[sdiy] (OT) buzzing in my car cig-lighter...

[Reverend djbluE (Chromatest)]

hi all, I've been using my portable CD player in my car to listen to
tunes lately.. I have a crappy aiwa casette deck (never buy *anything*
aiwa!!!) in my car, and something in the casette part died recently..
luckily (the reason I bought the deck) is that it has a mini-stereo
jack on the front panel to plug in other things (CD, MD, DAT, etc)...
so I've been using my CD player here... but....

I also use a cigarette lighter power adaptor to power the CD player,
unfortunately, this introduces a buzz (ignition noise prolly).  when
powered by batteries it is gone, but as soon as I use the adaptor it's
there... so.. I don't actually have a cig lighter though, never had
one, don't smoke, etc... is there a way to put a filter on the lighter
jack?  a couple caps and resistor to smooth the line or something?  

I don't know if it matters, but the line is independant from the
ignition.. it's live even if the key is off.

thanks all

-ben