Blue Ring Tester Schematic Diagram Exclusive: The Ultimate DIY Guide

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By analyzing the decay rate (the number of "rings") of this oscillation, the tester measures the (Quality Factor) of the coil. High Q (Many Rings): Healthy component.

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Has anyone modified this circuit to work with an OLED display or a microcontroller for digital readout? I’m curious to see modern takes on this classic analog tool.

: Low Q (Quality Factor), typically indicating a bad or shorted winding. Yellow LEDs : Marginal or medium Q. Green LEDs : High Q, indicating a good component. Key Components & Resources

Every time the ringing waveform swings cleanly above this threshold, the open-collector output of the LM393 pulses low, pulling down the charge stored in the integration network ( R4cap R sub 4 C2cap C sub 2 3. The Integrator and Visual Driver Stage (LM3914) The pulse train from the comparator is integrated by R4cap R sub 4 C2cap C sub 2

(Voltage Comparator) - Q1: 2N22222 cap N 2222 BC547cap B cap C 547 NPN Transistor. D1: 1N41481 cap N 4148 Fast Switching Diode. LEDs: Typically LEDs (Red/Yellow/Green) to show ring strength.

Once your Blue Ring Tester is calibrated and powered on, interpreting the LED readout is straightforward: