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3-phase lfo

tpcarlson·synth-diy·3-phase-lfo/3-phase-lfo.kicad_pcb

3-phase lfo PCB layout, top view — open source board by tpcarlson
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About the 3-phase lfo PCB

3-phase lfo is an open source PCB design by tpcarlson, published on GitHub. It is a 2-layer board measuring 30 × 128.5 mm, with 70 components from 27 distinct parts.

Other key parts include the TL074, HEF4093B, CD4053B, TL072 and 4069. By type, the board carries 25 resistors, 22 capacitors, 9 connectors, 6 diodes, 5 ICs and 2 transistors.

It belongs with the audio designs in this gallery.

From the project

Mostly Eurorack projects

3 Phase LFO is a simple LFO which produces sine-ish waveforms using a somewhat unconventional circuit. It has a two-colour LED to indicate polarity of each output. There is also a single input which can be used to clock the LFO, but it works a little strangely when mixed with the speed control.

I've no idea for this one I'm afriad! The design only uses the + and - 12v rails, with the +5v rail unused.

3-phase lfo, from the project README
From the project README

Main components on the 3-phase lfo

TL074HEF4093BCD4053BTL0724069

3-phase lfo bill of materials (BOM)

70 components, 27 distinct parts.

QtyPartRefs
1
TL074
U1
1
HEF4093B
U2
1
CD4053B
U3
1
TL072
U4
1
4069
U5
1
BC558
Q1
1
BC548
Q2
4
AudioJack2
J1, J2, J4, J5
1
Conn_02x05_Odd_Even
J3
1
Conn_01x05
J6
1
Conn_01x06
J7
1
Conn_01x05
J8
1
Conn_01x06
J9
1
50k
RV1
3
LED_Dual_2pin
D1, D2, D6
2
D_Schottky
D3, D4
1
1N4148
D5
6
2.2n
C1, C2, C5, C6, C12, C14
2
10u
C3, C4
4
330p
C7, C8, C9, C10
Show 7 more
QtyPartRefs
7
100n
C13, C18, C19, C20, C21, C22, C23
3
220n
C15, C16, C17
14
100k
R1, R2, R3, R4, R5, R6, R8, R9 +6
1
2.2k
R7
1
1M
R10
6
1k
R13, R14, R15, R16, R21, R22
3
22k
R23, R24, R25

3-phase lfo 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.

3-phase lfo: common questions

How big is the 3-phase lfo PCB?

The 3-phase lfo measures 30 × 128.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 3-phase lfo?

70 components, from 27 distinct parts. The full bill of materials is listed on this page.

Where can I download the 3-phase lfo design files?

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

Can I use the 3-phase lfo 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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