"plugged" or "unplugged" ?archie456 wrote:Hi,
I've plugged everything except the power and the hiss is still there, its certainly not coming from the TV.
archie456 wrote:This link is a recording of the sound.
Its not that easy to hear, its the buzz thats audible throughout this recording, but with the background noise its difficult to hear.
https://drive.google.com/folderview?id= ... sp=sharing
In a room with noise its unnoticeable, but in a quite room its easily to hear - I was thinking of using the Pi2 in our bedroom - but not with this noise.
RaTTuS - Whats the best way to ground the Rpi2 to try your test?
Plugwash - its definitely not the power supply...
Azerty - I've no idea what any of that means, is it fixable?
I assume, by the replies to this topic I'm the only one experiencing this, and its not a common issue - in that case I guess I should RMA it and new a new one.
I'm know (if not fault) hdmi transferring audio with digital data.archie456 wrote:I'm connecting to the TV via HDMI.
But if I disconnect all plugs apart from the power the noise is still made, so I know its not the TV.
I agree, I think its a fault board.
Camera flash issue related about mirrored like equipment near the power input ( micro usb ). Black paint or plastic molten drop can easily block light input. Only cover for mirrored like equipment is enough for fix flash bug.rpiswag wrote:mandrewpi This will probably not be fixed and many bugs are fixed before the Pi 2B. This is not a widely reported problem so it doesn't need to be fixed. Unlike the Pi 2B's problem with camera flashes because of the u16 that is a minor problem unless you take your Pi 2B to the red carpet. I bought mine and I have had no problems but charging my code to improve with the arm_V7 CPU. Don't worry about with hardware bugs just buy one I did and mine is fine and I run it 24/7 non stop.
The capacitors used on Pi B+ / Pi 2 exhibit piezoelectric behaviour. In fact the issue that the OP describes is almost certainly due to MLCCs "flexing" under the applied voltage.mahjongg wrote:some capacitors can exhibit piezoelectric behavior, that is they can contract/expand according to the electric field (voltage) they are exposed to, but to be discernible to the human ear the frequency of this field must be in the hearable range of 30 to 3000 Hz, most signals are not. Another possibility is inductors, of which coil segments or wires can attract/repel, but the switching power converters of a PI use frequencies far beyond human hearing.