{"product_id":"cbm-443bf-am-fm-dual-variable-capacitor-270pf-20pf-radio-tuning","title":"CBM-443BF AM\/FM Dual Variable Capacitor 270PF + 20PF Radio","description":"\n\u003ch2\u003eCBM-443BF Thin Film Dual Variable Capacitor for AM\/FM Radio Tuning Circuits\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eCBM-443BF Dual Variable Capacitor\u003c\/strong\u003e is a compact, high-quality thin film (PVC) variable capacitor designed for AM\/FM radio tuning circuits, medium and short wave radios, and crystal\/ore radio projects. Whether you're a hobbyist building a radio from scratch or an electronics enthusiast repairing a vintage set, this dual-gang variable capacitor delivers reliable, precise frequency tuning in a small, durable plastic housing.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e CBM-443BF\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAM Section:\u003c\/strong\u003e 2 × 270PF dual variable capacitance with 4 fine-tuning capacitors (gang: ~4 × 270PF total)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFM Section:\u003c\/strong\u003e 2 × 20PF dual variable capacitors (usable in conjunction with the 270PF group)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Thin film (PVC) dielectric — smooth, stable tuning action\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e M2.5 mounting nut for secure, standard panel installation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHousing Material:\u003c\/strong\u003e Durable plastic shell\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Size:\u003c\/strong\u003e 21 mm × 21 mm × 17 mm — fits easily into tight enclosures\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 piece per order\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIdeal Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAM\/FM radio tuning circuits\u003c\/li\u003e\n  \u003cli\u003eMedium and short wave radio receivers\u003c\/li\u003e\n  \u003cli\u003eCrystal (ore) radio construction\u003c\/li\u003e\n  \u003cli\u003eDIY and maker radio projects\u003c\/li\u003e\n  \u003cli\u003eElectronics repair and prototyping\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications at a Glance\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003cth style=\"padding:8px; border:1px solid #ddd; text-align:left;\"\u003eParameter\u003c\/th\u003e\n\u003cth style=\"padding:8px; border:1px solid #ddd; text-align:left;\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eCBM-443BF\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eAM Capacitance\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e~4 × 270PF (dual gang)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eFM Capacitance\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e~2 × 20PF (dual gang)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eDielectric Type\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eThin Film (PVC)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eMounting Nut\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eM2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eHousing Size\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e21 × 21 × 17 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eMaterial\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003ePlastic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eMade in China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003ePlease allow ±1–2 mm tolerance due to manual measurement.\u003c\/li\u003e\n  \u003cli\u003eActual color may vary slightly from photos due to monitor calibration differences.\u003c\/li\u003e\n  \u003cli\u003eThe 2 × 20PF FM group is usable only in conjunction with the 2 × 270PF AM group.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-percent-better-every-day-motivational-canvas-wall-poster-inspirational-quote\"\u003e\"1% Better Every Day\" Motivational Canvas Poster | Wall Art\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/best-seat-in-the-house-retro-quote-canvas-wall-art-print\"\u003e\"Best Seat In The House\" Retro Quote Canvas Wall Art Print\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFurther Reading\u003c\/h3\u003e\n\u003cp\u003eFor guidance on electrical component safety and best practices for DIY electronics projects, visit the U.S. Consumer Product Safety Commission (CPSC). For electronics and RF standards, explore resources at \u003ca href=\"https:\/\/www.nist.gov\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eNIST.gov\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the CBM-443BF dual variable capacitor used for?\u003c\/h4\u003e\n\u003cp\u003eA: The CBM-443BF is a thin film dual variable capacitor primarily used in AM\/FM radio tuning circuits, medium and short wave radio receivers, and crystal (ore) radio builds. It provides smooth, precise capacitance adjustment for frequency selection in DIY and repair radio projects.\u003c\/p\u003e\n\u003ch4\u003eQ: Can the FM (20PF) section be used independently?\u003c\/h4\u003e\n\u003cp\u003eA: No — the 2 × 20PF FM dual variable capacitor group is designed to work in conjunction with the 2 × 270PF AM group. Both sections share the same mechanical assembly and must be used together within the same circuit.\u003c\/p\u003e\n\u003ch4\u003eQ: What mounting hardware does the CBM-443BF use?\u003c\/h4\u003e\n\u003cp\u003eA: This variable capacitor uses an M2.5 mounting nut, which is a standard size easily found at most electronics and hardware suppliers. The compact 21 × 21 × 17 mm plastic housing makes it suitable for both panel-mount and breadboard enclosure installations.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this capacitor suitable for a beginner radio-building project?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The CBM-443BF is a popular choice for hobbyists and students building their first AM\/FM or shortwave radio kit. Its dual-gang design simplifies the tuning circuit, and its compact plastic body makes it easy to handle and install in a wide variety of radio enclosure designs.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the CBM-443BF dual variable capacitor used for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The CBM-443BF is a thin film dual variable capacitor primarily used in AM\/FM radio tuning circuits, medium and short wave radio receivers, and crystal (ore) radio builds. 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