Any ideas what the matter is ?
325i Convertible with extremely loud squeal in stereo
Moderator: martauto
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matsemanuel
- E30 Zone Newbie
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- Joined: Sat Oct 31, 2015 11:00 pm
I have a 1989 BMW 325i Convertible. All original (US spec) with no modifications. Recently I have had problems with the stereo transmitting a high pitch squeal whenever the radio is switched on. It does not always happen but when it does it really cuts your eardrums in half !!
Any ideas what the matter is ?
Any ideas what the matter is ?
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Rodderz
- E30 Zone Addict
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- Joined: Thu Nov 24, 2005 11:00 pm
- Location: Southampton
Sounds like a Yoko Ono CD to me?
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matsemanuel
- E30 Zone Newbie
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It is a 1989 car so no CD installed! The sound is worse than Yoko Ono. Must be something electronic/electric going wrong. Very irritating as it comes and goes...
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HairyScreech
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Feed back from the ignition or alternator perhaps?
2.8 development thread http://www.e30zone.net/modules.php?name ... c&t=170822
m3.3.1 m20 thread - now running, chip needed - any volunteers?
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m3.3.1 m20 thread - now running, chip needed - any volunteers?
http://www.e30zone.net/modules.php?name ... =viewtopic&
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Brianmoooore
- E30 Zone Team Member
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If it is, the pitch will vary with engine revs.HairyScreech wrote:Feed back from the ignition or alternator perhaps?
If it doesn't, it sounds like an internal fault in the radio. Probably a failed decoupling capacitor, resulting in a positive feedback loop = oscillation.