In the world of electronics troubleshooting, few tools inspire as much curiosity and respect as the . Unlike a standard multimeter, which struggles to find shorted turns in a transformer or a flyback (LOPT), the Blue Ring Tester uses a pulsed energy technique to assess the "ringing" characteristics of an inductor.
The circuit is elegant in its simplicity, typically based on a comparator IC like the or a microcontroller like the PIC16F628A . The Core Components blue ring tester schematic diagram exclusive
| Symptom | Likely Cause | Solution | |---------|--------------|----------| | Both LEDs off | No power or dead 555 | Check voltage across pin 1 & 8 of U1. Should be 9V. | | Green LED always on | Comparator stuck high | Check R4, R6. Possibly C4 shorted (replace). | | Red LED always on | No ringing signal | Probe test points with scope. Is the 555 pulsing? | | Inconsistent results | Poor probe connections | Use shorter, thicker leads. Solder alligator clips. | | False positives on large coils | Insufficient pulse energy | Increase C2 to 22nF or reduce R3 to 68Ω (do not go lower). | In the world of electronics troubleshooting, few tools
