The "Blue Ring Tester" is a well-known diagnostic tool for electronic hobbyists and technicians, designed to test the quality (Q-factor) of high-Q inductive components like flyback transformers and SMPS coils. The specific phrase you're looking for likely refers to technical documentation or assembly manuals that include the circuit's schematic diagram. Key Technical Details
The first time you see that deep blue flash followed by a slow red decay, you'll understand why this $5 circuit is worshiped by those who know. blue ring tester schematic diagram exclusive
Most people hook it up backward. Here is the proprietary 3-step ritual: The "Blue Ring Tester" is a well-known diagnostic
Probe Part:
| Reference | Value | Notes | |-----------|-------|-------| | U1 | NE555 | Timer IC | | U2 | LM393 | Dual comparator (one used) | | D1, D2 | 1N4148 | Fast switching diodes | | D3 | Red LED | Fault indicator | | D4 | Green LED | Pass indicator | | C1 | 100nF | Ceramic disc | | C2 | 10nF | Polyester | | C3 | 100µF / 16V | Electrolytic | | C4 | 10pF | Ceramic (critical) | | R1 | 10kΩ | 1/4W | | R2 | 1kΩ | 1/4W | | R3 | 100Ω | 1/4W | | R4 | 1MΩ | 1/4W | | R5 | 47kΩ | 1/4W | | R6 | 10kΩ | 1/4W | | R7 | 330Ω | 1/4W | | R8 | 220Ω | 1/4W | | RV1 | 10kΩ trimpot | Calibration | | Lx | Coil under test | External connection | | Power | 9V battery (or 9-12V DC) | Regulated recommended | How to Read the "Exclusive" Test (Stop Guessing)