Replace the red LED with a piezoelectric buzzer in parallel with a red LED. A shorted coil then produces a loud beep—useful when your eyes are on the probe.
A partial short in a yoke coil causes image distortion and horizontal transistor failure. The ring test quickly confirms yoke integrity.
: Indicate a healthy component with many rings. blue ring tester schematic diagram exclusive
The Blue Ring Tester is a must-have for any electronics repair technician or enthusiast. By using the provided above, you can build a reliable tool that makes diagnosing difficult transformer faults easy and efficient.
Once your Blue Ring Tester is calibrated and powered on, interpreting the LED readout is straightforward: Replace the red LED with a piezoelectric buzzer
The Blue Ring Tester functions based on the principles of parallel resonance and damping. 1. Pulse Generation
Add a 3-position switch to select C2 values: The ring test quickly confirms yoke integrity
: The tester uses 8 LEDs to indicate the Q-factor. Green : High Q (Good). Yellow : Medium/Marginal Q. Red : Low Q (Bad). No Lights : Absolute short circuit.
To get an accurate "Blue" reading, the internal resonance capacitor must be high quality (Polypropylene is best).
: In later design revisions, certain resistors (like R7) were modified from 2.2 kΩ to 510 Ω to enhance sensitivity for low-impedance devices like horizontal deflection yokes.
Connected in parallel with a high-quality, low-loss film capacitor (typically 10nF, 100V metallized polyester).