Blue Ring Tester Schematic Diagram Exclusive ✦ Must Try

Whether you are repairing a vintage arcade monitor, a high-end audio amplifier, or an industrial power supply, this tool will save you hours of guesswork. Build one. Keep it on your bench next to your multimeter. And when a junior technician asks, "How do you know the transformer is bad?" you can smile and say, "I heard its ring." This article is for educational purposes. Always observe safety procedures when working with high-voltage circuits. Flyback transformers and SMPS primaries can store lethal charges even when unplugged.

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. blue ring tester schematic diagram exclusive

A acts as a secondary winding with a dead short. This dramatically reduces the Q factor. The ringing stops after just 1 or 2 cycles instead of 10 or more. Circuit Operation Step-by-Step Step 1: The Pulse The 555 timer (U1) generates narrow, low-duty-cycle positive pulses (approx. 10µs wide) at a frequency of about 100Hz. These pulses are fed through a current-limiting resistor (R3) to the tank circuit. Whether you are repairing a vintage arcade monitor,

A: No. An LC meter measures inductance and capacitance. The Blue Ring Tester measures Q factor and loss—a different parameter. And when a junior technician asks, "How do