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2 layers200 × 100 mmPolykit x monosynth, the printed circuit board in 3D

Polykit x monosynth

polykit/polykit-x-monosynth94

The Polykit X1 is a DIY semi-modular, analog, patchable synthesizer

Open in PCBKitView on GitHub.kicad_pcb
Size
200 × 100 mm
Copper layers
2
Thickness
1.6 mm
Parts
167
Nets
132
Pads
486
Tracks, vias
913, 337
Pours
2
Routed
Yes
KiCad
KiCad 6 (file 20211014)
Created
10 Aug 2022
Updated
24 Dec 2023

Overview

Polykit x monosynth is an open-source printed circuit board by polykit, from the polykit/polykit-x-monosynth repository on GitHub. It is a 2-layer board of 200 × 100 mm with 167 parts on 132 nets, routed with 913 tracks and 337 vias.

It is built around the TL072, BAS85 and BC847, with the US1G and BC857 among its other parts. Its parts include 54 resistors, 26 connectors, 15 diodes, 14 capacitors and 9 ICs. It belongs with the audio and music boards of this library.

Main components

5

README

README.md

Polykit X1 Semi Modular Synthesizer

This repository contains schematics, PCB layout files and front panel for an analog, semi modular, patchable synthesizer. It is an interface that works in conjunction with my voice card https://github.com/polykit/polykit-x-voice-card

Specs of the voice card:

  • a VCO with saw, pulse and triangle signal
  • an envelope generator
  • a multimode filter with 8 different filter responses
  • an external input
  • and a panning stereo output

See voice card repository for a full feature list.

Specs of the semi modular interface:

  • a LFO where the waveform can be blended between triangle and pulse signal
  • a wave folder
  • a two channel mixer where one input can be attenuated
  • an additional attenuator
  • a buffered multiple
  • different offset voltages
  • and a power supply
  • 3D printable case

Video playlist on its functionality and design process: https://www.youtube.com/watch?v=2grRbG7IwDw&list=PLUKLEU8jmlbHH4_13YZM0MI6ez4gYQPfy

Polykit X1 Semi Modular Synthesizer

Polykit X1 Semi Modular Synthesizer Rendering

Polykit X1 Semi Modular Synthesizer Case

Gerber files can be found here, front panel files are located here.

