Blue Ring Tester Schematic Diagram Exclusive [extra Quality] File

The microcontroller counts how many pulses occur within a fixed window (usually a few milliseconds after the initial pulse).

Older schematics omit the calibration trimpot entirely. Without RV1, the tester is unreliable for different inductance ranges. Our schematic includes a in series with R5. Calibration procedure:

Standard versions of the "Blue" Anatek or Dick Smith style testers typically include: Anatek Blue Ring Tester Assembly and Review HD blue ring tester schematic diagram exclusive

| 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 |

It is arguably the most efficient tool for testing CRT TV flyback transformers (LOPT) for internal shorts. Conclusion The microcontroller counts how many pulses occur within

The tester identifies shorted turns in coils that standard ohmmeters cannot detect. It works by injecting a low-voltage pulse (approx. 600–650mV) into the component and counting how many times the circuit "rings" (oscillates) before the signal decays. A higher number of lit LEDs indicates a higher Quality (Q) factor and a healthy component. 1. Technical Schematic Analysis The circuit, originally designed by Bob Parker

The circuit is designed for high sensitivity and safety, operating at low voltages that allow for in-circuit testing without damaging sensitive semiconductors. Integrated Logic: Our schematic includes a in series with R5

: When the test leads are shorted together, zero LEDs should light up. When connected across a known good flyback primary winding, all 8 to 10 LEDs (the full "blue ring") should illuminate brightly. How to Read the Test Results

To truly appreciate this circuit, you must understand the principle.

I’ve reverse-engineered and enhanced this schematic from a rare 1990s German repair manual. Build it on perfboard in 20 minutes. Test a known good inductor. Then test a dead CFL ballast transformer.

A: Sometimes, but other components parallel to the coil (resistors, other windings) dampen the ring. For reliable results, disconnect one leg of the coil.