2 layers167.1 × 363.5 mm
2 layers70.2 × 99.5 mm
Low pass filter
gridbugs/modular2- Size
- 70.2 × 99.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 48
- Nets
- 36
- Pads
- 135
- Tracks, vias
- 259, 0
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 22 Nov 2025
- Updated
- 7 Nov 2026
Overview
Low pass filter is an open-source printed circuit board by gridbugs, from the gridbugs/modular2 repository on GitHub, published under the MIT licence. It is a 2-layer board of 70.2 × 99.5 mm with 48 parts on 36 nets, routed with 259 tracks and 0 vias.
It is built around the LM13700M. Its parts include 17 resistors, 9 connectors, 8 capacitors, 4 fuses and 2 ICs.
Main components
1README
low-pass-filter/README.mdLow-pass Filter
Quirks
V1
- The "Cutoff" potentiometer is reversed.
Parts
48| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R6, R7, R8, R10, R12 |
| 4 | 100nf | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C2, C7, C8 |
| 4 | 220R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R5, R9, R11 |
| 4 | foot | modular2:foot | F1, F2, F3, F4 |
| 3 | Pot | modular2:pot | J3, J6, J9 |
| 3 | Power | Connector_IDC:IDC-Header_2x03_P2.54mm_Vertical | J1, J2, J8 |
| 2 | 100K | modular2:pot-socket | RV1, RV2 |
| 2 | 100k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R16, R17 |
| 2 | 1k8 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4, R15 |
| 2 | 1nf | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C3, C6 |
| 2 | LED | LED_THT:LED_D5.0mm | D1, D2 |
| 2 | PNP (e.g. BC558) | Package_TO_SOT_THT:TO-92 | Q1, Q2 |
| 1 | 4.7nf | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C5 |
| 1 | 470k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R14 |
| 1 | 470nf | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C4 |
| 1 | 4k7 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R13 |
| 1 | 5K | modular2:pot-socket | RV3 |
| 1 | CV | modular2:banana-jack | J4 |
| 1 | Input | modular2:banana-jack | J7 |
| 1 | LM13700 | Package_DIP:DIP-16_W7.62mm_Socket | U1 |
| 1 | LOGO | modular2:ibis-small | G*** |
| 1 | Output | modular2:banana-jack | J5 |
| 1 | TL074 | Package_DIP:DIP-14_W7.62mm_Socket | U2 |
Questions
How big is the Low pass filter PCB?
It measures 70.2 × 99.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Low pass filter use?
48 parts, built around the LM13700M. 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 Low pass filter KiCad files?
From the gridbugs/modular2 repository on GitHub, at the commit this page was made from: the board is low-pass-filter/low-pass-filter.kicad_pcb and its schematic arduino-delay/arduino-delay.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Low pass filter design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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