This is a simplified representation. An actual PCB layout includes additional filtering and protection.
form a voltage divider that establishes a tiny DC reference voltage on the non-inverting input. This bias ensures that the comparator only triggers when the positive peaks of the ringing waveform exceed a specific threshold.
If you are looking for specific, in-depth , or a pre-built kit to get started, you can find a lot of information and community advice on popular electronics forums like badcaps.net and eevblog.com . If you'd like, I can help you: Source specific components based on this schematic Compare this design with other transformer tester designs
Below is the representation of the classic, highly efficient Blue Ring Tester circuit. blue ring tester schematic diagram exclusive
A momentary negative-going excitation pulse (typically generated by an onboard 555 timer circuit or a micro-controller tuned to a low frequency like 10Hz to 50Hz) shocks the tank circuit into oscillation through resistor R5cap R sub 5 2. The Comparator Stage (LM393)
Tell me which of those (or another lawful alternative) you want and I’ll proceed.
When Q1 turns off abruptly, the magnetic field in the coil collapses, generating a flyback voltage spike. The coil and its parasitic capacitance form an LC tank circuit , causing the coil to ring (oscillate) at its resonant frequency. This is a simplified representation
High-Q, fully functional transformer. Component Selection List Designator Component Value / Part Number Description IC1 5V Voltage Regulator IC2 LM393 or micro (e.g., ATTiny2313) Comparator or Programmed MCU Q1 NPN Pulse Transistor C_tank 10nF (0.01µF) 100V High-Quality Polypropylene Capacitor LED1 - LED8 Blue LEDs (or 3 Red, 2 Yellow, 3 Blue) Status Bar Graph Display R_limits 330 Ohm x8 LED Current Limiting Resistors Step-by-Step Calibration and Testing
Below is a of the classic Blue Ring Tester. Components are arranged for clarity.
The coil is functional. Lower readings are common for smaller inductors or specific yoke windings. This bias ensures that the comparator only triggers
The Blue Ring Tester is a diagnostic tool for identifying short-circuited turns in high-Q inductive components, largely based on Bob Parker's original Dick Smith Electronics K-7205 design. An updated version, which features specific schematic details like the CD4015BE shift register and optimized R7 resistance, is currently manufactured by Anatek. Detailed schematics are available in the Blue Ring Tester Assembly & User Manual Flippers.com AI responses may include mistakes. Learn more Anatek Blue Ring Tester Assembly and Review HD
(Voltage Comparator) - Q1: 2N22222 cap N 2222 BC547cap B cap C 547 NPN Transistor. D1: 1N41481 cap N 4148 Fast Switching Diode. LEDs: Typically LEDs (Red/Yellow/Green) to show ring strength.
: When the pulse hits a healthy inductor, it creates a decaying AC waveform (ringing). The tester counts how many of these oscillations exceed a specific voltage threshold.
Most generic testers only give a "Good/Bad" light. The Blue Ring schematic is superior because it provides a visual decay scale. This allows technicians to see how "clean" the inductors are. For example, a transformer might pass a basic continuity test but fail the ring test because of a single shorted winding that a multimeter simply cannot see. Step-by-Step Testing Procedure
The , originally designed by Bob Parker and produced by AnaTek , is a specialized diagnostic tool used to test high-Q inductive components like flyback transformers, SMPS transformers, and deflection yokes. It works by injecting a low-voltage pulse into a coil and counting the subsequent "rings" or oscillations to determine its Quality Factor (Q) . Circuit Overview and Schematic Details
