The is a legendary diagnostic tool among electronics repair technicians, engineers, and hobbyists . It offers an incredibly simple yet highly effective way to test high-Q inductive components—such as flyback transformers, deflection yokes, SMPS (switched-mode power supply) transformers, and ballast chokes—without removing them from the circuit board.
: Typically used for pulse generation and as a sensitive comparator for the ringing waveform.
For a reliable, noise-free operation, building the circuit on a custom Printed Circuit Board (PCB) is highly recommended. Many hobbyists have designed their own PCBs based on the original schematic. For example, Tommaso Caligari designed a PCB using EasyEda and had it manufactured by JLCPCB. The official documentation also provides the exact PCB artwork for creating your own board using the toner transfer method. blue ring tester schematic diagram exclusive
: If the inductor is healthy, the energy bounces back and forth between the inductor and capacitor, creating a decaying AC voltage waveform (ringing).
The official assembly manual and schematic can be found on the AnaTek website. Many discussion forums, such as PIGOO and All About Circuits, have preserved links to these PDFs. The is a legendary diagnostic tool among electronics
The commercial Blue Ring Tester (originally designed by Bob Parker and sold by AnaTek) uses a cleverly simple circuit that later inspired countless DIY versions. The core principle can be broken down into four stages:
Produces a long series of damped oscillations (rings) when pulsed. For a reliable, noise-free operation, building the circuit
A Blue Ring Tester works by sending a very short, sharp electrical pulse, or "ring," into the component under test and then counting how many times it oscillates, or 'rings,' afterward.
In the world of electronics troubleshooting, few tools inspire as much curiosity and respect as the . Unlike a standard multimeter, which struggles to find shorted turns in a transformer or a flyback (LOPT), the Blue Ring Tester uses a pulsed energy technique to assess the "ringing" characteristics of an inductor.