Blue Ring Tester Schematic Diagram Exclusive May 2026

A: Indirectly, yes. If you swap the inductor and capacitor positions, you can test capacitors for high ESR (equivalent series resistance). That's a separate article.

Enter the Blue Ring Tester. This brilliant, low-cost device uses a pulse ringing test to identify shorted turns instantly. Today, we are providing an along with a component-level explanation of how it works. Exclusive Content Notice: The schematic presented below has been redrawn and refined from original service manuals and reverse-engineered vintage units. It includes component values that are often missing or incorrect in other online sources. Part 1: The Exclusive Blue Ring Tester Schematic Diagram Below is the complete schematic diagram of the classic Blue Ring Tester. This design uses a 555 timer, a comparator (LM393), and a handful of passive components to generate a short ringing pulse and analyze the decay. blue ring tester schematic diagram exclusive

A: No. An LC meter measures inductance and capacitance. The Blue Ring Tester measures Q factor and loss—a different parameter. A: Indirectly, yes

The ringing signal is AC-coupled via C4 and clamped by D1, D2 to protect the comparator. The LM393 compares the ringing waveform to ground. For a healthy coil, the ringing crosses zero many times. The comparator outputs a series of pulses for each zero-crossing. Enter the Blue Ring Tester