The tester connects in parallel with the inductor under test, forming a resonant circuit with an internal capacitor.
The is the gold-standard DIY solution for this problem. In this exclusive breakdown, we provide the schematic diagram and explain exactly how this legendary "Q-tester" works. What is a Blue Ring Tester? blue ring tester schematic diagram exclusive
Are you planning to on a breadboard or look for a pre-etched PCB kit? The tester connects in parallel with the inductor
Usually 6 to 8 LEDs ranging from Red (bad) to Blue (excellent). How the Schematic Works blue ring tester schematic diagram exclusive