Eurorack SSI2131 VCO
Eurorack SSI2131 VCO is an open source PCB design by Len42: a 2-layer, 50.5 × 108.2 mm board with 98 components (44 distinct parts). It is built around the L78L05, L79L05, LM4040, SSI2131 and more. Filed under audio.
Eurorack synthesizer module designs
Here are instructions for calibration of the VCO for proper 1V/octave tracking.
PCB layouts are provided in KiCad and gerber formats. A drilling template is provided for the front panel.
The PCBs that I used can be ordered from OSH Park. The designs are here: - Controls board - Middle board (Note: This is an older version of the PCB. The sub-oscillator circuit does not work on this version.) - Back board
Built around
Parts list
98 components, 44 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | L78L05 STMicroelectronics | TO-92_Inline_Wide | U1 |
| 1 | L79L05 STMicroelectronics | TO-92_Inline_Wide | U2 |
| 1 | LM4040 Texas Instruments | TO-92-2_Wide | U3 |
| 1 | SSI2131 Sound Semiconductor | Breakout_DIP-16_W15.24mm | U4 |
| 3 | TL074 Texas Instruments | DIP-14_W7.62mm | U5, U6, U7 |
| 1 | SN74HCS74 Texas Instruments | Breakout_DIP-SOIC-14_W15.24mm | U8 |
| 8 | WQP-PJ398 QingPu / Thonk | Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical | J1, J2, J3, J4, J5, J6, J7, J8 |
| 1 | CONN_EURORACK_16 Conn_Eurorack_16 Wurth Elektronik | IDC-Header-Eurorack-16-TH | J9 |
| 1 | Conn_Front_Left | PinSocket_1x11_P2.54mm_Vertical | J10 |
| 1 | Conn_Front_Right | PinSocket_1x10_P2.54mm_Vertical | J11 |
| 1 | Conn_Back_Right | PinHeader_1x11_P2.54mm_Vertical | J12 |
| 1 | Conn_Back_Left | PinHeader_1x10_P2.54mm_Vertical | J13 |
| 1 | Conn_Passthru_Right | PinSocket_1x11_P2.54mm_Vertical | J14 |
| 1 | Conn_Passthru_Left | PinSocket_1x10_P2.54mm_Vertical | J15 |
| 1 | Conn_Mid_Right | PinHeader_1x11_P2.54mm_Vertical | J16 |
| 1 | Conn_Mid_Left | PinHeader_1x10_P2.54mm_Vertical | J17 |
| 1 | CV-BUS | PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 5 | 100K Alpha | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV1, RV2, RV3, RV7, RV8 |
| 3 | 5K Bourns | Potentiometer_Bourns_3296W_Vertical | RV9, RV10, RV11 |
| 1 | ON_OFF_ON Mountain Switch | SW_SPDT_THT_2.54 | SW5 |
Show 24 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | 1N5711 STMicroelectronics | D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3 |
| 2 | 10U Panasonic | CP_Radial_D4.0mm_P2.50mm | C1, C2 |
| 9 | 100N TDK | C_Disc_D5.0mm_W2.5mm_P2.50mm | C3, C4, C5, C6, C7, C8, C9, C10 +1 |
| 2 | 10N KEMET | C_Rect_Kemet_L7.2mm_W2.5mm_P5mm | C12, C13 |
| 1 | 3N9 KEMET | C_Rect_Kemet_L7.2mm_W2.5mm_P5mm | C14 |
| 1 | 470R YAGEO | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1 |
| 1 | 4M7 YAGEO | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R2 |
| 4 | 1K Vishay / Dale | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R4, R7, R9 |
| 3 | 100K Vishay / Dale | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5, R6, R17 |
| 6 | 100K YAGEO | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R8, R21, R22, R23, R25, R30 |
| 2 | 150K YAGEO | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R10, R13 |
| 3 | 75K YAGEO | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R11, R12, R24 |
| 1 | 300K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R14 |
| 2 | 125K Vishay / Dale | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R15, R16 |
| 1 | 62K YAGEO | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R18 |
| 2 | 1M5 YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R19, R20 |
| 1 | 270K YAGEO | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R26 |
| 1 | 47K YAGEO | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R27 |
| 1 | 499K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R28 |
| 1 | 270R YAGEO | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R29 |
| 3 | 9K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R31, R33, R35 |
| 8 | 36K YAGEO | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R32, R34, R36, R42, R43, R44, R45, R46 |
| 2 | 18K YAGEO | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R37, R38 |
| 3 | 24K YAGEO | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R39, R40, R41 |
More boards in Synth
Eurorack 4XVCA Module
50.5 × 108.2 mm108 parts2LNo license50
Switches
40.1 × 108.2 mm98 parts2LNo license50
Eurorack Dual LFO
50.5 × 108.2 mm79 parts2LNo license50
Eurorack Dual Mixer
40.3 × 108.2 mm71 parts2LNo license50
Eurorack Noise / S&H Module
50.8 × 106.7 mm70 parts6LNo license50
Eurorack Dual Filter Module
50.3 × 108.2 mm70 parts2LNo license50
Eurorack State-Variable Filter
50.5 × 102.9 mm68 parts2LNo license50
Eurorack 4-Pole Filter
50.3 × 102.6 mm60 parts2LNo license50
Eurorack Wavefolder Module
47.7 × 83 mm59 parts2LNo license50
Eurorack Audiout Module
40.6 × 96.1 mm58 parts2LNo license50
AVR/ArduinoEurorack Dual Envelope Module
40.3 × 108.2 mm57 parts2LNo license50
Similar boards
Simplemixsmall
nickajeglin
42.6 × 80 mm59 parts2LNo license207
Mult
43.7 × 94.2 mm36 parts2LNo license207
Logiverter
40.1 × 107.1 mm74 parts2LNo license207
Vca
45.2 × 146.8 mm79 parts2LNo license207
VCO
37 × 113.9 mm104 parts2LNo license207
Mix
47 × 79.8 mm56 parts2LNo license207