HardLabs

03 env vca

bmurauer·cynthia·kosmo/kosmo_env_pluck/schematics/03_env_vca.kicad_pcb

03 env vca PCB layout, top view — open source board by bmurauer

About the 03 env vca PCB

03 env vca is an open source PCB design by bmurauer, published on GitHub. It is a 2-layer board measuring 20 × 109 mm, with 45 components from 24 distinct parts.

Other key parts include the TL072 and LM358. By type, the board carries 22 resistors, 7 capacitors, 5 connectors, 3 diodes, 2 ICs and 2 transistors.

It belongs with the audio designs in this gallery.

From the project

Plans for my modular synthesizer

Provides two envelope generators, the first of which also controls a VCA. I build this because i always have at least one envelope generator controlling my vca, so i wanted to save some space by having one VCA built-in.

This one is a bit of a hack, it combines a rail-to-rail LM224 opamp for the env generator with a TL072 for the built-in VCA.

Main components on the 03 env vca

TL072LM358

03 env vca bill of materials (BOM)

45 components, 24 distinct parts.

QtyPartRefs
1
TL072
U1
1
LM358
U2
2
BC847
Q1, Q2
1
gate in
J1
1
signal in
J2
1
Eurorack
J3
1
Signal out
J4
1
env out
J5
1
100k
RV1
2
1M
RV2, RV3
1
Pluck / AD 1
SW1
3
1N4148
D1, D2, D3
1
47nF
C1
2
50uF
C2, C3
3
100nF
C4, C6, C7
1
1uF
C5
9
100k
R1, R2, R3, R5, R8, R12, R15, R18 +1
2
82k
R4, R16
2
100R
R6, R11
3
10k
R7, R13, R14
Show 4 more
QtyPartRefs
2
20k
R9, R10
1
18k
R17
1
560R
R20
2
1k
R21, R22

03 env vca design files

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

03 env vca: common questions

How big is the 03 env vca PCB?

The 03 env vca measures 20 × 109 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 03 env vca?

45 components, from 24 distinct parts. The full bill of materials is listed on this page.

Where can I download the 03 env vca design files?

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

Can I use the 03 env vca design in my own project?

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

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