BOM

RefQntyValueNameDescription
C1, C221000uFC_PolarizedElectrolytic capacitor
C3, C42100uFC_PolarizedElectrolytic capacitor
C5, C6210uFC_PolarizedElectrolytic capacitor
C7, C821uFC_PolarizedElectrolytic capacitor
C912u2 non-polarizedCFilm or ceramic capacitor
C10, C11, C12, C13, C145100nCCeramic capacitor
D11LEDLEDLight emitting diode
D2, D32US1GUS1G400V, 1A, General Purpose Rectifier Diode, SMA(DO-214AC)
D4, D6, D7, D8, D9, D10, D11, D12, D13, D14, D1511BAS85D_SchottkySchottky diode
D51Dual LEDLED_Dual_BidirectionalDual LED, bidirectional
J11OUT LEFTAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J21OUT RIGHTAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J31ADSR_OUTAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J41GATEAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J51TRIGGERAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J61Conn_01x36Conn_01x36Pinheader, 01x36
J7112V ACJack-DCBarrel Jack Socket, 12V AC/AC 1A wall wart power supply is needed
J81LFOAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J91PAN_CVAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J101PWM CVAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J111RES CVAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J121FREQ CVAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J131PITCH CV 1V/OCTAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J141EXT INAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J151VCA CVAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J161HARD SYNCAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J171SOFT SYNCAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J181FMAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J191MULTAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J201WAVE INAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J211ATT IN (+5V)AudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J221MULT1AudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J231MULT2AudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J241ATT OUTAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J251MIX IN2Can be used as default input for MIX2 when not patched
J261MIX IN1 (-5V)AudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J271MIX IN2AudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J281WAVE OUTAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J291MIX OUTAudioJack2_SwitchTAudio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
Q1, Q32BC847BC8470.1A Ic, 45V Vce, NPN Transistor, SOT-23
Q21BC857BC8570.1A Ic, 45V Vce, PNP Transistor, SOT-23
R1, R18, R19, R47, R50510kRResistor
R2, R3, R4, R5, R20, R21, R45, R46, R54, R58101kRResistor
R101100RResistor
R11, R12, R13, R15, R22, R23, R24, R25, R27, R28, R29, R30, R31, R32, R33, R34, R35, R36, R37, R38, R39, R40, R41, R43, R44, R51, R52, R53, R55, R56, R5731100kRResistor
R141220kRResistor
R16115kRResistor
R17, R48, R49312kRResistor
R26147kRResistor
R421470kRResistor
RV11B100k LEVEL1R_POT-DevicePotentiometer RK097 Vertical
RV21B100k LEVEL2R_POT-DevicePotentiometer RK097 Vertical
RV3110k LFO TRIMR_Potentiometer_TrimTrim-potentiometer
RV41B1M LFO RATER_POT-DevicePotentiometer RK097 Vertical
RV51B100k LFO WAVER_POT-DevicePotentiometer RK097 Vertical
RV61B100k PANNINGR_POT-DevicePotentiometer RK097 Vertical
RV71B100k AR_POT-DevicePotentiometer RK097 Vertical
RV81B100k DR_POT-DevicePotentiometer RK097 Vertical
RV91B100k SR_POT-DevicePotentiometer RK097 Vertical
RV101B100k RR_POT-DevicePotentiometer RK097 Vertical
RV111B100k RESR_POT-DevicePotentiometer RK097 Vertical
RV121B100k FREQR_POT-DevicePotentiometer RK097 Vertical
RV131B100k PWMR_POT-DevicePotentiometer RK097 Vertical
RV141B100k TUNER_POT-DevicePotentiometer RK097 Vertical
RV151B100k ATTR_POT-DevicePotentiometer RK097 Vertical
RV161B100k MIX IN1 LEVELR_POT-DevicePotentiometer RK097 Vertical
SW11EXT_ONSW_SPDTSwitch, single pole double throw
SW21FILTER_ASW_SPDTSwitch, single pole double throw
SW31FILTER_BSW_SPDTSwitch, single pole double throw
SW41FILTER_CSW_SPDTSwitch, single pole double throw
SW51RES_MODESW_SPDT_MSMSwitch, single pole double throw, center OFF position
SW61FREQ_MODESW_SPDT_MSMSwitch, single pole double throw, center OFF position
SW71SAW_TRIANGLESW_SPDTSwitch, single pole double throw
U11MC78M12_TO25278M12 TO-252Positive 500mA 35V Linear Regulator, Fixed Output 5V, TO-252 (D-PAK)
U21MC79M12_TO25279M12 TO-252Negative 500mA 35V Linear Regulator, Fixed Output -12V, TO-252 (D-PAK)
U31L78L05_SO878L05 SO-8Positive 100mA 30V Linear Regulator, Fixed Output 5V, SO-8
U41L79L05_SO879L05 SO-8Negative 100mA -30V Linear Regulator, Fixed Output -5V, SO-8
U5, U6, U7, U84TL074TL074Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14
U91TL072TL072Dual Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8

Tuning

See voice card repository for details on tuning. Additional male/female dupont cables are needed in order to get access to the trimpots. Minimal set of connections are ground, all four voltages, PITCH, PWM, ADSR_*, GATE, LVL2, FREQ_CV and outputs.

Modifications

SAW output of the oscillator can be added to MIX IN2 default input via a 1k resistor, eg. by tapping into the signal between R1 and U6 pin 8 on the voice card.

