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In this video, learn how to build a Smart Non-Contact AC Line & Continuity Tester at home! Unlike standard commercial testers where you must touch exposed metal parts with your finger, this DIY smart tester operates completely contactless—making it 100% safe to test live mains electricity.
Features of this DIY Smart Tester:
✔ Non-Contact AC Detection: Detects live phase wires directly through the outer insulation.
✔ Dual LED Indicators:
- Green + Red LEDs glowing = AC Phase (Live) line
- Green LED only = Neutral / Earth line
✔ Built-in Continuity Tester: Easily test fuses, diodes, LEDs, and circuit traces.
✔ Runs on a simple 3.7V rechargeable battery.
Circuit Components Used:
- 3x NPN Transistors
- 2x PNP Transistors
- Resistors (values shown in video)
- 1x Red LED & 1x Green LED
- 3.7V Li-ion Battery / Power Source
Timestamps:
0:00 - Introduction & Commercial Tester Limitations
0:17 - Circuit Components & Diagram Overview
1:59 - Assembling the Circuit
2:20 - Testing Phase, Neutral & Live AC Lines
3:14 - Safety Benefits & Continuity Testing
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