistors, 7 connectors and 6 ICs.

It belongs with the audio designs in this gallery.

From the project

Lenimal Github for DIY for a Eurorack Synth

A eurorack module to compress audio signals. It is based on the Compressor module by MKI.

This compressor has dual channels, each with its own set of controls. The controls are as follows:

- Threshold: Sets the level at which the compressor starts to work. Signals above this level will be compressed. - Ratio: Sets the amount of compression applied to the signal. A higher ratio means more compression. - Attack: Sets the time it takes for the compressor to start working after the signal exceeds the threshold. A shorter attack time means the compressor will respond more quickly to peaks in the…

Main components on the Compressor

TL072TL074

Compressor bill of materials (BOM)

174 components, 38 distinct parts — part numbers from the project's BOM.

QtyPartRefs
4
TL072
U1, U4, U5, U6
2
TL074
U2, U3
10
MMBT3904
Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 +2
1
LEFT_OUT
J1
1
RIGHT_OUT
J2
1
STEREO_OUT
J3
2
INPUT
J4, J5
2
SIDECHAIN_IN
J6, J7
1
CONN_02X05_PWR_EURORACK
Conn_02x05_PWR_Eurorack
H1
4
A100K
RV1, RV2, RV7, RV11
2
A20K
RV3, RV4
2
A10K
RV5, RV9
2
A500K
RV6, RV10
2
A1M
RV8, RV12
2
SW_SPDT
SW1, SW2
26
1N4148WS
D1, D2, D9, D10, D15, D16, D17, D18 +18
10
LED
D3, D4, D5, D6, D11, D12, D13, D14 +2
2
1N5819WS
D7, D8
6
1.5UF
1.5uF
C1, C2, C19, C20, C22, C24
2
47UF
47uF
C3, C11
Show 18 more
QtyPartRefs
14
100NF
100nF
C4, C5, C6, C7, C8, C9, C10, C12 +6
2
680PF
680pF
C21, C23
4
1K
R1, R3, R52, R67
2
20K
R2, R4
8
3K3
R5, R8, R11, R14, R19, R22, R25, R28
2
47K
R6, R20
8
33K
R7, R10, R13, R16, R21, R24, R27, R30
2
120K
R9, R23
2
220K
R12, R26
2
330K
R15, R29
2
10R
R17, R18
22
100K
R31, R32, R34, R35, R37, R38, R39, R41 +14
8
10K
R33, R36, R40, R43, R46, R47, R61, R62
2
470R
R45, R60
2
0R
R49, R64
4
470K
R55, R59, R70, R74
2
2K
R56, R71
2
200R
R57, R72

Compressor design files

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

Compressor: common questions

How big is the Compressor PCB?

The Compressor measures 60 × 110 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Compressor?

174 components, from 38 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 Compressor design files?

From the lennartquerter/euro-rack-synth 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 Compressor design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

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