Master
This repository ships a schematic but no board layout.
About the Master PCB
Master is an open source PCB design by plektra, published on GitHub under the Custom license license. It is a 2-layer board, with 697 components from 168 distinct parts.
Other key parts include the NE5532, AD8273, SSI2162SS-TU, TL072 and DG413DY. By type, the board carries 293 resistors, 210 capacitors, 77 diodes, 70 ICs, 16 connectors and 11 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 Master
Master bill of materials (BOM)
697 components, 168 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 18 | NE5532 Texas Instruments | SOIC-8_3.9x4.9mm_P1.27mm | U101, U102, U103, U104, U105, U106, U202, U204 +10 |
| 2 | AD8273 Analog Devices | SOIC-14_3.9x8.7mm_P1.27mm | U201, U301 |
| 4 | SSI2162SS-TU SSI2162 Sound Semiconductor | SSOP-10_3.9x4.9mm_P1.00mm | U203, U303, U401, U701 |
| 20 | TL072 Texas Instruments | SOIC-8_3.9x4.9mm_P1.27mm | U206, U207, U306, U307, U406, U407, U408, U409 +12 |
| 9 | DG413DY Vishay | SOIC-16_3.9x9.9mm_P1.27mm | U208, U209, U308, U309, U413, U506, U507, U508 +1 |
| 1 | AS3046D Alfa | SOIC-14_3.9x8.7mm_P1.27mm | U402 |
| 9 | LM339 Texas Instruments | SOIC-14_3.9x8.7mm_P1.27mm | U411, U412, U707, U805, U806, U807, U808, U809 +1 |
| 1 | DG411DY Vishay | SOIC-16_3.9x9.9mm_P1.27mm | U641 |
| 2 | THAT1646S08-U THAT1646S08 THAT Corporation | SOIC-8_3.9x4.9mm_P1.27mm | U703, U704 |
| 1 | TPA6120A2DWPR TPA6120A2DWP Texas Instruments | SO-20-1EP_7.52x12.825mm_P1.27mm_EP6.045x12.09mm_Mask3.56x4.47mm_ThermalVias | U752 |
| 1 | LM317 Texas Instruments | TO-220-3_Vertical | U901 |
| 1 | LM337 Texas Instruments | TO-220-3_Vertical | U902 |
| 1 | L7805CV L7805 STMicroelectronics | TO-220-3_Vertical | U903 |
| 2 | MMBT3904LT1G MMBT3904 onsemi | SOT-23 | Q501, Q701 |
| 1 | AUDIO CHAIN | IDC-Header_2x17_P2.54mm_Vertical | J101 |
| 1 | NMJ6HCD2 RETURN 1 L/MONO Neutrik | Jack_6.35mm_Neutrik_NMJ6HCD2_Horizontal | J201 |
| 1 | NMJ6HCD2 RETURN 1 R Neutrik | Jack_6.35mm_Neutrik_NMJ6HCD2_Horizontal | J202 |
| 2 | GAIN: fitted -6 dB (PRO), open +6 dB (PEDAL) | PinHeader_2x02_P2.54mm_Vertical | J203, J303 |
| 1 | NMJ6HCD2 RETURN 2 L/MONO Neutrik | Jack_6.35mm_Neutrik_NMJ6HCD2_Horizontal | J301 |
| 1 | NMJ6HCD2 RETURN 2 R Neutrik | Jack_6.35mm_Neutrik_NMJ6HCD2_Horizontal | J302 |
Show 148 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | NMJ6HCD2 SC EXT IN Neutrik | Jack_6.35mm_Neutrik_NMJ6HCD2_Horizontal | J501 |
| 1 | NMJ6HCD2 AUX1 SEND L/MONO Neutrik | Jack_6.35mm_Neutrik_NMJ6HCD2_Horizontal | J601 |
| 1 | NMJ6HCD2 AUX1 SEND R Neutrik | Jack_6.35mm_Neutrik_NMJ6HCD2_Horizontal | J602 |
| 1 | NMJ6HCD2 AUX2 SEND L/MONO Neutrik | Jack_6.35mm_Neutrik_NMJ6HCD2_Horizontal | J621 |
| 1 | NMJ6HCD2 AUX2 SEND R Neutrik | Jack_6.35mm_Neutrik_NMJ6HCD2_Horizontal | J622 |
| 1 | NMJ6HCD2 MAIN OUT L Neutrik | Jack_6.35mm_Neutrik_NMJ6HCD2_Horizontal | J701 |
