Eurorack 4-Pole Filter
Eurorack 4-Pole Filter is an open source PCB design by Len42: a 2-layer, 50.3 × 102.6 mm board with 60 components (28 distinct parts). It is built around the SSI2140, TL074, TL072. Filed under audio.
Eurorack synthesizer module designs
A low-pass filter using the SSI2140 chip
The SSI2140 VCF chip comes in an SSOP package that I cannot solder, but fortunately it's also available pre-soldered to a breakout board - that's what I use here.
The filter capacitors C8-C11 are specified as high-stability types. Traditionally, polystyrene caps would be used, but those are hard to come by these days (hardly anyone makes them any more) so I've chosen PPS film caps. Ordinary polyester film caps might be OK, or audio-grade ceramics (C0G/NP0 type).
Built around
Parts list
60 components, 28 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SSI2140 Sound Semiconductor | Breakout_DIP-20_W15.24mm | U1 |
| 1 | TL074 Texas Instruments | DIP-14_W7.62mm | U2 |
| 1 | TL072 Texas Instruments | DIP-8_W7.62mm | U3 |
| 5 | WQP-PJ398 QingPu / Thonk | Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical | J1, J3, J5, J7, J8 |
| 1 | CONN_EURORACK_16 Conn_Eurorack_16 Wurth Elektronik | IDC-Header-Eurorack-16-TH | J9 |
| 1 | Conn_PCB_Front | PinSocket_1x08_P2.54mm_Vertical | J12 |
| 1 | Conn_PCB_Back | PinHeader_1x08_P2.54mm_Vertical | J13 |
| 1 | CV-BUS | PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 2 | 100K Alpha | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV1, RV7 |
| 2 | 100K Song Huei | Potentiometer_SongHuei_Single_Vertical | RV2, RV8 |
| 2 | 10K Bourns | Potentiometer_Bourns_3296P_Horizontal | RV9, RV10 |
| 2 | 10U Panasonic | CP_Radial_D5.0mm_P2.50mm | C1, C2 |
| 4 | 100N TDK | C_Disc_D5.0mm_W2.5mm_P2.50mm | C3, C4, C5, C6 |
| 1 | 10U Panasonic | C_Radial_L11.0mm_D5.0mm_P2.50mm_Horiz | C7 |
| 4 | 1N KEMET | C_Rect_Kemet_L7.2mm_W2.5mm_P5mm | C8, C9, C10, C11 |
| 8 | 100K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R19, R20, R21, R26, R27, R28, R30 |
| 1 | 36K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 24K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 1K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 8 | 10K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5, R7, R8, R10, R11, R13, R14, R16 |
Show 8 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | 200R YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6, R9, R12, R15 |
| 1 | 240K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R17 |
| 1 | 200K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R18 |
| 1 | 20K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R22 |
| 1 | 30K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R23 |
| 2 | 160K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R24, R29 |
| 1 | 1K Vishay / Dale | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R25 |
| 1 | 33K YAGEO | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R31 |
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