Blue Ring Tester Schematic Diagram Exclusive May 2026

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 work with power supplies, CRT monitors, or motor drives, you know that a "shorted turn" in a transformer or inductor is a technician's nightmare. A standard multimeter will show perfect continuity, but the component will fail under load.

The Ultimate Guide to the Blue Ring Tester: Exclusive Schematic Diagram and Operation blue ring tester schematic diagram exclusive

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

Usually a momentary switch or a transistor-driven pulse that kicks the LC circuit into oscillation. Most generic testers use a simple analog decay circuit

The Blue Ring Tester is a specialized "in-circuit" diagnostic tool. It performs a (or Q-test). By injecting a pulse into a coil, it measures how many times the energy "echoes" or "rings" before dying out. Healthy Coil: Rings many times (lighting up all the LEDs).

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" DIY Tips for Builders If you work with

A series of voltage comparators (or software thresholds) that count how many oscillations exceed a certain voltage level.

Definitive shorted turn. The component is junk.

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