| 1 | NMJ6HCD2 MAIN OUT R Neutrik | Jack_6.35mm_Neutrik_NMJ6HCD2_Horizontal | J702 |
| 1 | NMJ6HCD2 PHONES Neutrik | Jack_6.35mm_Neutrik_NMJ6HCD2_Horizontal | J751 |
| 1 | POWER IN | IDC-Header_2x04_P2.54mm_Vertical | J901 |
| 2 | TO-220 heatsink <= 10 C/W | HS901, HS902 | |
| 3 | G6K-2F-Y DC12 Omron | Relay_DPDT_Omron_G6K-2F-Y | K701, K702, K751 |
| 1 | RETURN 1 LEVEL 10k lin | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV201 |
| 1 | RETURN 2 LEVEL 10k lin | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV301 |
| 1 | MIX 10k lin dual Alpha | Potentiometer_Alpha_RD902F-40-00D_Dual_Vertical | RV401 |
| 1 | RELEASE 10k rev. log | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV402 |
| 1 | AMOUNT 10k lin | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV403 |
| 1 | SC LPF 100k rev. log dual Alpha | Potentiometer_Alpha_RD902F-40-00D_Dual_Vertical | RV501 |
| 1 | THRESHOLD 10k log | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV502 |
| 1 | DEPTH 10k lin | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV503 |
| 1 | DECAY 500k log | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV504 |
| 1 | AUX1 SEND 10k A dual Alpha | Potentiometer_Alpha_RD902F-40-00D_Dual_Vertical | RV601 |
| 1 | AUX2 SEND 10k A dual Alpha | Potentiometer_Alpha_RD902F-40-00D_Dual_Vertical | RV621 |
| 1 | MASTER 10k lin | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV701 |
| 1 | PHONES 10k A dual Alpha | Potentiometer_Alpha_RD902F-40-00D_Dual_Vertical | RV751 |
| 1 | GPBS850N RETURN 1 MUTE (latching) CW Industries | SW_Latching_8.5x8.5mm_CW_GPBS850N | SW201 |
| 1 | GPBS850N RETURN 1 DUCK (latching) CW Industries | SW_Latching_8.5x8.5mm_CW_GPBS850N | SW202 |
| 1 | GPBS850N RETURN 1 COMP (latching) CW Industries | SW_Latching_8.5x8.5mm_CW_GPBS850N | SW203 |
| 1 | GPBS850N RETURN 2 MUTE (latching) CW Industries | SW_Latching_8.5x8.5mm_CW_GPBS850N | SW301 |
| 1 | GPBS850N RETURN 2 DUCK (latching) CW Industries | SW_Latching_8.5x8.5mm_CW_GPBS850N | SW302 |
| 1 | GPBS850N RETURN 2 COMP (latching) CW Industries | SW_Latching_8.5x8.5mm_CW_GPBS850N | SW303 |
| 1 | GPBS850N COMP ON (latching) CW Industries | SW_Latching_8.5x8.5mm_CW_GPBS850N | SW401 |
| 1 | GPBS850N SC BUS (latching) CW Industries | SW_Latching_8.5x8.5mm_CW_GPBS850N | SW501 |
| 1 | GPBS850N SC LPF BYPASS (latching) CW Industries | SW_Latching_8.5x8.5mm_CW_GPBS850N | SW502 |
| 1 | GPBS850N SC LISTEN (latching) CW Industries | SW_Latching_8.5x8.5mm_CW_GPBS850N | SW503 |
| 1 | GROUND LIFT | SW901 | |
| 23 | 1N4148W | D_SOD-123 | D201, D202, D301, D302, D401, D402, D403, D404 +15 |
| 2 | MUTE LED | LED_0805_2012Metric | D203, D303 |
| 2 | DUCK LED | LED_0805_2012Metric | D204, D304 |
| 2 | COMP LED | LED_0805_2012Metric | D205, D305 |
| 1 | GR 1 dB | LED_D3.0mm | D407 |
| 1 | GR 3 dB | LED_D3.0mm | D408 |
| 1 | GR 6 dB | LED_D3.0mm | D409 |
| 1 | GR 10 dB | LED_D3.0mm | D410 |
