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

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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

Ref Qnty Value Name Description
C1, C2 2 1000uF C_Polarized Electrolytic capacitor
C3, C4 2 100uF C_Polarized Electrolytic capacitor
C5, C6 2 10uF C_Polarized Electrolytic capacitor
C7, C8 2 1uF C_Polarized Electrolytic capacitor
C9 1 2u2 non-polarized C Film or ceramic capacitor
C10, C11, C12, C13, C14 5 100n C Ceramic capacitor
D1 1 LED LED Light emitting diode
D2, D3 2 US1G US1G 400V, 1A, General Purpose Rectifier Diode, SMA(DO-214AC)
D4, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15 11 BAS85 D_Schottky Schottky diode
D5 1 Dual LED LED_Dual_Bidirectional Dual LED, bidirectional
J1 1 OUT LEFT AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J2 1 OUT RIGHT AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J3 1 ADSR_OUT AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J4 1 GATE AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J5 1 TRIGGER AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J6 1 Conn_01x36 Conn_01x36 Pinheader, 01x36
J7 1 12V AC Jack-DC Barrel Jack Socket, 12V AC/AC 1A wall wart power supply is needed
J8 1 LFO AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J9 1 PAN_CV AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J10 1 PWM CV AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J11 1 RES CV AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J12 1 FREQ CV AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J13 1 PITCH CV 1V/OCT AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J14 1 EXT IN AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J15 1 VCA CV AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J16 1 HARD SYNC AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J17 1 SOFT SYNC AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J18 1 FM AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J19 1 MULT AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J20 1 WAVE IN AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J21 1 ATT IN (+5V) AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J22 1 MULT1 AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J23 1 MULT2 AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J24 1 ATT OUT AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J25 1 MIX IN2 Can be used as default input for MIX2 when not patched
J26 1 MIX IN1 (-5V) AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J27 1 MIX IN2 AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J28 1 WAVE OUT AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
J29 1 MIX OUT AudioJack2_SwitchT Audio Jack, 2 Poles (Mono / TS), https://www.thonk.co.uk/shop/thonkiconn
Q1, Q3 2 BC847 BC847 0.1A Ic, 45V Vce, NPN Transistor, SOT-23
Q2 1 BC857 BC857 0.1A Ic, 45V Vce, PNP Transistor, SOT-23
R1, R18, R19, R47, R50 5 10k R Resistor
R2, R3, R4, R5, R20, R21, R45, R46, R54, R58 10 1k R Resistor
R10 1 100 R Resistor
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, R57 31 100k R Resistor
R14 1 220k R Resistor
R16 1 15k R Resistor
R17, R48, R49 3 12k R Resistor
R26 1 47k R Resistor
R42 1 470k R Resistor
RV1 1 B100k LEVEL1 R_POT-Device Potentiometer RK097 Vertical
RV2 1 B100k LEVEL2 R_POT-Device Potentiometer RK097 Vertical
RV3 1 10k LFO TRIM R_Potentiometer_Trim Trim-potentiometer
RV4 1 B1M LFO RATE R_POT-Device Potentiometer RK097 Vertical
RV5 1 B100k LFO WAVE R_POT-Device Potentiometer RK097 Vertical
RV6 1 B100k PANNING R_POT-Device Potentiometer RK097 Vertical
RV7 1 B100k A R_POT-Device Potentiometer RK097 Vertical
RV8 1 B100k D R_POT-Device Potentiometer RK097 Vertical
RV9 1 B100k S R_POT-Device Potentiometer RK097 Vertical
RV10 1 B100k R R_POT-Device Potentiometer RK097 Vertical
RV11 1 B100k RES R_POT-Device Potentiometer RK097 Vertical
RV12 1 B100k FREQ R_POT-Device Potentiometer RK097 Vertical
RV13 1 B100k PWM R_POT-Device Potentiometer RK097 Vertical
RV14 1 B100k TUNE R_POT-Device Potentiometer RK097 Vertical
RV15 1 B100k ATT R_POT-Device Potentiometer RK097 Vertical
RV16 1 B100k MIX IN1 LEVEL R_POT-Device Potentiometer RK097 Vertical
SW1 1 EXT_ON SW_SPDT Switch, single pole double throw
SW2 1 FILTER_A SW_SPDT Switch, single pole double throw
SW3 1 FILTER_B SW_SPDT Switch, single pole double throw
SW4 1 FILTER_C SW_SPDT Switch, single pole double throw
SW5 1 RES_MODE SW_SPDT_MSM Switch, single pole double throw, center OFF position
SW6 1 FREQ_MODE SW_SPDT_MSM Switch, single pole double throw, center OFF position
SW7 1 SAW_TRIANGLE SW_SPDT Switch, single pole double throw
U1 1 MC78M12_TO252 78M12 TO-252 Positive 500mA 35V Linear Regulator, Fixed Output 5V, TO-252 (D-PAK)
U2 1 MC79M12_TO252 79M12 TO-252 Negative 500mA 35V Linear Regulator, Fixed Output -12V, TO-252 (D-PAK)
U3 1 L78L05_SO8 78L05 SO-8 Positive 100mA 30V Linear Regulator, Fixed Output 5V, SO-8
U4 1 L79L05_SO8 79L05 SO-8 Negative 100mA -30V Linear Regulator, Fixed Output -5V, SO-8
U5, U6, U7, U8 4 TL074 TL074 Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14
U9 1 TL072 TL072 Dual 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