DIY car audio noise
Printed From: the12volt.comForum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=141795
Printed Date: April 29, 2024 at 5:52 AM
Topic: DIY car audio noise
Posted By: doris212
Subject: DIY car audio noise
Date Posted: September 30, 2016 at 2:26 AM
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 https://www.kynix.com/Product/36.html">a 4700 uF capacitor in parallel with the power wires. Like this (excuse the paint drawing)
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:
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?
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:
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?
Replies:
Posted By: DYohn
Date Posted: October 22, 2016 at 10:29 AM
Posted By: i am an idiot
Date Posted: October 22, 2016 at 9:15 PM
Posted By: conpar
Date Posted: October 31, 2016 at 1:04 AM