HardLabs

01 as3340 vco

bmurauer·cynthia·01_as3340_vco/01_as3340_vco.kicad_pcb

01 as3340 vco PCB layout, top view — open source board by bmurauer

About the 01 as3340 vco PCB

01 as3340 vco is an open source PCB design by bmurauer, published on GitHub. It is a 2-layer board measuring 60 × 108 mm, with 96 components from 52 distinct parts.

Other key parts include the TL072, AS3340 and TL074. By type, the board carries 50 resistors, 17 capacitors, 8 connectors, 4 test points, 4 diodes and 3 ICs.

It belongs with the audio designs in this gallery.

From the project

Plans for my modular synthesizer

This design is based on the design from Eddy Bergman, which is based on a DigiSound 80 VCO.

I have made the following modifications to it:

- I have included a switch that changes the capacitor to a larger one, allowing for mad slow LFO action. - the output stages are modified so that the VCO roughly produces -5V/+5V outputs (instead of 0/+10V). - the design includes a sine wave output. This is based on Eddy Bergmans Triangle to Sine converter. - the triangle wave has a dedicated centering trimmer, as I thought that centering the signal is essential for the sine wave conversion - I think if…

Main components on the 01 as3340 vco

TL072AS3340TL074

01 as3340 vco bill of materials (BOM)

96 components, 52 distinct parts.

QtyPartRefs
1
TL072
U1
1
AS3340
U2
1
TL074
U3
2
BC847
Q1, Q2
1
SYNC IN
J3
1
FM IN
J4
1
PWM CV IN
J5
1
1V per O IN
J6
1
SQUARE OUT
J7
1
SAW OUT
J8
1
TRI OUT
J9
1
SINE OUT
J10
1
Eurorack 10 pin header
H1
1
250k
RV1
4
100k
RV2, RV3, RV4, RV5
1
~
SW1
1
SW_SPDT
SW2
2
10k
TP1, TP3
1
100k
TP2
1
50k
TP4
Show 32 more
QtyPartRefs
2
1N4148WS
D1, D2
2
SS14
D3, D4
4
1nF
C1, C2, C3, C4
7
100nF
C5, C12, C13, C14, C17, C18, C19
2
10nF
C6, C9
2
22uF
C7, C8
1
10nF
C15
1
820pF
C16
8
100k
R1, R2, R3, R7, R26, R28, R31, R38
1
300k
R4
1
3M3
R5
3
1M
R6, R12, R50
1
1M2
R8
2
470R
R9, R14
4
10k
R10, R11, R24, R41
1
270k
R13
2
220k
R15, R17
4
47k
R16, R18, R25, R37
3
24k
R19, R46, R47
1
5k6
R20
1
1k8
R21
1
680R
R22
2
2k2
R23, R42
2
27k
R27, R30
2
120k
R29, R39
1
150k
R32
1
20k
R33
2
33k
R34, R36
1
390R
R35
1
82k
R40
4
1k
R43, R44, R45, R48
1
51k
R49

01 as3340 vco design files

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

01 as3340 vco: common questions

How big is the 01 as3340 vco PCB?

The 01 as3340 vco measures 60 × 108 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 01 as3340 vco?

96 components, from 52 distinct parts. The full bill of materials is listed on this page.

Where can I download the 01 as3340 vco 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 01 as3340 vco 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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