References

Voice Card: https://github.com/polykit/polykit-x-voice-card

Footprints: https://github.com/polykit/kicad

Wavefolder: https://www.elby-designs.com/webtek/cgs/cgs52/cgs52_folder.html

Parts

167
QtyValueFootprintReferences
31100kResistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolderR11, R12, R13, R15, R22, R23, R24, R25, R27, R28, R29, R30, R31, R32, R33, R34 +15
16LOGOPolykit:blitz-silk-supertinyG***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***
11BAS85Diode_SMD:D_MiniMELFD4, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15
101kResistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolderR2, R3, R4, R5, R20, R21, R45, R46, R54, R58
5100nCapacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolderC10, C11, C12, C13, C14
510kResistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolderR1, R18, R19, R47, R50
4TL074Package_SO:SO-14_3.9x8.65mm_P1.27mmU5, U6, U7, U8
312kResistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolderR17, R48, R49
21000uFCapacitor_SMD:CP_Elec_10x10C1, C2
2100uFCapacitor_SMD:CP_Elec_6.3x7.7C3, C4
210uFCapacitor_SMD:CP_Elec_4x5.8C5, C6
21uFCapacitor_SMD:CP_Elec_4x5.4C7, C8
2BC847Package_TO_SOT_SMD:SOT-23Q1, Q3
2LOGOPolykit:star-silk-tinyG***, G***
2US1GDiode_SMD:D_SMAD2, D3
1100Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolderR10
110k LFO TRIMPotentiometer_SMD:Potentiometer_Bourns_3314J_VerticalRV3
112V ACConnector_BarrelJack:BarrelJack_HorizontalJ7
115kResistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolderR16
1220kResistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolderR14
12u2 NPCapacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolderC9
1470kResistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolderR42
147kResistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolderR26
1ADSR_OUTConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ3
1ATT IN (+5V)Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ21
1ATT OUTConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ24
1B100k APotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV7
1B100k ATTPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV15
1B100k DPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV8
1B100k FREQPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV12
1B100k LEVEL1Potentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV1
1B100k LEVEL2Potentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV2
1B100k LFO WAVEPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV5
1B100k MIX IN1 LEVELPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV16
1B100k PANNINGPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV6
1B100k PWMPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV13
1B100k RPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV10
1B100k RESPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV11
1B100k SPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV9
1B100k TUNEPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV14
1B1M LFO RATEPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical_CircularHolesRV4
1BC857Package_TO_SOT_SMD:SOT-23Q2
1Conn_01x36Connector_PinSocket_2.54mm:PinSocket_1x36_P2.54mm_VerticalJ6
1Dual LEDLED_THT:LED_D5.0mmD5
1EXT INConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ14
1EXT_ONPolykit:switch-spdtSW1
1FILTER_APolykit:switch-spdtSW2
1FILTER_BPolykit:switch-spdtSW3
1FILTER_CPolykit:switch-spdtSW4
1FMConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ18
1FREQ CVConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ12
1FREQ_MODEPolykit:switch-spdtSW6
1GATEConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ4
1HARD SYNCConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ16
1L78L05_SO8Package_SO:SOIC-8_3.9x4.9mm_P1.27mmU3
1L79L05_SO8Package_SO:SOIC-8_3.9x4.9mm_P1.27mmU4
1LEDLED_THT:LED_D5.0mmD1
1LFOConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ8
1LOGOPolykit:bärG***
1LOGOPolykit:logo-silk-2.5cmG***
1MC78M12_TO252Package_TO_SOT_SMD:TO-252-2U1
1MC79M12_TO252Package_TO_SOT_SMD:TO-252-2U2
1MIX IN1 (-5V)Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ26
1MIX IN2Connector_Pin:Pin_D1.0mm_L10.0mmJ25
1MIX IN2Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ27
1MIX OUTConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ29
1MULTConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ19
1MULT1Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ22
1MULT2Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ23
1OUT LEFTConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ1
1OUT RIGHTConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ2
1PAN_CVConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ9
1PITCH CV 1V/OCTConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ13
1PWM CVConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ10
1RES CVConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ11
1RES_MODEPolykit:switch-spdtSW5
1SAW_TRIANGLEPolykit:switch-spdtSW7
1SOFT SYNCConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ17
1TL072Package_SO:SO-8_3.9x4.9mm_P1.27mmU9
1TRIGGERConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesJ5

The 164 most common of 167 parts.

Questions

How big is the Polykit x monosynth PCB?

It measures 200 × 100 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Polykit x monosynth use?

167 parts, built around the TL072, BAS85, BC847 and US1G. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Polykit x monosynth KiCad files?

From the polykit/polykit-x-monosynth repository on GitHub, at the commit this page was made from: the board is polykit-x-monosynth.kicad_pcb and its schematic LFO.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Polykit x monosynth design in my own project?

Its repository states no licence, so its author keeps all rights: ask polykit before reusing the design.

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