Eurorack Dual Envelope Module
Eurorack Dual Envelope Module is an open source AVR/Arduino PCB design by Len42: a 2-layer, 40.3 × 108.2 mm board with 57 components (26 distinct parts). It is built around the ATmega328P-PU, MCP4822, TL072, DG413. Filed under audio.
Eurorack synthesizer module designs
An Arduino-compatible ATmega328P microcontroller generates the envelopes. The firmware source code is in firmware/Envelope2/Envelope2.ino. MakeLookupTables is a program that generates data tables used in the firmware. See here for info about programming the firmware onto the microcontroller chip.
PCB layouts are provided in KiCad and gerber formats. A front panel design is included as a drilled PCB layout (with no labels or graphics).
Built around
Parts list
57 components, 26 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATmega328P-PU Microchip | DIP-28_W7.62mm | U1 |
| 1 | MCP4822 Microchip | DIP-8_W7.62mm_LongPads | U2 |
| 1 | TL072 Texas Instruments | DIP-8_W7.62mm_LongPads | U3 |
| 1 | DG413 Renesas / Intersil | DIP-16_W7.62mm_LongPads | U4 |
| 1 | 16MHz Murata | Resonator_muRata_CSTLSxxxX-3Pin_W5.5mm_H3.0mm | Y1 |
| 4 | WQP-PJ398 QingPu / Thonk | Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical | J1, J2, J3, J4 |
| 1 | Conn_Front_Left_Top Samtec | PinSocket_1x11_P2.54mm_Vertical | J5 |
| 1 | Conn_Back_Right_Top Amphenol FCI | PinHeader_1x11_P2.54mm_Vertical | J6 |
| 1 | Conn_Front_Right Gravitech | PinSocket_1x08_P2.54mm_Vertical | J7 |
| 1 | Conn_Back_Left Amphenol FCI | PinHeader_1x08_P2.54mm_Vertical | J8 |
| 1 | Conn_Eurorack_16 Wurth Elektronik | IDC-Header-Eurorack-16-TH | J9 |
| 1 | FTDI Amphenol FCI | PinHeader_1x06_P2.54mm_Vertical | J10 |
| 1 | GATE-BUS Amphenol FCI | PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 8 | 100K Alpha | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV1, RV2, RV3, RV4, RV5, RV6, RV7, RV8 |
| 2 | SPDT Mountain Switch | SW_SPDT_THT_2.54 | SW1, SW2 |
| 2 | LED_5mm_Blue VCC | LED_D5.0mm | D3, D5 |
| 4 | 1N5711 STMicroelectronics | D_DO-35_SOD27_P7.62mm_Horizontal | D9, D10, D11, D12 |
| 3 | 10U Panasonic | CP_Radial_D5.0mm_P2.50mm | C1, C2, C5 |
| 7 | 100N TDK | C_Disc_D5.0mm_W2.5mm_P2.50mm | C3, C4, C6, C7, C8, C9, C10 |
| 2 | 3N3 KEMET | C_Rect_Kemet_L7.2mm_W2.5mm_P5mm | C11, C12 |
Show 6 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 270R YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R4 |
| 1 | 10K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5 |
| 2 | 24K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8, R9 |
| 4 | 47K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R10, R11, R12, R13 |
| 2 | 51R YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R14, R15 |
| 2 | 100K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R16, R17 |
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