HardLabs

Cats eye

lennartquerter·euro-rack-synth·modules/clones/cats_eye [Marbles]/KiCad/cats-eye.kicad_pcb

Cats eye PCB layout, top view — open source STM32 board by lennartquerter
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About the Cats eye PCB

Cats eye is an open source STM32 PCB design by lennartquerter, published on GitHub under the CC-BY-NC-4.0 license. It is a 4-layer board measuring 90 × 110 mm, with 223 components from 114 distinct parts.

Its main chip is the TL074, from the STM32 family. Other key parts include the LM13700, TL072, MCP6004, OPA4171 and LM1117DT-3.3. By type, the board carries 80 resistors, 52 capacitors, 26 diodes, 19 connectors, 10 ICs and 7 switches.

It belongs with the audio designs in this gallery.

From the project

Lenimal Github for DIY for a Eurorack Synth

tags: lenimal, eurorack, synthesizer, diy, electronics, music

This is a collection of notes and resources for building a Eurorack synth. I'm not an expert, but I'm learning as I go and I'm happy to share what I've learned.

(First version with 3D printed panels, I'm still missing knobs)

I am not responsible for any damage to any of your modules. The modules within this repository have been tested and built by myself and used only with the other modules in this system.

Cats eye, from the project README
From the project README

Main components on the Cats eye

TL074LM13700TL072MCP6004OPA4171LM1117DT-3.3LM4040DBZ-10

Cats eye bill of materials (BOM)

223 components, 114 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
TL074
STM32F405RGTx
U1
1
LM13700
DAC8164/8165
U2
1
TL072
MCP6004
U3
1
MCP6004
U4
1
OPA4171
U5
2
TL074
U6, U7
2
LM1117DT-3.3
U8, U10
1
LM4040DBZ-10
U9
1
MMBT3904
Q1
1
MMBT3906
MMBT3904
Q2
1
8MHZ
Y1
1
BOOT_RUN
J1
1
RX/TX
J2
1
IO/CLK
J3
9
INPUT
J4, J5, J6, J7, J8, J9, J10, J11 +1
4
CV_OUTPUT
J13, J14, J17, J18
3
GATE_OUTPUT
J15, J16, J19
1
CONN_02X05_PWR_EURORACK
Conn_02x05_PWR_Eurorack
H1
4
B100K
B10K
RV1, RV2, RV7, RV8
2
B500K
B10K
RV3, RV6
Show 94 more
QtyPartRefs
1
B10K
RV4
1
B10K
RV5
1
X_EXT
SW1
1
T_RANGE
SW2
2
SW_ML6
SW3, SW6
1
T_MODE
SW4
1
X_MODE
SW5
1
X_RANGE
SW7
1
NSRT
TP1
1
+3.3VA
TP2
1
+3.3V
TP3
1
+12V
TP4
1
GND
TP5
1
-12V
TP6
1
-10V
TP7
3
Conn_01x16_Socket
XP1, XP3, XP8
3
Conn_01x16_Pin
XP2, XP4, XP7
1
Conn_01x08_Socket
XP5
1
Conn_01x08_Pin
XP6
1
Conn_01x04_Pin
XP9
1
Conn_01x04_Socket
XP10
1
1N4148WS
X_EXT
D1
1
1N4148WS
T_RANGE
D2
1
1N4148WS
T_MODE
D3
1
1N4148WS
X_MODE
D4
1
1N5819WS
X_RANGE
D5
1
1N5819WS
TDK_B72500 [OPT]
D6
1
1N4148
TDK_B72500 [OPT]
D7
1
1N4148
TDK_B72500
D8
1
1N4148WS
TDK_B72500 [OPT]
D9
2
1N4148WS
D10, D13
3
TDK_B72500 [OPT]
D11, D12, D15
1
BAT54S
D14
3
GREEN
D16, D19, D20
4
RED_GREEN
D17, D18, D21, D22
2
1N5819
D23, D24
2
LED
D25, D26
1
1NF
100nF
C1
1
470NF
100nF
C2
2
2.2UF
100nF
C3, C4
1
47NF
10uF
C5
1
33NF
100nF
C6
1
2.2NF
1uF
C7
1
10NF
100nF
C8
1
22NF
20pF
C9
1
47UF
20pF
C10
2
100NF
2.2uF
C11, C12
5
100NF
100nF
C13, C15, C17, C18, C19
1
47UF
10uF
C14
1
100NF
470nF
C16
14
100nF
C20, C21, C22, C23, C24, C37, C38, C39 +6
7
4.7nF
C25, C26, C27, C28, C29, C30, C31
4
49pF
C32, C33, C34, C35
1
470nF
C36
2
47uF
C44, C46
4
10uF
C48, C49, C51, C52
1
470n
C50
1
330K
10K
R1
2
100K
10K
R2, R27
2
100K
100R
R3, R4
1
10K
100R
R5
3
10K
680R
R6, R12, R15
1
68K
680R
R7
1
180K
680R
R8
1
470R
R9
5
680R
R10, R53, R54, R68, R69
1
1K5
680R
R11
1
2K2
470R
R13
1
33K
680R
R14
1
4K7
680R
R16
1
10K
200K
R17
1
6K8
33K
R18
2
1K5
200K
R19, R23
1
3K3
33K
R20
2
10K
100K
R21, R22
2
10K
33K
R24, R26
1
100K
200K
R25
3
100K
R28, R30, R39
11
100K
R29, R32, R40, R41, R42, R45, R46, R47 +3
1
22K
100K
R31
1
10R
200K
R33
1
10R
33K
R34
1
10K
R35
2
200K
R36, R43
2
33K
R37, R44
1
120K
100K
R38
4
23K7
R48, R49, R62, R63
8
1K
R50, R51, R55, R61, R64, R65, R71, R78
3
180R
R52, R60, R70
3
39K
R56, R66, R72
3
56K
R57, R67, R73
1
150K
R74
2
10R
R76, R77
2
2K
R79, R80

Cats eye 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.

Cats eye: common questions

What microcontroller does the Cats eye use?

The Cats eye is built around the TL074, from the STM32 family.

How big is the Cats eye PCB?

The Cats eye measures 90 × 110 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Cats eye?

223 components, from 114 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 Cats eye 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 Cats eye 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.

Can I test firmware for the Cats eye without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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