Channel card
About the Channel card PCB
Channel card is an open source PCB design by plektra, published on GitHub under the Custom license license. It is a 2-layer board, with 331 components from 112 distinct parts.
Other key parts include the SSI2144, TL072, NE5532, DG413DY and SSI2144SS-TU. By type, the board carries 140 resistors, 99 capacitors, 33 diodes, 30 ICs, 8 connectors and 7 switches.
It belongs with the audio designs in this gallery.
From the project
Analog mixer for synthesizers
A modular, analog stereo mixer for live electronic music: synthesizers, drum machines and Eurorack modular gear on one desk, with a resonant ladder filter on every channel and a compressor built for bass pumping.
- Made for playing live. Few controls, each with an obvious musical effect; the mixer is part of the performance, not only a utility. - Modular. Identical stereo channel cards, added one at a time from 1 to 16. No card depends on another, and there is no backplane: cards are daisy-chained by ribbon cables, with the master card at one end. - Synth-friendly inputs. Balanced inputs…
Main components on the Channel card
Channel card bill of materials (BOM)
331 components, 112 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SSI2144 AD8273 Analog Devices | SOIC-14_3.9x8.7mm_P1.27mm | U1 |
| 1 | TL072 NE5532 | SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 8 | NE5532 Texas Instruments | SOIC-8_3.9x4.9mm_P1.27mm | U3, U104, U105, U106, U107, U202, U203, U301 |
| 4 | DG413DY Vishay | SOIC-16_3.9x9.9mm_P1.27mm | U4, U108, U206, U302 |
| 2 | SSI2144SS-TU SSI2144 Sound Semiconductor | QSOP-16_3.9x4.9mm_P0.635mm | U101, U102 |
| 1 | LM13700 Texas Instruments | SOIC-16_3.9x9.9mm_P1.27mm | U103 |
| 1 | SSI2162SS-TU SSI2162 Sound Semiconductor | SSOP-10_3.9x4.9mm_P1.00mm | U201 |
| 6 | TL072 Texas Instruments | SOIC-8_3.9x4.9mm_P1.27mm | U204, U205, U401, U402, U403, U404 |
| 1 | DG412DY Vishay | SOIC-16_3.9x9.9mm_P1.27mm | U303 |
| 2 | LM339 Texas Instruments | SOIC-14_3.9x8.7mm_P1.27mm | U405, U406 |
| 1 | LM317 Texas Instruments | TO-220-3_Vertical | U501 |
| 1 | LM337 Texas Instruments | TO-220-3_Vertical | U502 |
| 1 | L78L05ACUTR 78L05 STMicroelectronics | SOT-89-3 | U503 |
| 1 | MMBT3904LT1G MMBT3904 onsemi | SOT-23 | Q301 |
| 1 | INPUT MODULE Molex | Molex_KK-254_AE-6410-10A_1x10_P2.54mm_Vertical | J1 |
| 1 | CUTOFF CV 1 V/oct | J181 | |
| 1 | AUX1 PRE 1-3/2-4, POST 3-5/4-6 | PinHeader_2x03_P2.54mm_Vertical | J301 |
| 1 | AUX2 PRE 1-3/2-4, POST 3-5/4-6 | PinHeader_2x03_P2.54mm_Vertical | J302 |
| 1 | AUDIO IN | IDC-Header_2x17_P2.54mm_Vertical | J501 |
| 1 | AUDIO OUT | IDC-Header_2x17_P2.54mm_Vertical | J502 |
Show 92 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | POWER IN | IDC-Header_2x04_P2.54mm_Vertical | J503 |
| 1 | POWER OUT | IDC-Header_2x04_P2.54mm_Vertical | J504 |
| 2 | DRIVE: fit both = MEDIUM | PinHeader_2x02_P2.54mm_Vertical | JP101, JP151 |
