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A microcontroller (or a 555 timer in older designs) sends a short positive pulse (few microseconds) to the base of transistor Q1 (2N3904). Q1 turns on, pulling current through the test coil (Lx) to ground.
Leave the test leads open. No LEDs should light up. blue ring tester schematic diagram exclusive
Would you like a or Arduino code for a digital Blue Ring Tester?
The transformer winding is completely short-circuited or completely open. Tuning and Calibration Tips This public link is valid for 7 days
resistor directly into the LC tank, initiating the ringing waveform.
: The Test + and Test - leads connect across the unknown inductor. A Can’t copy the link right now
The coil is healthy, has high inductance retention, and no shorted turns. Construction and Calibration Tips
If the winding is shorted, even by a single turn, the energy is quickly dissipated as heat, and the ringing stops almost immediately. Threshold Counting:
Every time the ringing waveform peaks above this threshold, the comparator outputs a clean, digital square wave pulse.
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