The floating tab thing wouldn't work, because the wire and the diode are soldered onto the same pad at both ends. It definitely looks like they're in parallel, and tot is right, this does make more sense. Zener diodes allow current in one direction and limit it in the other until the voltage reaches a threshold. They're probably using two zener diodes in opposite directions so that they can limit current in both directions until a threshold is reached. But I can tell you that this has nothing to do with the impedance of the headphone.
post #91 of 918
8/30/08 at 7:01pm