R
Robert Latest
- Jan 1, 1970
- 0
Hello,
I just bought a used Wi-Fi router / ADSL modem combo. Everything works fine,
except that after the thing has warmed up for about 20 minutes, it emits a
faint, audible whine of a few kHz that's pretty annoying once you start
listening to it (as one does, and doesn't stop any more. I find myself
"searching" for that noise once I enter the room where the thing is).
I'm guessing that the noise comes from some switched POL regulator inside
the device. The wall-wart is one of the old, clunky, linear ones so that's
out. Question is what can be done about it, other than moving the bugger to
the attic. Something inside the case must be oscillating mechanically, and
the only thing I can think of that would do that is some inductor of the
switcher. My idea is to locate something that looks like a magnetic
component and soak it in liquid epoxy.
Good idea or bad idea?
robert
I just bought a used Wi-Fi router / ADSL modem combo. Everything works fine,
except that after the thing has warmed up for about 20 minutes, it emits a
faint, audible whine of a few kHz that's pretty annoying once you start
listening to it (as one does, and doesn't stop any more. I find myself
"searching" for that noise once I enter the room where the thing is).
I'm guessing that the noise comes from some switched POL regulator inside
the device. The wall-wart is one of the old, clunky, linear ones so that's
out. Question is what can be done about it, other than moving the bugger to
the attic. Something inside the case must be oscillating mechanically, and
the only thing I can think of that would do that is some inductor of the
switcher. My idea is to locate something that looks like a magnetic
component and soak it in liquid epoxy.
Good idea or bad idea?
robert