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Schematics and PCB layout for a mainboard for an 8 voice polyphonic synthesizer

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Polykit X8 Mainboard

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 for a main board for a polyphonic synthesizer that is controlled by a micro controller.

Key features:

  • 8 voice cards
  • 16-bit DAC
  • Atmel2560 micro controller
  • Eurorack powered
  • MIDI input/output

All parameters of the voice cards are controlled by the DAC. That means patches can be stored and recalled.

There is a video playlist on the design process https://makertube.net/w/p/3N2fRjXwT2SfAUv2VkMy3e

Polykit X8 Main Board Rendering

Related repositories:

BOM

Reference Value Footprint Qty
C1, C2, C11-C18, C23-C25, C31-C34, C43-C47, C56-C59, C64, C65 100n ceramic Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder 28
C3-C10, C19-C22, C26-C29, C35-C42, C48-C55 10n film, PPS Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder 32
C30 10u Capacitor_SMD:CP_Elec_5x5.9 1
C60-C63 100u Capacitor_SMD:CP_Elec_6.3x7.7 4
D1 1N4148WS Diode_SMD:D_SOD-323_HandSoldering 1
J1 POWER Connector_IDC:IDC-Header_2x08_P2.54mm_Vertical 1
J2 OUTPUT Connector_Molex:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical 1
J3 MIDI IN Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical 1
J4 MIDI_OUT Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical 1
J5 EXTERNAL_IN Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical 1
J6 I2C_1 Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical 1
J7 I2C_2 Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical 1
J8 SPI Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical 1
J9 EXT_ANALOG Connector_IDC:IDC-Header_2x08_P2.54mm_Vertical 1
J10 EXT_DIGITAL Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical 1
R1-R7, R13-R41 100k Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder 36
R8, R42, R43 1k Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder 3
R9-R12, R47 10k Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder 5
R44-R46 220R Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder 3
U1 Mega2560Pro_Mini aga:Mega2560Pro_Embed_RobotDyn 1
U2, U5, U12, U15 CD4051B Package_SO:SO-16_5.3x10.2mm_P1.27mm 4
U3, U4, U6-U8, U13, U14, U16, U17, U19 TL074 Package_SO:SO-14_3.9x8.65mm_P1.27mm 10
U9 LM4040AIM3-5.0 Package_TO_SOT_SMD:SOT-23 1
U10 AD5676ARUZ Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm 1
U11 TL072 Package_SO:SO-8_3.9x4.9mm_P1.27mm 1
U18 L7905 Package_TO_SOT_SMD:TO-263-2 1
U20 6N137 Package_DIP:DIP-8_W7.62mm_SMDSocket_SmallPads 1
VOICE1-VOICE8 VOICE Connector_PinSocket_2.54mm:PinSocket_1x36_P2.54mm_Vertical 8

Tweaks

  • If saw/triangle signal is not audible replace R38 with a 220k resistor on the voice cards

References

https://www.analog.com/media/en/technical-documentation/data-sheets/ad5676.pdf

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Schematics and PCB layout for a mainboard for an 8 voice polyphonic synthesizer

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