{"id":16991908,"url":"https://github.com/polykit/vco-1","last_synced_at":"2026-01-04T08:10:35.248Z","repository":{"id":96852639,"uuid":"331951419","full_name":"polykit/vco-1","owner":"polykit","description":"PCB and schematics for a voltage controlled oscillator (VCO) based on the Jupiter 8.","archived":false,"fork":false,"pushed_at":"2021-01-22T13:23:22.000Z","size":1153,"stargazers_count":15,"open_issues_count":0,"forks_count":2,"subscribers_count":3,"default_branch":"master","last_synced_at":"2025-03-16T17:18:44.787Z","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":null,"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":null,"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}},"created_at":"2021-01-22T13:17:15.000Z","updated_at":"2023-09-12T14:58:41.000Z","dependencies_parsed_at":"2023-04-16T06:18:43.175Z","dependency_job_id":null,"html_url":"https://github.com/polykit/vco-1","commit_stats":null,"previous_names":[],"tags_count":1,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/polykit%2Fvco-1","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/polykit%2Fvco-1/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/polykit%2Fvco-1/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/polykit%2Fvco-1/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/polykit","download_url":"https://codeload.github.com/polykit/vco-1/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":244902926,"owners_count":20529115,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","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":"2024-10-14T03:27:44.485Z","updated_at":"2026-01-04T08:10:35.211Z","avatar_url":"https://github.com/polykit.png","language":null,"funding_links":[],"categories":[],"sub_categories":[],"readme":"# Polykit VCO-1\n\nThis repository contains schematics and PCB layout for a voltage controlled oscillator (VCO). The goal was to keep price and component count low while having a good 1V/oct tracking. The oscillator core is roughly bases on the Jupiter 8 with a simpler approach for the current sink. It either needs a pair of matched 2N3904 transistors or one BC847BS dual transistor. I have very good results with the BC847BS and an accurate tracking over several octaves. On the output it generates a ramp and a pulse signal with 10Vpp amplitude. There is also a CV input for pulse width modulation.\n\nNote: PCB also contains a simple sub-oscillator with output for one and two octaves down\n\nThere is also a PCB version with [eight oscillators on it](https://github.com/polykit/vco-8).\n\n![VCO-1 schematics](polykit-vco-1.png)\n\n# References\n\nhttps://www.muffwiggler.com/forum/viewtopic.php?t=92595\n\nhttps://kassu2000.blogspot.com/2015/12/vco-part-1-core.html\n\nhttps://kassu2000.blogspot.com/2015/10/transistor-matching.html\n\nhttp://www.synthdiy.com/files/2008/RolandJupiter8-ServiceNotes.pdf\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpolykit%2Fvco-1","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fpolykit%2Fvco-1","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpolykit%2Fvco-1/lists"}