Blue Ring Tester Schematic Diagram Exclusive !!better!! Jun 2026

delay(100);

Acts as the primary inductor in the resonant circuit. Capacitor ( ): Forms the LCcap L cap C resonant tank circuit with the DUT.

The component may have partial degradation, a high-resistance short, or it is a low-Q design. Good blue ring tester schematic diagram exclusive

If you build this from a schematic, calibrate it using a known-good flyback transformer. You want the full "Blue" range to light up on a healthy, high-inductance component.

: 9V Alkaline battery regulated down to 5V via an LM78L05 regulator. Step-by-Step Construction Guide delay(100); Acts as the primary inductor in the

: When powered by a 9V battery, one or two red LEDs flickering indicates the unit is "ON" and ready for testing.

The circuit drives a small analog meter or an LED array (depending on the specific revision). The meter deflection is proportional to the decay time of the oscillation. Good If you build this from a schematic,

The Blue Ring Tester counts these oscillation peaks and displays them on a LED bar graph. Exclusive Blue Ring Tester Schematic Diagram

This tester is used to detect shorted turns in high-frequency transformers, flyback transformers (LOPT), and switching power supply transformers without needing an LCR meter.

| | Component Description | Quantity | | :--- | :--- | :--- | | IC1 | LM393 Dual Comparator (or 1/2 LM358) | 1 | | IC2 | CD4015 Dual 4-Stage Shift Register | 1 | | Q1, Q2 | General-purpose transistors (e.g., BC547, BC557) | 2 | | D1-D8 | LEDs: 3 Green, 2 Yellow, 3 Red | 8 | | C1, C2 | Ceramic capacitors (values vary, e.g., 100nF) | 2 | | R1-R10, etc.| Resistors: 1/4W, values ranging from 100Ω to 1MΩ | ~15 | | R19 | Trimpot for calibration | 1 | | Misc. | Power Switch, 9V Battery Clip, Test Probes, PCB | - |

(dual 4-stage shift register) or similar ICs to control the 8-LED sequence. Pulse Generation: A push-button activates a timer circuit (often using a