| 1 | GR 15 dB | LED_D3.0mm | D411 |
| 1 | COMP ON LED | LED_0805_2012Metric | D412 |
| 1 | SC BUS LED | LED_0805_2012Metric | D501 |
| 1 | SC LPF BYPASS LED | LED_0805_2012Metric | D502 |
| 1 | SC LISTEN LED | LED_0805_2012Metric | D503 |
| 4 | 6V2 | D_SOD-123 | D701, D702, D703, D704 |
| 8 | M7 (1N4007) | D_SMA | D705, D706, D707, D708, D709, D710, D711, D712 |
| 1 | PFL yellow | LED_D3.0mm | D752 |
| 1 | L -30 green | LED_D3.0mm | D805 |
| 1 | L -20 green | LED_D3.0mm | D806 |
| 1 | L -15 green | LED_D3.0mm | D807 |
| 1 | L -10 green | LED_D3.0mm | D808 |
| 1 | L -6 green | LED_D3.0mm | D809 |
| 1 | L -3 green | LED_D3.0mm | D810 |
| 1 | L 0 green | LED_D3.0mm | D811 |
| 1 | L +3 yellow | LED_D3.0mm | D812 |
| 1 | L +6 yellow | LED_D3.0mm | D813 |
| 1 | L +9 yellow | LED_D3.0mm | D814 |
| 1 | L +12 red | LED_D3.0mm | D815 |
| 1 | L CLIP red | LED_D3.0mm | D816 |
| 1 | R -30 green | LED_D3.0mm | D817 |
| 1 | R -20 green | LED_D3.0mm | D818 |
| 1 | R -15 green | LED_D3.0mm | D819 |
| 1 | R -10 green | LED_D3.0mm | D820 |
| 1 | R -6 green | LED_D3.0mm | D821 |
| 1 | R -3 green | LED_D3.0mm | D822 |
| 1 | R 0 green | LED_D3.0mm | D823 |
| 1 | R +3 yellow | LED_D3.0mm | D824 |
| 1 | R +6 yellow | LED_D3.0mm | D825 |
| 1 | R +9 yellow | LED_D3.0mm | D826 |
| 1 | R +12 red | LED_D3.0mm | D827 |
| 1 | R CLIP red | LED_D3.0mm | D828 |
| 2 | SS14 | D_SMA | D905, D906 |
| 19 | 100p C0G | C_0805_2012Metric | C121, C122, C123, C124, C125, C126, C127, C128 +11 |
| 131 | 100n | C_0805_2012Metric | C141, C142, C143, C144, C145, C146, C147, C148 +123 |
| 9 | 220p C0G | C_0805_2012Metric | C201, C202, C203, C204, C301, C302, C303, C304 +1 |
| 16 | 10u bipolar | C_Radial_D5.0mm_H11.0mm_P2.00mm | C205, C206, C209, C210, C305, C306, C309, C310 +8 |
| 4 | 22p C0G | C_0805_2012Metric | C207, C208, C307, C308 |
| 9 | 2n2 C0G | C_0805_2012Metric | C211, C212, C311, C312, C403, C404, C411, C703 +1 |
| 6 | 1u | C_0805_2012Metric | C215, C315, C408, C711, C801, C802 |
| 2 | 220n | C_0805_2012Metric | C409, C410 |
| 1 | 47n C0G | C_0805_2012Metric | C502 |
| 1 | 22n C0G | C_0805_2012Metric | C503 |
| 2 | 2u2 | C_0805_2012Metric | C504, C712 |
| 7 | 10u 25V | CP_Radial_D5.0mm_P2.00mm | C755, C756, C903, C904, C908, C909, C912 |
| 2 | 47u 35V | CP_Radial_D6.3mm_P2.50mm | C901, C906 |
| 1 | 100n 100V | C_0805_2012Metric | C913 |
| 56 | 10k | R_0805_2012Metric | R101, R205, R206, R207, R208, R211, R212, R215 +48 |
| 20 | 22k | R_0805_2012Metric | R111, R112, R113, R114, R115, R116, R117, R118 +12 |
| 26 | 100 | R_0805_2012Metric | R201, R202, R203, R204, R213, R214, R301, R302 +18 |
| 4 | 30k | R_0805_2012Metric | R209, R210, R309, R310 |
| 4 | 14k3 | R_0805_2012Metric | R221, R321, R405, R705 |
| 3 | 113k | R_0805_2012Metric | R222, R322, R714 |
| 4 | 453k | R_0805_2012Metric | R223, R323, R443, R715 |
| 33 | 100k | R_0805_2012Metric | R224, R227, R232, R237, R239, R241, R324, R327 +25 |
