Hi guys,
Need your inputs about on how to measure noise in USB and how to remove it.Thanks in advance.
Need your inputs about on how to measure noise in USB and how to remove it.Thanks in advance.
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Re: Usb Noise
you would measure it with a scope
remove it with a higher grade filter cap with less ripple and lower ESRCap Datasheet Depot: http://www.paullinebarger.net/DS/
^If you have datasheets not listed PM me -
Re: Usb Noise
or USB cables that have a ferrite filter might helpCap Datasheet Depot: http://www.paullinebarger.net/DS/
^If you have datasheets not listed PM meComment
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Re: Usb Noise
thanks for the helpComment
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Re: Usb Noise
For USB 2.0, you would need a high frequency scope with a USB tolerance indicator.My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.Comment
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Re: Usb Noise
Series L, shunt C. Be careful the L you pick (and the C too) if you're going to put them in series with the D+/D- lines as you can add too much impedance and affect the USB signals. Try putting the filters on the power and ground first.
Are you trying to prevent USB signals from radiating out, or prevent external RFI from getting in?Comment
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Re: Usb Noise
Hi sixer, the answer is both.Comment
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Re: Usb Noise
Are you worried about noise in the power or in the signal?
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Using a cable with a ferrite would fix both.
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Re: Usb Noise
xformer: I think some more information about your situation will help us help you here. Is this a product you are designing or a COTS product you have purchased? Are you having trouble passing FCC Part 15 or do you have some sort of interference/RFI problem that you are trying to mitigate? If so, what is the source of the offending radiation and/or what are the devices that this USB product is offending? What is the product in question (or at least the chipset)? Be verbose
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Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached.... -
Hi all,
I am working on a sound processor, it tends to overheat so I fitted a fan inside. The fan is connected to the +15V of the PSU via a DC-DC converter based on the LM2596 to reduce the voltage to around 10.5V.
Unfortunately the analogue circuitry is picking up the noise from the fan in two ways:
1. The fan is close to the analogue section, the motor itself gets into the outputs so I'll have to move it somewhere else
2. Even with the fan running outside of the case, there is still some noise which is clearly going back to the processor via power line.... -
Surprisingly enough, this receiver doesn't have the DSP chip issue. The HDMI board does not get hot, and sound over HDMI works fine.
Regardless of the input, the right channel has noise that is clearly noticeable even on average volume level. The only cases when there's no noise is when VCR input is selected (some tracks on the board are damaged, maybe that's why), or if HDMI input is selected but nothing plugged into it. In all other cases, even when no input is connected I still have the noise.
There's some logic behind it. As soon as I select an input I get only left...04-23-2025, 10:09 PM -
Hello
I have since a long time a Philips HTS8010S/01 which has been old but was doing the job.
Since a few days, it starts by making a weird "static" nois when switches on for a few seconds to a minute and then works like a charm.
Noise loudly outputs from the 3 channels, even if no signal is sent by the controler.DVD to the subwoofer/amp unit.
I was thinking of a soldering that was starting to be damaged and that was only doing the job after a few seconds of heating, most probbaly on the power board
Removed each of tyhe boards
...02-08-2025, 08:22 AM -
Hi, i have a Panasonic Cf-W5 with the bios password, I tried remove cmos but problem didnot solve.
I uploaded the picture after remove cmos battery, It look like this is a Phoenix bios. The bios dump file in the link i attached
Please help me remove bios password.
Thank you so much
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