{"product_id":"mini-handheld-metal-detector-diy-soldering-kit-electronics-assembly","title":"Mini Metal Detector DIY Soldering Kit – Electronics Assembly Project","description":"\n\u003ch2\u003eMini Handheld Metal Detector DIY Electronic Soldering Kit\u003c\/h2\u003e\n\u003cp\u003eBuild your own fully functional handheld metal detector from scratch! This DIY electronic soldering kit is the perfect hands-on project for electronics students, hobbyists, makers, and anyone looking to sharpen their circuit-assembly and soldering skills. Once assembled, it detects nearby metal objects and triggers both a buzzer alarm and a flashing LED indicator — a rewarding build that also doubles as a fun, practical gadget.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e⚠️ Important Notes Before You Buy:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThis kit ships as \u003cstrong\u003eloose, unassembled components\u003c\/strong\u003e. Soldering tools and experience are required to complete the build.\u003c\/li\u003e\n  \u003cli\u003eBatteries (two button cells) are \u003cstrong\u003enot included\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003cli\u003eComponent colors may vary between batches — this does not affect function.\u003c\/li\u003e\n  \u003cli\u003eSuccess depends on the buyer's soldering experience. Please read all instructions before purchasing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Alarm System:\u003c\/strong\u003e Buzzer sound + red LED flash activate simultaneously when metal is detected.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdjustable Sensitivity:\u003c\/strong\u003e Built-in potentiometer lets you fine-tune the alarm threshold to suit your needs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Lightweight:\u003c\/strong\u003e Slim PCB (60 × 185 mm) is easy to hold and carry.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOne-Button Operation:\u003c\/strong\u003e Simple single-click activation once assembled.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Use:\u003c\/strong\u003e Great for games, entertainment, hobby security checks, and finding metal objects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3–5 V (two button batteries)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~23 mA (alarm active)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStatic Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.7 mA (no alarm)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePCB Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e60 × 185 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDetection Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3–5 cm (varies with metal surface area)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMinimum Object Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026gt; 2.5 cm for reliable detection\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBatteries\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNot included\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAll electronic components (resistors, capacitors, transistors, PCB board, buzzer, LED, potentiometer, coil, etc.) — unassembled\u003c\/li\u003e\n  \u003cli\u003eAssembly instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eSoldering iron, solder wire, and batteries must be supplied by the buyer.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWho Is This Kit For?\u003c\/h3\u003e\n\u003cp\u003eThis kit is ideal for middle school and high school electronics classes, maker-space workshops, STEM training programs, and hobbyists who enjoy building circuits from scratch. It's a straightforward yet genuinely satisfying soldering project that teaches real-world PCB assembly skills.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eYou Might Also Like\u003c\/h3\u003e\n\u003cul\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\/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\/18-pc-basswood-carving-blocks-whittling-wood-kit\"\u003e18 Pc Basswood Carving Blocks – Whittling Wood Kit for Carvers\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Does this metal detector kit come pre-assembled?\u003c\/h4\u003e\n\u003cp\u003eA: No — this is a DIY soldering kit that ships as individual loose components. You will need a soldering iron, solder wire, and basic circuit-assembly experience to build the metal detector yourself. It is designed as a hands-on learning project rather than a ready-to-use device.\u003c\/p\u003e\n\u003ch4\u003eQ: What batteries does the assembled metal detector require?\u003c\/h4\u003e\n\u003cp\u003eA: The completed metal detector runs on two standard button-cell batteries (3–5 V total). Batteries are not included in the kit and must be purchased separately.\u003c\/p\u003e\n\u003ch4\u003eQ: How far can the assembled detector sense metal objects?\u003c\/h4\u003e\n\u003cp\u003eA: The maximum detection range is approximately 3–5 cm. Larger metal surfaces can be detected at the farther end of that range, while smaller metal pieces may only be detected at closer distances. Objects must be at least 2.5 cm in size for reliable detection.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I adjust the sensitivity of the metal detector?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The PCB includes a potentiometer that allows you to adjust the alarm threshold, letting you tune the sensitivity up or down depending on your use case.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Does this metal detector kit come pre-assembled?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — this is a DIY soldering kit that ships as individual loose components. You will need a soldering iron, solder wire, and basic circuit-assembly experience to build the metal detector yourself. It is designed as a hands-on learning project rather than a ready-to-use device.\"}}, {\"@type\": \"Question\", \"name\": \"What batteries does the assembled metal detector require?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The completed metal detector runs on two standard button-cell batteries (3–5 V total). 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