| 3 | 221k | R_0805_2012Metric | R225, R325, R717 |
| 3 | 63k4 | R_0805_2012Metric | R226, R326, R718 |
| 3 | 124k | R_0805_2012Metric | R228, R328, R720 |
| 3 | 8k66 | R_0805_2012Metric | R229, R329, R721 |
| 2 | 33k2 | R_0805_2012Metric | R231, R331 |
| 2 | 15k8 | R_0805_2012Metric | R233, R333 |
| 10 | 12k | R_0805_2012Metric | R236, R238, R240, R336, R338, R340, R454, R522 +2 |
| 4 | 20k | R_0805_2012Metric | R416, R501, R502, R514 |
| 1 | 10M | R_0805_2012Metric | R418 |
| 3 | 2k2 | R_0805_2012Metric | R419, R902, R904 |
| 1 | 560k | R_0805_2012Metric | R420 |
| 1 | ERA-V33J102V 1k +3300 ppm/K Panasonic | R_0805_2012Metric | R421 |
| 1 | 11k | R_0805_2012Metric | R422 |
| 2 | 470 | R_0805_2012Metric | R423, R519 |
| 2 | 2M2 | R_0805_2012Metric | R424, R431 |
| 1 | 620 | R_0805_2012Metric | R425 |
| 1 | 140k | R_0805_2012Metric | R426 |
| 1 | 3M3 | R_0805_2012Metric | R432 |
| 2 | 1M | R_0805_2012Metric | R433, R728 |
| 17 | 1k | R_0805_2012Metric | R434, R448, R710, R711, R712, R713, R727, R752 +9 |
| 1 | 75k | R_0805_2012Metric | R435 |
| 2 | 68k | R_0805_2012Metric | R437, R438 |
| 1 | 33k | R_0805_2012Metric | R439 |
| 1 | 5k1 | R_0805_2012Metric | R444 |
| 1 | 4k02 | R_0805_2012Metric | R445 |
| 1 | 3k | R_0805_2012Metric | R446 |
| 1 | 2k | R_0805_2012Metric | R447 |
| 30 | 1k5 | R_0805_2012Metric | R449, R450, R451, R452, R453, R762, R824, R825 +22 |
| 3 | 200 | R_0805_2012Metric | R515, R901, R903 |
| 1 | 27k | R_0805_2012Metric | R518 |
| 12 | 47k | R_0805_2012Metric | R601, R602, R603, R604, R605, R606, R621, R622 +4 |
| 3 | 4k7 | R_0805_2012Metric | R708, R709, R729 |
| 1 | 6k8 | R_0805_2012Metric | R725 |
| 3 | 330 | R_0805_2012Metric | R730, R731, R761 |
| 2 | 51 | R_0805_2012Metric | R751, R755 |
| 2 | 39R2 | R_2512_6332Metric | R754, R758 |
| 2 | 680k | R_0805_2012Metric | R805, R810 |
| 1 | 115k | R_0805_2012Metric | R811 |
| 1 | 13k3 | R_0805_2012Metric | R812 |
| 1 | 31k6 | R_0805_2012Metric | R813 |
| 1 | 22k6 | R_0805_2012Metric | R814 |
| 1 | 16k2 | R_0805_2012Metric | R815 |
| 1 | 11k3 | R_0805_2012Metric | R816 |
| 1 | 8k06 | R_0805_2012Metric | R817 |
| 1 | 5k62 | R_0805_2012Metric | R818 |
| 1 | 5k11 | R_0805_2012Metric | R819 |
| 1 | 3k83 | R_0805_2012Metric | R820 |
| 1 | 2k15 | R_0805_2012Metric | R821 |
| 1 | 1k87 | R_0805_2012Metric | R822 |
| 1 | 866 | R_0805_2012Metric | R823 |
Master design files
The KiCad project lives in the plektra/syntsamix repository on GitHub; these links point at the commit this page was built from.
Master: common questions
How big is the Master PCB?
The Master has 2 copper layers and is 1.6 mm thick.
How many components are on the Master?
697 components, from 168 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 Master 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 Master 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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