Blue Ring Tester Schematic Diagram Exclusive [verified] ⟶

To get an accurate "Blue" reading, the internal resonance capacitor must be high quality (Polypropylene is best).

The Blue Ring Tester remains a staple because it finds faults that $500 digital multimeters miss. By understanding this schematic, you’re not just following a diagram—you’re mastering the physics of magnetic resonance.

Attach the tester leads across the primary winding of the transformer or the inductor. Read the LEDs: blue ring tester schematic diagram exclusive

The tester connects in parallel with the inductor under test, forming a resonant circuit with an internal capacitor.

Low Q-factor. Could be a partial short or a low-quality inductor. 6+ LEDs (Blue): High Q-factor. The component is healthy. Why This Schematic is "Exclusive" To get an accurate "Blue" reading, the internal

The circuit is elegant in its simplicity, typically based on a comparator IC like the or a microcontroller like the PIC16F628A . The Core Components

Definitive shorted turn. The component is junk. Attach the tester leads across the primary winding

Most generic testers use a simple analog decay circuit. The "Blue" version (originally popularized by Bob Parker and Anatek) uses a specific . This ensures that the difference between a good transformer and a "slightly bad" one is visually obvious, rather than a subtle flick of a needle. DIY Tips for Builders

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.

Always ensure the equipment under test is powered off and capacitors are discharged.