Description
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In this video, I build a simple and effective DIY ring tester circuit to detect shorted turns in transformers, inductors, and flyback coils.
Shorted turns are one of the most common and dangerous faults in switching power supplies such as buck, boost, and flyback converters. This issue is very difficult to detect using a standard multimeter (VOM), but with this circuit, you can identify the problem instantly.
This tester works by analyzing the damped oscillation (ringing) of an LC circuit. A healthy coil will produce multiple oscillations, while a faulty one with shorted turns will quickly damp out, resulting in a very low reading on the 7-segment display.
🔧 Features:
No programming required
Simple and low-cost design
Uses common components (CD4518, CD4511, LM393)
Powered by a 9V battery (portable)
Easy to build and reliable
💡 Applications:
Testing flyback transformers
Checking inductors and coils
Diagnosing switching power supply transformers
⚠️ Note: Even a single shorted turn can significantly reduce the oscillation count and damage power Mosfets if not detected in time.
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