| 2 | Q COMP: 1-2 HALF, 2-3 FULL | PinHeader_1x03_P2.54mm_Vertical | JP102, JP152 |
| 1 | TRIM 250k A Alpha | Potentiometer_Alpha_RD902F-40-00D_Dual_Vertical | RV1 |
| 2 | 3296W-1-503LF 50k CUTOFF OFFSET Bourns | Potentiometer_Bourns_3296W_Vertical | RV101, RV151 |
| 1 | 50k lin CUTOFF | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV181 |
| 1 | 3296W-1-503LF 50k V/OCT Bourns | Potentiometer_Bourns_3296W_Vertical | RV182 |
| 1 | 10k rev. audio RESONANCE | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV183 |
| 1 | PTA6043-2015DPB103 10k lin FADER Bourns | Potentiometer_Bourns_PTA6043_Single_Slide | RV201 |
| 1 | AUX1 10k A dual Alpha | Potentiometer_Alpha_RD902F-40-00D_Dual_Vertical | RV301 |
| 1 | AUX2 10k A dual Alpha | Potentiometer_Alpha_RD902F-40-00D_Dual_Vertical | RV302 |
| 1 | GPBS850N LOW-CUT (latching) CW Industries | SW_Latching_8.5x8.5mm_CW_GPBS850N | SW1 |
| 1 | GPBS850N FILTER BYPASS (latching) CW Industries | SW_Latching_8.5x8.5mm_CW_GPBS850N | SW181 |
| 1 | GPBS850N MUTE (latching) CW Industries | SW_Latching_8.5x8.5mm_CW_GPBS850N | SW201 |
| 1 | GPBS850N DUCK (latching) CW Industries | SW_Latching_8.5x8.5mm_CW_GPBS850N | SW202 |
| 1 | GPBS850N PFL (latching) CW Industries | SW_Latching_8.5x8.5mm_CW_GPBS850N | SW301 |
| 1 | GPBS850N SC SEND (latching) CW Industries | SW_Latching_8.5x8.5mm_CW_GPBS850N | SW302 |
| 1 | GPBS850N COMP BUS (latching) CW Industries | SW_Latching_8.5x8.5mm_CW_GPBS850N | SW303 |
| 4 | 6V2 | D_SOD-123 | D1, D2, D3, D4 |
| 1 | LOW-CUT LED | LED_0805_2012Metric | D5 |
| 12 | 1N4148W | D_SOD-123 | D181, D182, D201, D202, D401, D402, D403, D404 +4 |
| 1 | BYPASS LED | LED_0805_2012Metric | D183 |
| 1 | MUTE LED | LED_0805_2012Metric | D203 |
| 1 | DUCK LED | LED_0805_2012Metric | D204 |
| 1 | PFL LED | LED_0805_2012Metric | D301 |
| 1 | SC SEND LED | LED_0805_2012Metric | D302 |
| 1 | COMP BUS LED | LED_0805_2012Metric | D303 |
| 1 | -30 green | LED_D3.0mm | D411 |
| 1 | -20 green | LED_D3.0mm | D412 |
| 1 | -10 green | LED_D3.0mm | D413 |
| 1 | -5 green | LED_D3.0mm | D414 |
| 1 | 0 green | LED_D3.0mm | D415 |
| 1 | +3 yellow | LED_D3.0mm | D416 |
| 1 | +6 yellow | LED_D3.0mm | D417 |
| 1 | CLIP red | LED_D3.0mm | D418 |
| 2 | SS14 | D_SMA | D505, D506 |
| 4 | 220p C0G | C_0805_2012Metric | C1, C2, C3, C4 |
| 8 | 10u bipolar | C_Radial_D5.0mm_H11.0mm_P2.00mm | C5, C6, C101, C107, C151, C157, C221, C271 |
| 3 | 22p C0G | C_0805_2012Metric | C7, C8, C181 |
| 4 | 47n film | C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C9, C10, C11, C12 |
| 57 | 100n | C_0805_2012Metric | C13, C14, C15, C16, C17, C18, C19, C20 +49 |
| 6 | 6n8 C0G | C_0805_2012Metric | C102, C103, C104, C152, C153, C154 |
| 2 | 560p C0G | C_0805_2012Metric | C105, C155 |
| 4 | 100p C0G | C_0805_2012Metric | C106, C156, C223, C273 |
| 2 | 2n2 C0G | C_0805_2012Metric | C222, C272 |
| 2 | 1u | C_0805_2012Metric | C224, C401 |
| 2 | 47u 35V | CP_Radial_D6.3mm_P2.50mm | C501, C506 |
