{"product_id":"am-fm-thin-film-variable-capacitor-cbm-443bf-radio-tuning","title":"AM\/FM Thin Film Variable Capacitor CBM-443BF | Radio Tuning","description":"\u003cp\u003eThe \u003cstrong\u003eCBM-443BF-1AB4 AM+FM Thin Film Variable Capacitor\u003c\/strong\u003e is a precision electronic component designed for radio tuning circuits. Whether you're building, repairing, or experimenting with AM\/FM radio projects, this compact dual-gang variable capacitor delivers reliable performance in a durable plastic housing.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e CBM-443BF-1AB4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShell Size:\u003c\/strong\u003e 21 × 21 × 17 mm (plastic housing)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAM Section:\u003c\/strong\u003e 4 × 270 pF (quad gang)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFM Section:\u003c\/strong\u003e 2 × 20 pF (dual gang)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMounting Nut:\u003c\/strong\u003e M2.5\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic \/ PVC thin film construction\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 piece\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor Options:\u003c\/strong\u003e Available in 2 colors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Choose This Variable Capacitor?\u003c\/h3\u003e\n\u003cp\u003eThis thin film variable capacitor is engineered for smooth, precise tuning across both AM and FM bands. Its compact 21 × 21 × 17 mm form factor makes it ideal for DIY radio builds, electronics repair, hobbyist projects, and educational circuits. The standard M2.5 mounting nut ensures easy, secure installation in a wide range of enclosures and PCB configurations.\u003c\/p\u003e\n\n\u003ch3\u003eIdeal Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAM\/FM radio receiver tuning circuits\u003c\/li\u003e\n  \u003cli\u003eDIY radio construction and repair\u003c\/li\u003e\n  \u003cli\u003eElectronics hobbyist and maker projects\u003c\/li\u003e\n  \u003cli\u003eEducational electronics experiments\u003c\/li\u003e\n  \u003cli\u003eReplacement for worn or damaged variable capacitors in vintage radios\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Item color displayed in photos may appear slightly different on your monitor, as monitor calibration varies.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cp\u003eFor more information on electronic components and radio frequency circuits, visit the \u003ca href=\"https:\/\/www.nist.gov\/topics\/electronics\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eNational Institute of Standards and Technology (NIST) Electronics Resources\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the CBM-443BF-1AB4 AM+FM thin film variable capacitor used for?\u003c\/h4\u003e\n\u003cp\u003eA: The CBM-443BF-1AB4 is a dual-band variable capacitor primarily used in AM and FM radio tuning circuits. It allows you to adjust capacitance to tune into different radio frequencies. It's a popular choice for DIY radio builders, electronics hobbyists, and repair technicians working on AM\/FM receivers.\u003c\/p\u003e\n\u003ch4\u003eQ: What are the capacitance values for the AM and FM sections?\u003c\/h4\u003e\n\u003cp\u003eA: The AM section provides approximately 4 × 270 pF of capacitance, while the FM section offers approximately 2 × 20 pF. This dual-gang configuration makes it suitable for covering both AM and FM frequency bands within a single compact component.\u003c\/p\u003e\n\u003ch4\u003eQ: What mounting hardware does this variable capacitor use?\u003c\/h4\u003e\n\u003cp\u003eA: This capacitor uses a standard M2.5 mounting nut, making it easy to securely install in most DIY radio enclosures, breadboards, or PCB layouts. Its compact 21 × 21 × 17 mm plastic housing keeps your build neat and space-efficient.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this variable capacitor compatible with vintage radio repairs?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — the CBM-443BF-1AB4 is well-suited as a replacement component in vintage AM\/FM radio restorations, provided the circuit design accommodates its capacitance range and physical dimensions. Always verify specifications match your existing circuit before installation.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the CBM-443BF-1AB4 AM+FM thin film variable capacitor used for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The CBM-443BF-1AB4 is a dual-band variable capacitor primarily used in AM and FM radio tuning circuits. It allows you to adjust capacitance to tune into different radio frequencies. It's a popular choice for DIY radio builders, electronics hobbyists, and repair technicians working on AM\/FM receivers.\"}}, {\"@type\": \"Question\", \"name\": \"What are the capacitance values for the AM and FM sections?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The AM section provides approximately 4 × 270 pF of capacitance, while the FM section offers approximately 2 × 20 pF. This dual-gang configuration makes it suitable for covering both AM and FM frequency bands within a single compact component.\"}}, {\"@type\": \"Question\", \"name\": \"What mounting hardware does this variable capacitor use?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This capacitor uses a standard M2.5 mounting nut, making it easy to securely install in most DIY radio enclosures, breadboards, or PCB layouts. 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Always verify specifications match your existing circuit before installation.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/vpggdm-rp.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Tech, Tools \u0026 Auto\", \"item\": \"https:\/\/vpggdm-rp.myshopify.com\/collections\/tech-tools-auto\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"AM\/FM Thin Film Variable Capacitor CBM-443BF | Radio Tuning\", \"item\": \"https:\/\/vpggdm-rp.myshopify.com\/products\/am-fm-thin-film-variable-capacitor-cbm-443bf-radio-tuning\"}]}\u003c\/script\u003e","brand":"Qme","offers":[{"title":"01  1PC","offer_id":49622858858710,"sku":"14:771#01  1PC","price":12.15,"currency_code":"USD","in_stock":true},{"title":"02   1PC","offer_id":49622858891478,"sku":"14:193#02   1PC","price":13.51,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0827\/5243\/8486\/files\/Scabf1e6756db49149daa0dfe8b509262O.webp?v=1785077228","url":"https:\/\/qmeboost.com\/products\/am-fm-thin-film-variable-capacitor-cbm-443bf-radio-tuning","provider":"Qme","version":"1.0","type":"link"}