Hi all.

The Power-Over-Ethernet (POE) injector for a ZyXEL wireless network
link has just failed. New, or replacement, POEs are not easy to locate
nor is information on these devices. There is not any label or other
markings indicating model numbers or other information.
I opened the POE unit and discovered that it contains an AP34063
switching regulator, as would be expected, but also an LM358D (dual
OpAmp).
Does anyone have any idea why a POE unit would contain an OpAmp?

Regards.

Mike