I Turned an Empty Whiteboard Marker into a Non-Contact AC Voltage Tester
Автор: In The Making
Загружено: 2026-02-06
Просмотров: 23
Описание:
In this video, I’ll show you how to build a simple DIY non-contact AC voltage tester using just an empty whiteboard marker and a few inexpensive components. This project uses a Darlington transistor circuit to amplify tiny electrical signals so you can detect AC voltage without touching live wires!
👉 Full written guide with parts list, theory, and photos:
https://inthemakingbuilds.com/how-to-...
🛠️ What You’ll Learn
✔ The theory behind Darlington transistor amplification
✔ How a non-contact voltage tester works
✔ All parts you need (marker, transistors, resistor, LED, antenna wire)
✔ Step-by-step build from start to finish
✔ Live testing and final demo
📋 Parts Needed
💡 Empty whiteboard marker (used)
🔹 3 × C1815 NPN transistors (or equivalent)
🔹 1 × 2 kΩ resistor
🔹 1 × red LED
🔹 ~8–10 inches (20–25 cm) copper wire antenna
(Get the full list + instructions on the blog!)
📌 Safety First
This is a non-contact tester — you won’t touch live wires. Always work safely around AC mains.
If you found this useful 👍, don’t forget to LIKE, SHARE, and SUBSCRIBE for more DIY electronics builds!
📱 Follow for updates and more projects!
🌐 Full guide: https://inthemakingbuilds.com/how-to-...
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