HardLabs

Vcvco

tpcarlson·synth-diy·VCDO/vcvco.kicad_pcb

Vcvco PCB layout, top view — open source board by tpcarlson

About the Vcvco PCB

Vcvco is an open source PCB design by tpcarlson, published on GitHub. It is a 2-layer board measuring 50.1 × 128.5 mm, with 104 components from 30 distinct parts.

Other key parts include the TL074, L79L05_TO92, vcdo and MC78L05. By type, the board carries 44 resistors, 29 capacitors, 7 connectors, 6 ICs, 4 diodes and 1 transistor.

It belongs with the audio designs in this gallery.

From the project

Mostly Eurorack projects

A 10hp Wavetable oscillator with 1v/octave control, pitch, bitcrush, glide, and a separate sub-oscillator output.

As measured by the Joranalogue Test 3, around 40 mA on +12v and 10 mA on -12v at peak. The 5v rail is unused.

The original schematic is from the datasheet for the VCDO chip on the ElectricDruid website (https://electricdruid.net/product/vcdo-wavetable-oscillator/). There were a couple of tweaks to add test points and buffered LED drivers for the main and sub-oscillator outputs.

Vcvco, from the project README
From the project README

Main components on the Vcvco

TL074L79L05_TO92vcdoMC78L05

Vcvco bill of materials (BOM)

104 components, 30 distinct parts.

QtyPartRefs
3
TL074
U1, U3, U5
1
L79L05_TO92
U7
1
vcdo
U8
1
MC78L05
U9
1
BC548
Q1
6
AudioJack2
J1, J2, J3, J4, J5, J6
1
Conn_02x05_Odd_Even
J7
1
47k
RV1
2
20k
RV2, RV6
3
100k
RV3, RV4, RV5
6
10k
RV7, RV8, RV9, RV10, RV11, RV12
1
SW_SPDT
SW1
2
LED_Dual_2pin
D1, D2
2
D_Schottky
D3, D4
6
330p
C1, C2, C3, C4, C7, C8
2
150p
C5, C6
15
100n
C9, C10, C11, C12, C13, C14, C17, C21 +7
4
2.2u
C15, C16, C20, C23
2
10u
C18, C19
4
20k
R1, R2, R3, R4
Show 10 more
QtyPartRefs
2
91k
R5, R12
5
200k
R6, R7, R8, R10, R11
1
180k
R9
8
100k
R13, R14, R15, R16, R27, R28, R29, R30
4
27k
R17, R18, R19, R20
4
4k7
R21, R22, R23, R24
2
51k
R25, R26
10
1k
R31, R32, R33, R34, R35, R36, R37, R38 +2
3
10k
R41, R42, R43
1
10k
R44

Vcvco design files

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

Vcvco: common questions

How big is the Vcvco PCB?

The Vcvco measures 50.1 × 128.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Vcvco?

104 components, from 30 distinct parts. The full bill of materials is listed on this page.

Where can I download the Vcvco design files?

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

Can I use the Vcvco design in my own project?

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

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