I was able to suppress the ignition noise in a car audio installation that was done by the know it all individuals.
The owner want an equalizer to be installed. This is where problems lies, The equalizer is generating ignition wine. Since without it, there is no noise that can be heard.
So I believe the noise is there but inaudible and the equalizer is boosting the noise level to the audible range.
I checked the equalizer, removed the power amp and converted it to a signal level one ( before it was speaker level). I did notice there was no power inductor filter as I have seen on car audio players. A laminated core inductor placed at the 12V line.
I have yet to figure out if the power line is injecting the noise or it is from the signal lines.
The signals are all fully shielded RCA cables. Before it was just plain wires and wired from speaker level signals.
Now the Audio is much cleaner than before .
I will post some scope pictures of the noise and need to figure out a filter that can be placed in the power line to filter out the noise.
Before that does anybody have any idea on a filter design that I could use ?
The owner want an equalizer to be installed. This is where problems lies, The equalizer is generating ignition wine. Since without it, there is no noise that can be heard.
So I believe the noise is there but inaudible and the equalizer is boosting the noise level to the audible range.
I checked the equalizer, removed the power amp and converted it to a signal level one ( before it was speaker level). I did notice there was no power inductor filter as I have seen on car audio players. A laminated core inductor placed at the 12V line.
I have yet to figure out if the power line is injecting the noise or it is from the signal lines.
The signals are all fully shielded RCA cables. Before it was just plain wires and wired from speaker level signals.
Now the Audio is much cleaner than before .
I will post some scope pictures of the noise and need to figure out a filter that can be placed in the power line to filter out the noise.
Before that does anybody have any idea on a filter design that I could use ?