{"product_id":"sfm380-active-piezoelectric-buzzer-12v-24v-dc-car-speaker","title":"SFM380 Active Piezoelectric Buzzer 12V\/24V DC Car Speaker","description":"\n\u003ch2\u003eSFM380 Active Piezoelectric Buzzer – 12V \u0026amp; 24V DC Continuous Tone Speaker\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eSFM380 Active Buzzer\u003c\/strong\u003e (Model AT3040) is a rugged, reliable piezoelectric DC speaker designed for automotive and electronics applications. Whether you need a steady alarm tone for a vehicle reversing system, an industrial alert, or a DIY electronics project, this compact buzzer delivers a clear, continuous sound signal at both \u003cstrong\u003e12V and 24V DC\u003c\/strong\u003e operating voltages.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Voltage Compatibility:\u003c\/strong\u003e Operates at 12V and 24V DC – suitable for cars, trucks, and a wide range of electronic circuits.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eActive Piezoelectric Design:\u003c\/strong\u003e Built-in oscillator circuit means it produces continuous sound as soon as power is applied – no external signal generator needed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCar-Dedicated Construction:\u003c\/strong\u003e Engineered to meet automotive-grade durability demands, making it ideal for vehicle alarm systems, reverse warning tones, and dashboard alert circuits.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Lightweight:\u003c\/strong\u003e Easy to mount in tight spaces without adding bulk to your build.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Application Range:\u003c\/strong\u003e Suitable for automotive projects, industrial machinery alerts, DIY electronics, home automation systems, and more.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSimple Wiring:\u003c\/strong\u003e Straightforward two-wire connection for fast, hassle-free installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSFM380 \/ AT3040\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eActive Piezoelectric Buzzer\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12V \/ 24V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSound Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eContinuous Tone\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAutomotive, Industrial, DIY Electronics\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWho Is This For?\u003c\/h3\u003e\n\u003cp\u003eThis buzzer is perfect for automotive enthusiasts, electronics hobbyists, engineers, and DIY makers who need a dependable, plug-and-play audible alert component. It works seamlessly in car alarm circuits, parking sensor systems, industrial control panels, and custom electronics projects.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/60cm-motorcycle-luggage-strap-elastic-helmet-bungee-net\"\u003e60cm Motorcycle Luggage Strap – Elastic Helmet Bungee Net\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the difference between an active buzzer and a passive buzzer?\u003c\/h4\u003e\n\u003cp\u003eA: An active buzzer like the SFM380 contains a built-in oscillator circuit, so it generates its own continuous sound tone as soon as DC power is applied — no external frequency signal is required. A passive buzzer, by contrast, needs an external AC or PWM signal to produce sound, giving you more control over pitch but requiring additional circuitry.\u003c\/p\u003e\n\u003ch4\u003eQ: Can this buzzer be used in both 12V car systems and 24V truck systems?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The SFM380 active piezoelectric buzzer is rated for both 12V and 24V DC operating voltages, making it compatible with standard passenger car electrical systems as well as heavier 24V truck and commercial vehicle systems.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this buzzer easy to install in a DIY electronics project?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. The active buzzer uses a simple two-wire connection — connect positive and negative leads to your DC power source and the buzzer will immediately begin producing a continuous alert tone. No additional drivers or signal generators are needed, making it ideal for beginners and experienced makers alike.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the difference between an active buzzer and a passive buzzer?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"An active buzzer like the SFM380 contains a built-in oscillator circuit, so it generates its own continuous sound tone as soon as DC power is applied — no external frequency signal is required. A passive buzzer, by contrast, needs an external AC or PWM signal to produce sound, giving you more control over pitch but requiring additional circuitry.\"}}, {\"@type\": \"Question\", \"name\": \"Can this buzzer be used in both 12V car systems and 24V truck systems?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! 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