On Sat, 23 Aug 2003 10:59:52 +0100, you wrote:

>Also if your designing an amp don't forget to think about the noise
>that is put on the line level inputs.  I run an amp in my boot with a
>long stretch of line level phono interconnects, you can here noise on
>it which varies with engine revs, but only when the music is very
>quiet.  I would suggest very well screened line level leads, or
>possibly boost the voltage of the signal at the stereo end, to reduce
>the effect (there is a type of car stereo system that does exactly that)
>
>You can buy little in line filter things, but I'm not sure how they
>work and what affect they have on audio quality
>
>Ed
>
>On Saturday, August 23, 2003, at 07:33 AM, NaB25J@AOL.COM wrote:
>
>> Wow, what a fast response!
>>
>> Thanks guys, as always! And Ken, no worries about keeping me waiting -
>> I'm asking for help on your time so I don't think I'm in a position to
>> complain here. Besides, you guys all responded quite promptly in my
>> opinion.
>>
>> I found the link Neil sent ( http://www.bgsoflex.com/megasquirt.html )
>> right as he sent it by searching Google for the title of the Circuit
>> Cellar article (Jan 2002, #138). I think this is the lead I needed to
>> get this project on the road.
>>
>> So, thanks guys, you've been a big help!

Ground loops are a big problem in car systems, so most amp & crossover =
inputs are differential. Even
then there can be problems if the noise has a higher bandwidth than the =
differential amps. One
solution is to use isolating transformers.

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