{"product_id":"diy-4-digit-led-electronic-clock-soldering-kit-dc-3-7v-5-5v","title":"DIY 4-Digit LED Electronic Clock Soldering Kit | DC 3.7V–5.5V","description":"\u003ch2\u003eBuild Your Own LED Clock – Fun DIY Soldering Kit for Electronics Enthusiasts\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eLOTHYE 4-Digit LED Electronic Clock Kit\u003c\/strong\u003e is the perfect hands-on project for hobbyists, students, and electronics enthusiasts who want to sharpen their soldering and circuit assembly skills. Build a fully functional digital clock from scratch using quality through-hole components on a military-grade FR-4 PCB.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e⚠️ Please Note:\u003c\/strong\u003e This kit is designed for buyers with prior electronics\/soldering experience. We guarantee all components are in good condition before shipping, but successful assembly depends on the builder's skills. Please read all instructions carefully before beginning.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e DC 3.7V – 5.5V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisplay:\u003c\/strong\u003e 0.44-inch red 4-digit LED tube (clock-dedicated)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMain Control Chip:\u003c\/strong\u003e Imported AT89C2051 microcontroller\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePCB:\u003c\/strong\u003e 1.6mm thick military-grade FR-4 board\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTimekeeping Accuracy:\u003c\/strong\u003e Approximately ±3 seconds per month\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePower Tip:\u003c\/strong\u003e For long-term use, a DC power adapter is recommended over AA batteries to reduce power consumption\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFunctions \u0026amp; Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eTime Display:\u003c\/strong\u003e Hours and minutes shown clearly on bright red LED digits\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eIndependent Adjustment:\u003c\/strong\u003e Hours and minutes can be set separately\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eSeconds Correction:\u003c\/strong\u003e Fine-tune timekeeping accuracy at any time\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eSpeed Fine-Tune:\u003c\/strong\u003e Clock speed adjustable across 0–9 gears (default: gear 5)\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eDual Alarm Clock:\u003c\/strong\u003e Two independently switchable alarms\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eHourly Chime:\u003c\/strong\u003e Toggleable hourly reminder function\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eCountdown Timer:\u003c\/strong\u003e Count down up to 99 minutes with end alarm\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eStopwatch:\u003c\/strong\u003e Full stopwatch with pause and clear functions\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eCounter:\u003c\/strong\u003e Records button presses or external pulse counts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Choose This Kit?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e🔧 Relatively low component count — beginner-friendly layout with a high assembly success rate\u003c\/li\u003e\n  \u003cli\u003e🔧 No debugging required after correct assembly\u003c\/li\u003e\n  \u003cli\u003e🔧 High-quality AT89C2051 chip for reliable and accurate performance\u003c\/li\u003e\n  \u003cli\u003e🔧 Great for learning PCB soldering, circuit theory, and microcontroller basics\u003c\/li\u003e\n  \u003cli\u003e🔧 Makes a fantastic gift for makers, engineering students, and DIY hobbyists\u003c\/li\u003e\n\u003c\/ul\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\/16-inch-vintage-silent-wall-clock-gold-shabby-chic-home-decor\"\u003e16-Inch Vintage Silent Wall Clock – Gold Shabby Chic Decor\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: Is this DIY electronic clock kit suitable for beginners with no soldering experience?\u003c\/h4\u003e\n\u003cp\u003eA: This kit is best suited for buyers who already have basic electronics and soldering experience. The component count is relatively low and the PCB layout is straightforward, making it more accessible than advanced kits — but some prior knowledge of circuit assembly is recommended for a successful build.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What power source does the 4-digit LED clock kit require?\u003c\/h4\u003e\n\u003cp\u003eA: The kit operates on DC 3.7V to 5.5V. It can run on 3 AA batteries for short-term use, but for extended operation a DC power adapter is strongly recommended to avoid rapid battery drain.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does the assembled clock kit come with all necessary components?\u003c\/h4\u003e\n\u003cp\u003eA: Yes, the kit includes all electronic components needed to complete the assembly, including the AT89C2051 microcontroller chip, the 4-digit red LED display tube, and the FR-4 PCB board. All parts are inspected and confirmed in good condition before shipping.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What functions does this DIY electronic clock support beyond just showing the time?\u003c\/h4\u003e\n\u003cp\u003eA: Once assembled, the clock supports dual independent alarms, a countdown timer (up to 99 minutes), a stopwatch with pause and clear, an hourly chime, a pulse\/button counter, and fine-tuning of clock speed across 10 gear levels — making it a multi-function electronic learning project.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Is this DIY electronic clock kit suitable for beginners with no soldering experience?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This kit is best suited for buyers who already have basic electronics and soldering experience. 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