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# Polykit X8 Controlboard
_THIS IS NOT A FINISHED PRODUCT IN ANY WAY AND STILL UNDER HEAVY DEVELOPMENT - USE AT YOUR OWN RISK!_
This repository contains Kicad schematics and PCB layout of a control board for a polyphonic synthesizer.
There is a video playlist on the design process https://makertube.net/w/p/3N2fRjXwT2SfAUv2VkMy3e
Related repositories:
* Voice Card: https://github.com/polykit/polykit-x-voice-card
* Main Board: https://github.com/polykit/polykit-x-mainboard
* Input Board: _soon_
* Software: _soon_
* Power Supply: https://github.com/polykit/eurorack-psu
## BOM
|Reference|Value |Footprint |Comment |Qty|
|---------|--------------|---------------------------------------------------------------|--------------------------------------|---|
|C1, C2 |100n |Capacitor_SMD:C_1206_3216Metric | |2 |
|D1-D4 |1N4148WS |Diode_SMD:D_SOD-323 | |4 |
|J1 |MCU_BOARD |Connector_PinHeader_2.54mm:PinHeader_1x16_P2.54mm_Vertical |optional, when used as MIDI controller|1 |
|J2 |X8_I2C_POWER |Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | |1 |
|J3 |X8_EXT_DIGITAL|Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | |1 |
|J4 |DISPLAY |Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | |1 |
|R1-R34 |10k |Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | |34 |
|SW1-SW6 |SW_Push |Button_Switch_THT:SW_PUSH_6mm_H13mm | |6 |
|SW7-SW22 |RotaryEncoder |Rotary_Encoder:RotaryEncoder_Bourns_Vertical_PEC12R-3xxxF-Nxxxx|without switch |16 |
|U1, U2 |MCP23017_SO |Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm | |2 |
## References
https://www.ti.com/lit/an/slva704/slva704.pdf
https://github.com/horfee/kicad-packages3D/tree/master/Rotary_Encoder.3dshapes