Blue Ring Tester Schematic Diagram Exclusive ((better)) May 2026
Blue Ring Tester is a specialized diagnostic tool used to test the health of high-Q (low loss) inductive components, such as flyback transformers (LOPT), deflection yokes, and switch-mode power supply (SMPS) transformers. Anatek Instruments
Ignition coils operate at high voltage and are prone to internal arcing (carbon tracking) which creates a shorted turn. Test them out of the vehicle with this circuit. blue ring tester schematic diagram exclusive
- Tone generator output: connects to the probe through a cable
- Probe: connects to the wiring under test
Oscillation Detection
: When the pulse hits a healthy inductor, it creates a decaying AC waveform (ringing). The tester counts how many of these oscillations exceed a specific voltage threshold. Blue Ring Tester is a specialized diagnostic tool
- Power Source: 9V battery (or 6V battery)
- Oscillator: NE555 or similar IC ( astable multivibrator)
- Resistors: R1 (1kΩ), R2 (10kΩ), R3 (100Ω)
- Capacitors: C1 (10uF), C2 (100nF)
- Inductor: L1 (10mH)
- Switch: S1 (pushbutton switch)
exclusive schematic diagram
The Blue Ring Tester is a masterpiece of analog design. With fewer than 20 components, it solves a problem that stumps $10,000 impedance analyzers in certain scenarios. The we've shared today has been verified against original units and corrected for modern component availability. Tone generator output: connects to the probe through
in-circuit tests
or less is applied to the component. This low voltage allows for many without damaging other sensitive electronics.