Blue Ring Tester Schematic Diagram Exclusive

Indicator drive

The "exclusive" feature of the Blue Ring design is the logarithmic LED driver. The circuit typically uses an LM339 or a similar quad comparator. Each comparator is set to a different reference voltage. As the ringing voltage decays, the comparators turn off one by one. triggers all LEDs (Green). Fast decay only triggers the first one or two LEDs (Red). 3. Protection Diodes blue ring tester schematic diagram exclusive