Blue Ring Tester Schematic Diagram Exclusive //top\\ Jun 2026

The damped oscillation is fed into a comparator (like an ), which converts each ring above a certain voltage threshold into a clean digital pulse. These pulses are then counted by a digital counter—in the classic design, a CD4015 dual 4‑stage static shift register or a CD4017 decade counter. The count is displayed by a ring of 10 LEDs .

Building the circuit is one thing; calibrating it is another. Here are three exclusive calibration tips for this schematic:

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By utilizing a high-efficiency tuned LC resonant tank circuit, this device provides an instant visual confirmation of an inductor's health. Below is the exclusive, comprehensive technical breakdown and schematic guide to building your own high-precision blue ring tester. Understanding the Theory of "Ring Testing"

The test probes are connected across the inductor under test ( Lxcap L sub x ). Together with internal capacitor C1cap C sub 1 , they form a parallel LCcap L cap C resonant tank circuit. The damped oscillation is fed into a comparator

This voltage is monitored by Pin 5 of the LM3914. The LM3914 compares this analog voltage against an internal reference voltage divider and lights up the 10-segment LED bar graph sequentially. Reading the Results

The Blue Ring Tester (popularized by AnaTek Corp) relies on a relatively straightforward yet brilliant design. Below is a detailed breakdown of the circuit's operation based on typical design patterns found in. 1. The Pulse Generation Section Building the circuit is one thing; calibrating it is another

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When the pulse ends, the capacitor and the inductor (your device under test, or DUT) form an LC tank circuit. The energy stored in the capacitor is transferred to the inductor and back, creating a damped sinusoidal oscillation. This is the .