If you are building this circuit on a custom PCB, keep the traces between the test leads, the tank capacitor, and the comparator input pins as short as possible to minimize stray inductance and resistance.
: If the inductor is healthy (high Q), the oscillations will decay slowly, creating a long train of pulses (ringing). If the inductor has a shorted turn, the energy is quickly dissipated as heat within the short, causing the oscillations to damp out almost immediately. blue ring tester schematic diagram exclusive
The Blue Ring Tester is an essential, cost-effective tool for any electronics enthusiast or professional who regularly works with flyback transformers and switch-mode power supplies. Its simple design and intuitive LED display make it easy to build yourself. For more insights and community discussions, you can explore the following active electronics forums where enthusiasts and professionals share their experiences: If you are building this circuit on a
Has anyone modified this circuit to work with an OLED display or a microcontroller for digital readout? I’m curious to see modern takes on this classic analog tool. The Blue Ring Tester is an essential, cost-effective
What specific (flyback, SMPS transformer, crossover coil) are you trying to test?
The device uses a sequence of eight tri-color LEDs to represent the number of oscillations (rings) detected when a test pulse is applied to a coil. This allows for a fast "go/no-go" diagnosis that a standard ohm meter cannot perform. Ring tester for Coils and Transformers.