Blue Ring Tester Schematic Diagram Exclusive 🆕 💎

A blue ring tester is a handheld electrical tester used to detect the presence of live AC voltage without direct contact with conductors. The device typically indicates voltage via a glowing “blue ring” neon/LED indicator or via capacitive-sensing electronics that drive a visual indicator. This write-up focuses exclusively on the schematic/design principles, key circuit blocks, component selection, and a compact reference schematic suitable for a hobby or repair-level build (mains-awareness required).