4 layers163 × 116.5 mm
2 layers49.8 × 44.3 mm
LFO
gehel/synth- Size
- 49.8 × 44.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 94
- Nets
- 69
- Pads
- 270
- Tracks, vias
- 580, 26
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 4 Oct 2023
- Updated
- 2 May 2026
Overview
LFO is an open-source printed circuit board by gehel, from the gehel/synth repository on GitHub. It is a 2-layer board of 49.8 × 44.3 mm with 94 parts on 69 nets, routed with 580 tracks and 26 vias.
It is built around the TL082, LM13700M and TL072. Its parts include 56 resistors, 12 capacitors, 6 ICs, 6 transistors and 4 connectors.
Main components
3
TL082
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 13V/us 2 2.5nA 36V 3MHz 3mV 85dB Short-Circuit Protection SOP-8 FET Input Amplifiers ROHSGcoreOperational Amplifier
LM13700M
SOIC-16-16V~-4.75V、4.75V~16V 0℃~+70℃ 110dB 2 2.6mA 20mA 400nA 4mV 50V/us 600nA 9.5V~32V SOIC-16 Operational Amplifier ROHSTexas InstrumentsOperational AmplifierTL072
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 10V/us 10mV 2 2.5nA 3MHz 85dB SOP-8 Operational Amplifier ROHSGcoreOperational Amplifier
Parts
94| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 100K | Resistor_SMD:R_0805_2012Metric | R2, R3, R4, R9, R10, R12, R26, R31, R33, R53, R54, R55 |
| 12 | 10K | Resistor_SMD:R_0805_2012Metric | R19, R20, R23, R28, R34, R35, R38, R43, R48, R49, R50, R52 |
| 6 | 100nF | Capacitor_SMD:C_0201_0603Metric | C7, C8, C9, C10, C11, C12 |
| 6 | 4.7K | Resistor_SMD:R_0805_2012Metric | R11, R18, R32, R47, R51, R56 |
| 4 | Conn_01x01 | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | LEDA1, SAW1, SIN1, TRI1 |
| 4 | TL082 | Package_SO:SOP-8_3.9x4.9mm_P1.27mm | U2, U3, U5, U6 |
| 3 | 1K | Resistor_SMD:R_0805_2012Metric | R1, R36, R41 |
| 3 | 2N3904 | Package_TO_SOT_THT:TO-92_HandSolder | Q3, Q4, Q6 |
| 3 | 47K | Resistor_SMD:R_0805_2012Metric | R6, R8, R29 |
| 2 | 10pF | Capacitor_SMD:C_0201_0603Metric | C2, C4 |
| 2 | 10uF | Capacitor_THT:CP_Radial_D4.0mm_P2.00mm | C5, C6 |
| 2 | 15K | Resistor_SMD:R_0805_2012Metric | R21, R22 |
| 2 | 180K | Resistor_SMD:R_0805_2012Metric | R39, R42 |
| 2 | 1N914 | Diode_SMD:D_SOD-123 | D1, D2 |
| 2 | 20K | Resistor_SMD:R_0805_2012Metric | R5, R7 |
| 2 | 27K | Resistor_SMD:R_0805_2012Metric | R17, R45 |
| 2 | 30K | Resistor_SMD:R_0805_2012Metric | R14, R15 |
| 2 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H1, H2 |
| 2 | NJFET | Package_TO_SOT_THT:TO-92_HandSolder | Q1, Q2 |
| 1 | 100K | Potentiometer_THT:Potentiometer_Bourns_3266Y_Vertical | TRISKEW1 |
| 1 | 100pF | Capacitor_SMD:C_0201_0603Metric | C3 |
| 1 | 110K | Resistor_SMD:R_0805_2012Metric | R27 |
| 1 | 120K | Resistor_SMD:R_0805_2012Metric | R25 |
| 1 | 1M | Resistor_SMD:R_0805_2012Metric | R46 |
| 1 | 20nF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1 |
| 1 | 270K | Resistor_SMD:R_0805_2012Metric | R30 |
| 1 | 2K | Resistor_SMD:R_0805_2012Metric | R37 |
| 1 | 2K | Potentiometer_THT:Potentiometer_Bourns_3266Y_Vertical | RAMP1 |
| 1 | 2M | Resistor_SMD:R_0805_2012Metric | R44 |
| 1 | 2N3906 | Package_TO_SOT_THT:TO-92_HandSolder | Q5 |
| 1 | 39K | Resistor_SMD:R_0805_2012Metric | R16 |
| 1 | 3M | Resistor_SMD:R_0805_2012Metric | R13 |
| 1 | 4.7M | Resistor_SMD:R_0805_2012Metric | R40 |
| 1 | 9.1K | Resistor_SMD:R_0805_2012Metric | R24 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J3 |
| 1 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J2 |
| 1 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J1 |
| 1 | Conn_02x05_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | J4 |
| 1 | LM13700 | Package_SO:SOP-16_4.4x10.4mm_P1.27mm | U1 |
| 1 | TL072 | Package_SO:SOP-8_3.9x4.9mm_P1.27mm | U4 |
Questions
How big is the LFO PCB?
It measures 49.8 × 44.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the LFO use?
94 parts, built around the TL082, LM13700M and TL072. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the LFO KiCad files?
From the gehel/synth repository on GitHub, at the commit this page was made from: the board is LFO/LFO/LFO.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the LFO design in my own project?
Its repository states no licence, so its author keeps all rights: ask gehel before reusing the design.
More from gehel/synth
12- 2 layers163.1 × 101.3 mm
- 2 layers131 × 69 mm
- 2 layers
- 4 layers163 × 116.5 mm
- 4 layers46 × 113 mm
- 4 layers68.1 × 53.3 mm
- 4 layers92.7 × 82.3 mm
- 4 layers86.6 × 80 mm
- 4 layers108 × 79 mm
- 4 layers79.8 × 54.4 mm
- 2 layers94.9 × 116.5 mm
Similar boards
- 2 layers106.9 × 101.6 mm
- 2 layers40 × 200 mm
- 2 layers37 × 113.9 mm
- 2 layers27.9 × 101.6 mm
MFOS Eight Stage Phase Shifter - Main
mzuelch/CATs-Eurosynth
Analog Synth Eurorack Modules
105 parts166MIT - 2 layers200.4 × 251.2 mm
- 2 layers80.9 × 108.2 mm
- 2 layers64 × 128.5 mm
MiniVCA 1.0
benjiaomodular/MiniVCA
A small footprint LM13700 VCA module for Eurorack modular synth
42 parts31MIT - 2 layers104 × 158 mm