| 5 | 10u 25V | CP_Radial_D5.0mm_P2.00mm | C503, C504, C508, C509, C512 |
| 6 | 100 | R_0805_2012Metric | R1, R2, R3, R4, R202, R252 |
| 23 | 10k | R_0805_2012Metric | R5, R6, R101, R102, R114, R151, R152, R164 +15 |
| 3 | 2k | R_0805_2012Metric | R7, R8, R412 |
| 2 | 4k7 | R_0805_2012Metric | R9, R10 |
| 2 | 24k | R_0805_2012Metric | R11, R13 |
| 2 | 47k | R_0805_2012Metric | R12, R14 |
| 19 | 100k | R_0805_2012Metric | R15, R16, R17, R110, R112, R121, R160, R162 +11 |
| 7 | 12k | R_0805_2012Metric | R18, R185, R219, R221, R312, R314, R316 |
| 2 | 16k9 | R_0805_2012Metric | R103, R153 |
| 6 | 17k4 | R_0805_2012Metric | R104, R117, R119, R154, R167, R169 |
| 6 | 200 | R_0805_2012Metric | R105, R106, R155, R156, R501, R503 |
| 2 | 13k | R_0805_2012Metric | R107, R157 |
| 2 | ERA-V33J102V 1k +3300ppm Panasonic | R_0603_1608Metric | R108, R158 |
| 2 | 470k | R_0805_2012Metric | R109, R159 |
| 3 | 8k66 | R_0805_2012Metric | R111, R161, R214 |
| 2 | 6k04 | R_0805_2012Metric | R113, R163 |
| 4 | 604 | R_0805_2012Metric | R115, R116, R165, R166 |
| 2 | 52k3 | R_0805_2012Metric | R118, R168 |
| 2 | 41k2 | R_0805_2012Metric | R120, R170 |
| 1 | 301k | R_0805_2012Metric | R181 |
| 1 | 162k | R_0805_2012Metric | R183 |
| 1 | 14k3 | R_0805_2012Metric | R206 |
| 1 | 113k | R_0805_2012Metric | R207 |
| 1 | 453k | R_0805_2012Metric | R208 |
| 1 | 221k | R_0805_2012Metric | R210 |
| 1 | 63k4 | R_0805_2012Metric | R211 |
| 1 | 124k | R_0805_2012Metric | R213 |
| 1 | 33k2 | R_0805_2012Metric | R216 |
| 1 | 15k8 | R_0805_2012Metric | R218 |
| 8 | 22k | R_0805_2012Metric | R301, R302, R303, R304, R307, R308, R309, R310 |
| 2 | 44k2 | R_0805_2012Metric | R305, R306 |
| 4 | 1k | R_0805_2012Metric | R405, R406, R407, R408 |
| 1 | 680k | R_0805_2012Metric | R409 |
| 1 | 19k1 | R_0805_2012Metric | R410 |
| 1 | 4k02 | R_0805_2012Metric | R411 |
| 1 | 1k43 | R_0805_2012Metric | R413 |
| 1 | 1k54 | R_0805_2012Metric | R414 |
| 1 | 845 | R_0805_2012Metric | R415 |
| 1 | 750 | R_0805_2012Metric | R416 |
| 1 | 237 | R_0805_2012Metric | R417 |
| 1 | 110 | R_0805_2012Metric | R418 |
| 8 | 1k5 | R_0805_2012Metric | R419, R420, R421, R422, R423, R424, R425, R426 |
| 2 | 2k2 | R_0805_2012Metric | R502, R504 |
Channel card design files
The KiCad project lives in the plektra/syntsamix repository on GitHub; these links point at the commit this page was built from.
Channel card: common questions
How big is the Channel card PCB?
The Channel card has 2 copper layers and is 1.6 mm thick.
How many components are on the Channel card?
331 components, from 112 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Channel card design files?
From the plektra/syntsamix repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Channel card design in my own project?
It is published under Custom license, which limits how it may be reused; read the license before building on it.
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