Blue Ring Tester Schematic Diagram Exclusive

with fellow repair enthusiasts. The knowledge of these classic test circuits must not fade into obscurity.

If you find a random "Blue Ring Tester schematic" online showing a single transistor and a white LED— That is a $2 continuity tester. The exclusive design requires a bipolar pulse (positive AND negative kick) to induce true ringing . Without the complementary pair, you are just measuring DC resistance. blue ring tester schematic diagram exclusive

A timer circuit (often using a U1 timer or discrete transistors) creates the fast voltage pulse required to "kick" the inductor into resonance. with fellow repair enthusiasts