4 layers161 × 100 mm
AD DA module
KLFAMO/relock_Artiq
This project is an electronic device based on the STM32 microcontroller, equipped with an Ethernet port for remote control and data communication.
416 parts
2 layers285 × 222.5 mm
Polykit x mainboard
polykit/polykit-x-mainboard22Schematics and PCB layout for a mainboard for an 8 voice polyphonic synthesizer
- Size
- 285 × 222.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 220
- Nets
- 226
- Pads
- 931
- Tracks, vias
- 1,790, 367
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 21 Jan 2023
- Updated
- 9 May 2025
Overview
Polykit x mainboard is an open-source printed circuit board by polykit, from the polykit/polykit-x-mainboard repository on GitHub. It is a 2-layer board of 285 × 222.5 mm with 220 parts on 226 nets, routed with 1,790 tracks and 367 vias.
It is built around the AD5676ARUZ, TL072 and CD4051BE, with the L7905, LM4040AIM3-5.0 and 1N4148WS among its other parts. Its parts include 65 capacitors, 47 resistors, 20 ICs, 10 connectors and 1 diode. It belongs with the computers and single-board computers and audio and music boards of this library.
Main components
6
AD5676ARUZ
TSSOP-20-40℃~+125℃ 1.1mA 16 2.7V~5.5V 5us 8 8LSB SPI Voltage Buffer TSSOP-20 Digital to Analog Converters (DAC) ROHSAnalog DevicesDigital To Analog Converters (DAC)
TL072
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 10V/us 10mV 2 2.5nA 3MHz 85dB SOP-8 Operational Amplifier ROHSGcoreOperational Amplifier
CD4051BE
PDIP-16-55℃~+125℃ 125Ω 20MHz 3V~20V 450ns 8 8:1 PDIP-16 Analog Switches, Multiplexers ROHSTexas InstrumentsAnalog Switches, MultiplexersL7905
TO-220TO-220 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSKTPUncategorised
LM4040AIM3-5.0
SOT-23-3-40℃~+85℃@(Ta) 100ppm/℃ 15mA 5V 80uVrms Fixed Parallel ±0.1% SOT-23-3 Voltage ReferenceMaxim Integrated (Analog Devices)Voltage Reference
1N4148WS
SOD-3231.25V@150mA 100V 150mA 1uA@75V 200mW 2A 4ns Independent SOD-323 Switching Diodes ROHSJiangsu Changjing Electronics Technology (CJ)Switching Diodes
README
README.mdPolykit 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
Related repositories:
- Voice Card: https://github.com/polykit/polykit-x-voice-card
- Control Board: https://github.com/polykit/polykit-x-controlboard
- Input Board: soon
- Software: soon
- Power Supply: https://github.com/polykit/eurorack-psu
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
Parts
220| Qty | Value | Footprint | References |
|---|---|---|---|
| 40 | LOGO | Polykit:blitz-silk-tiny | G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G*** +24 |
| 36 | 100k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, R25, R26 +20 |
| 32 | 10n | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C3, C4, C10, C19, C20, C21, C22, C26, C27, C28, C29, C35, C36, C37, C38, C39 +16 |
| 28 | 100n | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1, C2, C11, C12, C13, C14, C15, C16, C17, C18, C23, C24, C25, C31, C32, C33 +12 |
| 27 | LOGO | Polykit:star-silk | G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G*** +11 |
| 10 | TL074 | Package_SO:SO-14_3.9x8.65mm_P1.27mm | U3, U4, U6, U7, U8, U13, U14, U16, U17, U19 |
| 8 | VOICE | Connector_PinSocket_2.54mm:PinSocket_1x36_P2.54mm_Vertical | VOICE1, VOICE2, VOICE3, VOICE4, VOICE5, VOICE6, VOICE7, VOICE8 |
| 5 | 10k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R9, R10, R11, R12, R47 |
| 4 | 100u | Capacitor_SMD:CP_Elec_6.3x7.7 | C60, C61, C62, C63 |
| 4 | CD4051B | Package_SO:SO-16_5.3x10.2mm_P1.27mm | U2, U5, U12, U15 |
| 3 | 1k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R8, R42, R43 |
| 3 | 220R | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R44, R45, R46 |
| 1 | 10u | Capacitor_SMD:CP_Elec_5x5.9 | C30 |
| 1 | 1N4148WS | Diode_SMD:D_SOD-323_HandSoldering | D1 |
| 1 | 6N137 | Package_DIP:DIP-8_W7.62mm_SMDSocket_SmallPads | U20 |
| 1 | AD5676ARUZ | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U10 |
| 1 | EXTERNAL_IN | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J5 |
| 1 | EXT_ANALOG | Connector_IDC:IDC-Header_2x08_P2.54mm_Vertical | J9 |
| 1 | EXT_DIGITAL | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | J10 |
| 1 | I2C_1 | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | J6 |
| 1 | I2C_2 | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | J7 |
| 1 | L7905 | Package_TO_SOT_SMD:TO-263-2 | U18 |
| 1 | LM4040AIM3-5.0 | Package_TO_SOT_SMD:SOT-23 | U9 |
| 1 | LOGO | Polykit:logo-5cm | G*** |
| 1 | LOGO | Polykit:bär | G*** |
| 1 | MIDI IN | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J3 |
| 1 | MIDI_OUT | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J4 |
| 1 | Mega2560Pro_Mini | aga:Mega2560Pro_Embed_RobotDyn | U1 |
| 1 | OUTPUT | Connector_Molex:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J2 |
| 1 | POWER | Connector_IDC:IDC-Header_2x08_P2.54mm_Vertical | J1 |
| 1 | SPI | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | J8 |
| 1 | TL072 | Package_SO:SO-8_3.9x4.9mm_P1.27mm | U11 |
Questions
How big is the Polykit x mainboard PCB?
It measures 285 × 222.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Polykit x mainboard use?
220 parts, built around the AD5676ARUZ, TL072, CD4051BE and L7905. 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 mainboard KiCad files?
From the polykit/polykit-x-mainboard repository on GitHub, at the commit this page was made from: the board is polykit-x-mainboard.kicad_pcb and its schematic dac.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Polykit x mainboard design in my own project?
Its repository states no licence, so its author keeps all rights: ask polykit before reusing the design.
Similar boards
- 2 layers151.4 × 128.5 mm
- 2 layers98 × 98 mm
VCDO
Sonosus/VCDO
A Kosmo oscillator module that uses the Electric Druid VCDO chip.
93 parts4CC-BY-SA-4.0 - 2 layers30 × 100.8 mm
- 2 layers346.7 × 116.8 mm
- 2 layers200 × 100 mm
Polykit x voice card
polykit/polykit-x-voice-card
Schematics and PCB layout for a voice card with multimode filter for a polyphonic synthesizer
207 parts58 - 2 layers242.5 × 102.5 mm
- 2 layers150 × 100 mm
