Blue Ring Tester Schematic Diagram Exclusive

A partial short in a yoke coil causes image distortion and horizontal transistor failure. The ring test quickly confirms yoke integrity.

Here’s the process in detail:

A healthy coil will ring for dozens of cycles, while a shorted coil will barely ring at all. Exclusive Blue Ring Tester Schematic Diagram blue ring tester schematic diagram exclusive

The simplicity of the Blue Ring Tester has spawned many DIY adaptations:

Many clones use a 10Ω resistor for R3. This overloads the 555 timer and causes false positives. Our exclusive schematic specifies , which limits current to safe levels while still providing enough energy for large flyback transformers. A partial short in a yoke coil causes

This 8-page PDF includes the complete schematic, PCB layout artwork, and a detailed theory of operation, making it the definitive resource for understanding and building the device.

If the coil is good (no shorted turns), the oscillations decay slowly. If there is a short (even one turn), the Q factor drops drastically, and the oscillations stop after 1–2 cycles. Exclusive Blue Ring Tester Schematic Diagram The simplicity

The Blue Ring Tester can be used not only to detect shorted turns but also to test the quality of capacitors (if you resonate them with a known inductor) and even to identify the resonant frequency of an LC circuit.

The circuit is elegant in its simplicity, usually based on a low-power comparator or a hex inverter (like the 74HCT14) to drive the LED scale. 1. The Pulse Generation Circuit