{"id":30330147,"url":"https://github.com/oonap0oo/ngspice_analog_circuit_simulation","last_synced_at":"2026-02-11T11:30:57.745Z","repository":{"id":309920213,"uuid":"1038031268","full_name":"oonap0oo/ngspice_analog_circuit_simulation","owner":"oonap0oo","description":"Files for use with the ngspice circuit simulation software","archived":false,"fork":false,"pushed_at":"2025-08-14T14:20:37.000Z","size":2720,"stargazers_count":0,"open_issues_count":0,"forks_count":0,"subscribers_count":0,"default_branch":"main","last_synced_at":"2025-08-14T16:07:33.402Z","etag":null,"topics":["circuit","ngspice","simulation","simulator","spice"],"latest_commit_sha":null,"homepage":"","language":null,"has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"gpl-3.0","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/oonap0oo.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","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":"2025-08-14T14:04:52.000Z","updated_at":"2025-08-14T14:21:33.000Z","dependencies_parsed_at":"2025-08-14T16:18:48.669Z","dependency_job_id":null,"html_url":"https://github.com/oonap0oo/ngspice_analog_circuit_simulation","commit_stats":null,"previous_names":["oonap0oo/ngspice_analog_circuit_simulation"],"tags_count":null,"template":false,"template_full_name":null,"purl":"pkg:github/oonap0oo/ngspice_analog_circuit_simulation","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/oonap0oo%2Fngspice_analog_circuit_simulation","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/oonap0oo%2Fngspice_analog_circuit_simulation/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/oonap0oo%2Fngspice_analog_circuit_simulation/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/oonap0oo%2Fngspice_analog_circuit_simulation/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/oonap0oo","download_url":"https://codeload.github.com/oonap0oo/ngspice_analog_circuit_simulation/tar.gz/refs/heads/main","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/oonap0oo%2Fngspice_analog_circuit_simulation/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":270936131,"owners_count":24670945,"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","status":"online","status_checked_at":"2025-08-18T02:00:08.743Z","response_time":89,"last_error":null,"robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":true,"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":["circuit","ngspice","simulation","simulator","spice"],"created_at":"2025-08-18T02:41:48.370Z","updated_at":"2026-02-11T11:30:57.725Z","avatar_url":"https://github.com/oonap0oo.png","language":null,"funding_links":[],"categories":[],"sub_categories":[],"readme":"# ngspice_analog_circuit_simulation\nFiles for use with the [ngspice](https://ngspice.sourceforge.io/) circuit simulation software\n\n## Chua's circuit\n\nThis circuit desciption runs a version of Chua' circuit which shows chaotic behavior.\n\nCircuit description file: [chua_circuit_6.sp](chua_circuit_6.sp)\n\nThis plot generated by ngspice shows two voltages in the circuit in a x-y plot.\n\n![ngspice_chua_circuit_screenshot.png](ngspice_chua_circuit_screenshot.png)\n\nThe circuit description file was made based on this hand drawn schematic:\n\n![chua_circuit_hand_dranw_schematic.png](chua_circuit_hand_dranw_schematic.png)\n\nThe amplifier in the circuit was modelled using a Voltage Dependent Voltage Source (E1), the output voltage is limited as in real world amplifiers using the table option.\n\nThe diodes and voltage sources introduce non-linearity which is a essential part of the circuit.\n\n## Ring Modulator\n\nThis is a classic ring modulator with 4 diodes. The circuit multiplies two signals creating new sum and difference frequency components at it's output.\n\n![Ring_Modulator.png](Ring_Modulator.png)\n\nSchematic found on wikimedia: [https://commons.wikimedia.org/wiki/File:Ring_Modulator.PNG](https://commons.wikimedia.org/wiki/File:Ring_Modulator.PNG)\nLicense: [https://creativecommons.org/licenses/by-sa/3.0/deed.en](https://creativecommons.org/licenses/by-sa/3.0/deed.en)\nModified by adding node numbers.\n\nCircuit desciption file: [ring_mod.sp](ring_mod.sp)\n\nIn this example inputs to the circuit are signals at 1kHz and 1.2kHz, the output includes components at 2.2kHz (sum) and 200Hz (difference).\n\nOutput signal:\n![ring_mod_screenshot3.png](ring_mod_screenshot3.png)\n\nFrequency spectrum of output signal:\n![ring_mod_screenshot1.png](ring_mod_screenshot1.png)\n\nInput signals:\n![ring_mod_screenshot2.png](ring_mod_screenshot2.png)\n\n\n\n\n\n\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Foonap0oo%2Fngspice_analog_circuit_simulation","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Foonap0oo%2Fngspice_analog_circuit_simulation","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Foonap0oo%2Fngspice_analog_circuit_simulation/lists"}