{"id":16991897,"url":"https://github.com/polykit/polykit-x-mainboard","last_synced_at":"2026-02-10T20:31:49.648Z","repository":{"id":217114227,"uuid":"591796086","full_name":"polykit/polykit-x-mainboard","owner":"polykit","description":"Schematics and PCB layout for a mainboard for an 8 voice polyphonic synthesizer","archived":false,"fork":false,"pushed_at":"2025-05-09T11:59:34.000Z","size":4013,"stargazers_count":22,"open_issues_count":0,"forks_count":3,"subscribers_count":2,"default_branch":"main","last_synced_at":"2026-02-06T13:33:02.096Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":"","language":null,"has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"other","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/polykit.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE.txt","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null,"zenodo":null}},"created_at":"2023-01-21T22:20:36.000Z","updated_at":"2025-11-23T07:30:43.000Z","dependencies_parsed_at":"2025-08-27T02:59:57.908Z","dependency_job_id":"fd16bfaf-90f2-40d3-86af-a1f1e1106a88","html_url":"https://github.com/polykit/polykit-x-mainboard","commit_stats":null,"previous_names":["polykit/polykit-x-mainboard"],"tags_count":1,"template":false,"template_full_name":null,"purl":"pkg:github/polykit/polykit-x-mainboard","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/polykit%2Fpolykit-x-mainboard","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/polykit%2Fpolykit-x-mainboard/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/polykit%2Fpolykit-x-mainboard/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/polykit%2Fpolykit-x-mainboard/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/polykit","download_url":"https://codeload.github.com/polykit/polykit-x-mainboard/tar.gz/refs/heads/main","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/polykit%2Fpolykit-x-mainboard/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":29314705,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-02-10T17:48:59.043Z","status":"ssl_error","status_checked_at":"2026-02-10T17:45:37.240Z","response_time":65,"last_error":"SSL_connect returned=1 errno=0 peeraddr=140.82.121.5:443 state=error: unexpected eof while reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2024-10-14T03:27:43.072Z","updated_at":"2026-02-10T20:31:49.627Z","avatar_url":"https://github.com/polykit.png","language":null,"funding_links":[],"categories":[],"sub_categories":[],"readme":"# Polykit X8 Mainboard\n\n_THIS IS NOT A FINISHED PRODUCT IN ANY WAY AND STILL UNDER HEAVY DEVELOPMENT - USE AT YOUR OWN RISK!_\n\nThis repository contains Kicad schematics and PCB layout for a main board for a polyphonic synthesizer that is controlled by a micro controller.\n\nKey features:\n\n* 8 voice cards\n* 16-bit DAC\n* Atmel2560 micro controller\n* Eurorack powered\n* MIDI input/output\n\nAll parameters of the voice cards are controlled by the DAC. That means patches can be stored and recalled.\n\nThere is a video playlist on the design process https://makertube.net/w/p/3N2fRjXwT2SfAUv2VkMy3e\n\n![Polykit X8 Main Board Rendering](polykit-x-mainboard-rendering.jpg)\n\nRelated repositories:\n\n* Voice Card: https://github.com/polykit/polykit-x-voice-card\n* Control Board: https://github.com/polykit/polykit-x-controlboard\n* Input Board: _soon_\n* Software: _soon_\n* Power Supply: https://github.com/polykit/eurorack-psu\n\n## BOM\n\n|Reference                                                    |Value           |Footprint                                                     |Qty|\n|-------------------------------------------------------------|----------------|--------------------------------------------------------------|---|\n|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 |\n|C3-C10, C19-C22, C26-C29, C35-C42, C48-C55                   |10n film, PPS   |Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder     |32 |\n|C30                                                          |10u             |Capacitor_SMD:CP_Elec_5x5.9                                   |1  |\n|C60-C63                                                      |100u            |Capacitor_SMD:CP_Elec_6.3x7.7                                 |4  |\n|D1                                                           |1N4148WS        |Diode_SMD:D_SOD-323_HandSoldering                             |1  |\n|J1                                                           |POWER           |Connector_IDC:IDC-Header_2x08_P2.54mm_Vertical                |1  |\n|J2                                                           |OUTPUT          |Connector_Molex:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical|1  |\n|J3                                                           |MIDI IN         |Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical|1  |\n|J4                                                           |MIDI_OUT        |Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical|1  |\n|J5                                                           |EXTERNAL_IN     |Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical|1  |\n|J6                                                           |I2C_1           |Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical                |1  |\n|J7                                                           |I2C_2           |Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical                |1  |\n|J8                                                           |SPI             |Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical                |1  |\n|J9                                                           |EXT_ANALOG      |Connector_IDC:IDC-Header_2x08_P2.54mm_Vertical                |1  |\n|J10                                                          |EXT_DIGITAL     |Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical                |1  |\n|R1-R7, R13-R41                                               |100k            |Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder      |36 |\n|R8, R42, R43                                                 |1k              |Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder      |3  |\n|R9-R12, R47                                                  |10k             |Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder      |5  |\n|R44-R46                                                      |220R            |Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder      |3  |\n|U1                                                           |Mega2560Pro_Mini|aga:Mega2560Pro_Embed_RobotDyn                                |1  |\n|U2, U5, U12, U15                                             |CD4051B         |Package_SO:SO-16_5.3x10.2mm_P1.27mm                           |4  |\n|U3, U4, U6-U8, U13, U14, U16, U17, U19                       |TL074           |Package_SO:SO-14_3.9x8.65mm_P1.27mm                           |10 |\n|U9                                                           |LM4040AIM3-5.0  |Package_TO_SOT_SMD:SOT-23                                     |1  |\n|U10                                                          |AD5676ARUZ      |Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm                         |1  |\n|U11                                                          |TL072           |Package_SO:SO-8_3.9x4.9mm_P1.27mm                             |1  |\n|U18                                                          |L7905           |Package_TO_SOT_SMD:TO-263-2                                   |1  |\n|U20                                                          |6N137           |Package_DIP:DIP-8_W7.62mm_SMDSocket_SmallPads                 |1  |\n|VOICE1-VOICE8                                                |VOICE           |Connector_PinSocket_2.54mm:PinSocket_1x36_P2.54mm_Vertical    |8  |\n\n\n## Tweaks\n\n* If saw/triangle signal is not audible replace R38 with a 220k resistor on the voice cards\n\n## References\n\nhttps://www.analog.com/media/en/technical-documentation/data-sheets/ad5676.pdf\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpolykit%2Fpolykit-x-mainboard","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fpolykit%2Fpolykit-x-mainboard","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpolykit%2Fpolykit-x-mainboard/lists"}