usher R1.5 noise - diyAudio
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Old 28th December 2009, 07:39 PM   #1
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Default usher R1.5 noise

When I turn on my Usher amp I get a humming noise which seems to have increased in volume. When I first purchased the amp the hum was not very noticeable (its more of a ringing sound) I don't think it is a grounding problem. There seems to be no problem with how it functions sound is great etc. but the noise is noticeable when there is a lull in the music, does anybody have any idea what could be causing this?
Thanks David
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Old 29th December 2009, 12:10 AM   #2
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Join Date: Apr 2008
Location: Carlisle, England
If its hum then it will be 50Hz getting in somewhere.

Have a look at the power rails for excessive ripple.

Other than that try it with input shorted and see if it is the amp or something connected to it.

I find I have to connect or disconect the earth to the zero volt line depending on what I am driving the amp from. For an MP3 player i need the earth connected. For a mains powered pre amp taht is already earthed i have to disconnect the earth from the amp.
Murton-Pike Systems PCBCAD51 pcb design software.
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Old 29th December 2009, 06:25 PM   #3
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Ok, I will try what you have suggested. Thanks for your help
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