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DIY car audio noise


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doris212 
Member - Posts: 1
Member spacespace
Joined: September 25, 2016
Location: Washington, United States
Posted: September 30, 2016 at 2:26 AM / IP Logged Link to Post Post Reply Quote doris212
I have a hobby in electrical engineering so I built my own car audio system given the fact that it didn't have any before. It's basically two pairs of PC speakers adapted with some resistors and regulators to work on DC 11-15V from my car. In order to eliminate any ripple and noise I have added http://www.kynix.com/Product/36.html">a 4700 uF capacitor in parallel with the power wires. Like this (excuse the paint drawing)
DIY car audio noise -- posted image.
They are low power enough (around 30W max) to work without any noise when the car is running (noise induced by the alternator) as well as when it's on battery only (of course, no noise).
My problem is when the device i'm using is charging from the SAME power lines, all the noise-filtering the capacitor is doing suddenly vanishes.
This is when my problem occurs:
DIY car audio noise -- posted image.
My skills aren't advanced enough to figure out what's going on, so I'm asking here after 1 month of research: How do i eliminate the ripple from when my device is charging and plugged into the audio system at the same time?
DYohn 
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Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: April 22, 2003
Location: Arizona, United States
Posted: October 22, 2016 at 10:29 AM / IP Logged Link to Post Post Reply Quote DYohn
No offense but the best solution would be to install car audio equipment. :)
You have a ground loop, likely because the powered computer speakers use power neutral and speaker negative in parallel. You likely will not be able to fix that.
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i am an idiot 
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Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
conpar 
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Stock Boy spacespace
Joined: October 31, 2016
Location: Ontario, Canada
Posted: October 31, 2016 at 1:04 AM / IP Logged Link to Post Post Reply Quote conpar
Great links.. Thanks for sharing

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