HardLabs

Compara4

ajjackson·eurorack·kicad6/compara4/compara4.kicad_pcb

Compara4 PCB layout, top view — open source board by ajjackson

About the Compara4 PCB

Compara4 is an open source PCB design by ajjackson, published on GitHub. It is a 2-layer board measuring 78.7 × 104.1 mm, with 64 components from 26 distinct parts.

Other key parts include the TL074, 4070 and 4041. By type, the board carries 32 resistors, 12 connectors, 10 diodes, 5 capacitors, 3 ICs and 1 switch.

It belongs with the audio designs in this gallery.

From the project

Synth DIY stuff

Somewhere to capture and develop some ideas for novel synthesiser modules. Currently that means Eurorack, so +/- 12V power, TS mini jacks, 10V peak-to-peak audio signals.

Not clear at this stage if the end goal is perfboard or PCBs, will see how ambitious the designs get...

Main components on the Compara4

TL07440704041

Compara4 bill of materials (BOM)

64 components, 26 distinct parts.

QtyPartRefs
1
TL074
U1
1
4070
U2
1
4041
U3
1
Conn_01x34_Female
J1
1
Conn_01x34_Male
J2
1
In_1
J3
1
In_2
J4
1
In_3
J5
1
Out_XOR
J6
1
Out_XNOR
J7
1
Out_OR
J8
1
Out_NOR
J9
1
In_4
J10
1
CV_Jack
J11
1
Conn_02x05_Top_Bottom
J12
1
100k
RV1
1
SW_SPDT
SW1
8
1N4148
D1, D2, D3, D4, D5, D6, D7, D8
2
LED_Dual_Bidirectional
D9, D10
3
100n
C1, C2, C3
Show 6 more
QtyPartRefs
2
10uF
C4, C5
2
10k
R1, R22
7
100k
R2, R7, R17, R18, R19, R20, R21
9
47k
R3, R4, R5, R6, R8, R9, R10, R11 +1
4
1M
R13, R14, R15, R16
10
2.2k
R25, R26, R27, R28, R29, R30, R31, R32 +2

Compara4 design files

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

Compara4: common questions

How big is the Compara4 PCB?

The Compara4 measures 78.7 × 104.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Compara4?

64 components, from 26 distinct parts. The full bill of materials is listed on this page.

Where can I download the Compara4 design files?

From the ajjackson/eurorack repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Compara4 design in my own project?

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

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