2 layers167.1 × 363.5 mm
2 layers60 × 80.2 mm
Envelope generator
gridbugs/modular2- Size
- 60 × 80.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 35
- Nets
- 23
- Pads
- 87
- Tracks, vias
- 176, 0
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 22 Nov 2025
- Updated
- 7 Nov 2026
Overview
Envelope generator 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 60 × 80.2 mm with 35 parts on 23 nets, routed with 176 tracks and 0 vias.
It is built around the TL072. Its parts include 9 resistors, 6 diodes, 6 connectors, 4 capacitors and 4 fuses.
Main components
1README
low-pass-filter/README.mdLow-pass Filter
Quirks
V1
- The "Cutoff" potentiometer is reversed.
Parts
35| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R3, R4, R5 |
| 4 | foot | modular2:foot | F1, F2, F3, F4 |
| 3 | D | Diode_THT:D_A-405_P7.62mm_Horizontal | D1, D2, D3 |
| 2 | 100nF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C3, C4 |
| 2 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8, R9 |
| 2 | 47K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R6 |
| 2 | Pot | modular2:pot | J3, J4 |
| 2 | Power | Connector_IDC:IDC-Header_2x03_P2.54mm_Vertical | J1, J2 |
| 2 | ~ | Diode_THT:D_A-405_P7.62mm_Horizontal | D4, D6 |
| 1 | 10uF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C2 |
| 1 | 1M | modular2:pot-socket | RV2 |
| 1 | 250K | modular2:pot-socket | RV1 |
| 1 | 47nF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C1 |
| 1 | 5.1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7 |
| 1 | AR/D Switch | modular2:switch2 | SW2 |
| 1 | Gate Button | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | SW1 |
| 1 | Gate Input | modular2:banana-jack | J5 |
| 1 | LED | LED_THT:LED_D5.0mm | D5 |
| 1 | LOGO | modular2:ibis-small | G*** |
| 1 | Output | modular2:banana-jack | J7 |
| 1 | TL072 | Package_DIP:DIP-8_W7.62mm_Socket | U1 |
Questions
How big is the Envelope generator PCB?
It measures 60 × 80.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Envelope generator use?
35 parts, built around the 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 Envelope generator KiCad files?
From the gridbugs/modular2 repository on GitHub, at the commit this page was made from: the board is envelope-generator/envelope-generator.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 Envelope generator 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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