Mini Metal Detector DIY Soldering Kit – Electronics Assembly Project
Mini Metal Detector DIY Soldering Kit – Electronics Assembly Project
Mini Handheld Metal Detector DIY Electronic Soldering Kit
Build 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.
⚠️ Important Notes Before You Buy:
- This kit ships as loose, unassembled components. Soldering tools and experience are required to complete the build.
- Batteries (two button cells) are not included.
- Component colors may vary between batches — this does not affect function.
- Success depends on the buyer's soldering experience. Please read all instructions before purchasing.
Key Features
- Dual Alarm System: Buzzer sound + red LED flash activate simultaneously when metal is detected.
- Adjustable Sensitivity: Built-in potentiometer lets you fine-tune the alarm threshold to suit your needs.
- Compact & Lightweight: Slim PCB (60 × 185 mm) is easy to hold and carry.
- One-Button Operation: Simple single-click activation once assembled.
- Versatile Use: Great for games, entertainment, hobby security checks, and finding metal objects.
Technical Specifications
| Working Voltage | 3–5 V (two button batteries) |
| Working Current | ~23 mA (alarm active) |
| Static Current | 3.7 mA (no alarm) |
| PCB Size | 60 × 185 mm |
| Detection Range | 3–5 cm (varies with metal surface area) |
| Minimum Object Size | > 2.5 cm for reliable detection |
| Batteries | Not included |
What's in the Box
- All electronic components (resistors, capacitors, transistors, PCB board, buzzer, LED, potentiometer, coil, etc.) — unassembled
- Assembly instructions
Soldering iron, solder wire, and batteries must be supplied by the buyer.
Who Is This Kit For?
This 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.
Made in Mainland China.
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Frequently Asked Questions
Q: Does this metal detector kit come pre-assembled?
A: 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.
Q: What batteries does the assembled metal detector require?
A: 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.
Q: How far can the assembled detector sense metal objects?
A: 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.
Q: Can I adjust the sensitivity of the metal detector?
A: 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.