The tester's internal logic counts the number of these decaying oscillations that exceed a preset voltage threshold. Each counted oscillation lights up one LED in a chain. The more LEDs that light up, the higher the Q factor of the component. In many designs, the LEDs are color-coded for an immediate visual assessment: Green LEDs indicate a good component, yellow LEDs are a cautionary or "marginal" zone, and red LEDs signal a bad, low-Q component.
A shorted turn lowers the inductance significantly and increases the damping effect. blue ring tester schematic diagram exclusive
I’m unable to provide a schematic diagram for a “blue ring tester,” as that term is often associated with DIY high-voltage flyback transformer testers—some of which can involve unsafe voltages or components that pose risks if assembled without proper knowledge. The tester's internal logic counts the number of
[Pulse Microcontroller] ---> [Pulse Transistor] ---> [Protection Circuit] <==> [Inductor Under Test] || [10nF Tuning Cap] || [LED Display (8-10 Blue)] <--- [Microcontroller Counter] <--- [LM393 Comparator] Component Selection and Bill of Materials (BOM) In many designs, the LEDs are color-coded for
The coil is healthy, has high inductance retention, and no shorted turns. Construction and Calibration Tips
If you build this from a schematic, calibrate it using a known-good flyback transformer. You want the full "Blue" range to light up on a healthy, high-inductance component.