{"id":27174036,"url":"https://github.com/bmoren/two-tone","last_synced_at":"2026-02-09T19:38:51.803Z","repository":{"id":71516054,"uuid":"136498341","full_name":"bmoren/two-tone","owner":"bmoren","description":"2X passive LPG\u0026LPF with DIY vactrols","archived":false,"fork":false,"pushed_at":"2021-02-24T00:23:51.000Z","size":2524,"stargazers_count":38,"open_issues_count":0,"forks_count":3,"subscribers_count":7,"default_branch":"master","last_synced_at":"2025-07-27T06:01:40.211Z","etag":null,"topics":["audio","eurorack","modular","module","synth","synthesizer"],"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/bmoren.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":"2018-06-07T15:39:37.000Z","updated_at":"2025-05-08T02:54:37.000Z","dependencies_parsed_at":"2023-07-31T01:46:27.259Z","dependency_job_id":null,"html_url":"https://github.com/bmoren/two-tone","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/bmoren/two-tone","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/bmoren%2Ftwo-tone","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/bmoren%2Ftwo-tone/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/bmoren%2Ftwo-tone/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/bmoren%2Ftwo-tone/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/bmoren","download_url":"https://codeload.github.com/bmoren/two-tone/tar.gz/refs/heads/master","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/bmoren%2Ftwo-tone/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":29278492,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-02-09T19:05:41.198Z","status":"ssl_error","status_checked_at":"2026-02-09T19:05:37.449Z","response_time":56,"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":["audio","eurorack","modular","module","synth","synthesizer"],"created_at":"2025-04-09T11:38:36.703Z","updated_at":"2026-02-09T19:38:51.787Z","avatar_url":"https://github.com/bmoren.png","language":null,"funding_links":[],"categories":[],"sub_categories":[],"readme":"# two tone\n\u003cimg src=\"twotone.jpg\" height=\"300px\"\u003e\n\nI wanted to work on building a simple module from start to finish to test out some panel fab ideas and I thought a LPG/LPF would be a good candidate. After listening to Why We Bleep Ep.2 with Abstract Data and talking about the character of imperfection in analog circuits, I thought making a DIY vactrol based board would be interesting! I also thought if there were 2 halves, you could use slightly different components and vary each to make them truly distinct from one another. You can get different characteristics in the filter depending on the size and material of the LPF capacitor and the LDR/LED combo or vactrol used.\n\nShout out to [Look Mum No Computer](https://www.youtube.com/watch?v=Ch9w5JtbZSc) and [Meng Qi](https://www.mengqimusic.com/) for the initial inspiration for this module!\nThanks to [Josh Mason](http://www.joshmason.info/) for the Front Panel Express panel versions.\n\n[Panel font by Alice Savoie / CNAP 19 CC BY-ND 4.0](http://cnap.graphismeenfrance.fr/faune/en.html)\n\nmore discussion of this project [on llllllll.co](https://llllllll.co/t/prototyping-two-tone-a-2x-passive-lowpass-gate-and-filter-with-diy-vactrols/12663)\n\n### BOM:\n\n| Quantity    | Component     |\n| :------------- | :------------- |\n| 2| Song Huei tall trimmer pots, A10k is prefered (B10k works, but the taper is compressed) |\n| 6 | thonkikonn mono jacks |\n| 2 | 3mm LED's (White or Blue are best) |\n| 2 | Capacitors, 0.1uf - 4.7uf works best. |\n| 4 | 6.8k ohm resistors |\n| 2 | DIY or NLS-32 vactrol |\n\n### How to build a DIY vactrol:\n\nhttp://guitarpcb.com/PDF%20Files/DIY%20Vactrol.pdf\n\u003cbr\u003e\nhttps://www.youtube.com/watch?v=Je5FS1A7Ys0\n\u003cbr\u003e\nhttps://www.youtube.com/watch?v=Ch9w5JtbZSc\n\u003cbr\u003e\nhttps://www.youtube.com/watch?v=VZ1B0Epr770\n\nThe way I usually do it is to take some small heat shrink and heat shrink each leg of the LDR and LED and then hold the LDR and LED together with the light emitting and light sensing parts touching. Cover them in more heat shrink and heat! This way the large heat shrink holds them together while the small heat shrink on each leg prevents shorts.\n\nfor each DIY vactrol, I use:\n\n| Quantity      |Component     |\n| :------------- | :------------- |\n|1|LDR – GL5549 – 45~140(kOhm) |\n|1 | 5mm White LED|\n\n![vactrol](vactrol.jpg)\n\n---\n\n[CC-BY-SA-4.0](https://creativecommons.org/licenses/by-sa/4.0/).    \nBuild and use at your own risk! I am not responsible for any damage to self or otherwise that arises from using this project!\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fbmoren%2Ftwo-tone","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fbmoren%2Ftwo-tone","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fbmoren%2Ftwo-tone/lists"}