I've been working with this 2.1 amp board:
http://www.parts-express.com/21-hi-f...8-vdc--320-608
And I'm having a problem with a high pitched whining noise coming from the .1 subwoofer channel.
I originally had the pot hooked up backwards I think, I reversed the in and out leads coming from the sub section. It used to make the whining noise all the time except when the pot was turned almost all the way up. Now after fixing the wiring, it makes a whining noise all the time except when the pot is at almost full volume or almost completely turned down; but anywhere in the middle where you would likely need it to be, it whines... kind of like where you can hear alternator noise coming through a car stereo.
So the next thing I was thinking of trying is to cut the ground line on the pot. I'm thinking that possibly there are ground issues floating around (see what I did there? ;) and if I cut the ground line it may mitigate the issue. I think this board is susceptible to ground/noise issues from the reviews I've read.
The 2 channel part of the deal is working fine, very well in fact. I like the amp board a lot and think that the fidelity is pretty good as well. When turned up all the way, the .1 section sounds nice and is working the voxel sub nicely.
By the way, the board is mounted on an alum. plate; but when I remove the subwoofer pot from the board it still does the same thing.
When I get home I'm going to clip the ground line, but if that doesn't work... Any other ideas?
Thanks,
TomZ
http://www.parts-express.com/21-hi-f...8-vdc--320-608
And I'm having a problem with a high pitched whining noise coming from the .1 subwoofer channel.
I originally had the pot hooked up backwards I think, I reversed the in and out leads coming from the sub section. It used to make the whining noise all the time except when the pot was turned almost all the way up. Now after fixing the wiring, it makes a whining noise all the time except when the pot is at almost full volume or almost completely turned down; but anywhere in the middle where you would likely need it to be, it whines... kind of like where you can hear alternator noise coming through a car stereo.
So the next thing I was thinking of trying is to cut the ground line on the pot. I'm thinking that possibly there are ground issues floating around (see what I did there? ;) and if I cut the ground line it may mitigate the issue. I think this board is susceptible to ground/noise issues from the reviews I've read.
The 2 channel part of the deal is working fine, very well in fact. I like the amp board a lot and think that the fidelity is pretty good as well. When turned up all the way, the .1 section sounds nice and is working the voxel sub nicely.
By the way, the board is mounted on an alum. plate; but when I remove the subwoofer pot from the board it still does the same thing.
When I get home I'm going to clip the ground line, but if that doesn't work... Any other ideas?
Thanks,
TomZ
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