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| CyberCharlie Member Since: 01 Jul 2010 Location: Reading Posts: 140   
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Hi all,
I drive a 2007 Defender. I have replaced the cigarette lighter in the dashboard with this: http://www.ebay.co.uk/itm/360886729112?ssP...1497.l2649 It has a dual USB port, 1 with 1000 mAmp output and the second with 2100 mAmps. My phone has a 2000 mAmps battery so it should be able to be charged (faster) by the 2.1 Amps socket. Which it does, so no problems at all in that field. The problem comes when I use the standard LR radio aux port to listen to music from my phone while charging it. The Whining sound keeps getting louder and louder to the point that it is the only think I can hear. With the 1Amp port the effect is much less and barely audible. The socket is wired properly and the cable to the radio from the phone's mini jack is a standard male-male cable Can someone give me a hint? thanks ciao  My Land Rover doesn't have problems... it has features to keep me entertained doing DIY |
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27th Jun 2014 10:18am |
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| CyberCharlie Member Since: 01 Jul 2010 Location: Reading Posts: 140
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Thanks blackwolf. I should think of bringing a new line from the battery but i'd rather not do that as I want the socket to be under ignition key. And in regards to the radio... when I bought my Defender 2nd hand it had a beautiful Kenwood radio which I replaced for the original LR one... crazy, right?
My Land Rover doesn't have problems... it has features to keep me entertained doing DIY |
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27th Jun 2014 11:39am |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19579
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David Whittaker on here had similar issues to long ago, not sure what he did about it or the cure though if any?
I haven't had this myself but I do gave a 12v mini EL wire inverter and that makes a high pitch noise when on. I think it's just chargers that differ really. |
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27th Jun 2014 2:08pm |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2200 
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I believe this issue is caused by a ground loop issue, caused by the DC-DC 12to5v voltage conversion in the charger. 02' 110 TD5 Double Cab Rebuild Thread
84' 90 3.9 V8 Caged Pickup Build Thread - Now For Sale |
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27th Jun 2014 2:44pm |
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| CyberCharlie Member Since: 01 Jul 2010 Location: Reading Posts: 140
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thanks rallysteve,
ok it's a ground loop issue. How do I fix it? Use different grounds for radio and charger? My Land Rover doesn't have problems... it has features to keep me entertained doing DIY |
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27th Jun 2014 3:12pm |
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| K9F Member Since: 12 Nov 2009 Location: Bournemouth Posts: 9610 
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Nope.....
http://www.ebay.co.uk/itm/GROUND-LOOP-ISOL...872wt_1197  If you go through life with your head in the sand....all people will see is an ar5e!!
Treat every day as if it is your last....one day you will be right!! |
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27th Jun 2014 4:48pm |
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| CyberCharlie Member Since: 01 Jul 2010 Location: Reading Posts: 140
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Hero!!!
not sure how I use it though. Normally RCA connectors are for sound connections, right? so, does it go on the radio audio output or on the radio power supply? Or on the transformer supply? Decisions, decisions... Sorry guys while I am pretty good with screwdrivers and spanners my electrical knowledge still has plenty of space for improvement... My Land Rover doesn't have problems... it has features to keep me entertained doing DIY |
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27th Jun 2014 6:39pm |
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| Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971 
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On the input.
3.5mm mini-jack -> ground loop isolator -> head unit. I can't help feeling there must be a better way though. I wonder what would happen if the 5V supply's 0V rail was connected to the vehicle 0V. I'm confused as to why it wouldn't be actually. |
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27th Jun 2014 11:05pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19579
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What audio are you actually running, HU and front and rear speakers only?
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27th Jun 2014 11:33pm |
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| SailingTom Member Since: 19 Nov 2013 Location: ESSEX Posts: 1709
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I had a similar problem
Every morning when I drove to work there was a horrible whining coming from my radio? I never used to have this problem and never had it on any of my older cars. Anyway it was mainly between the music. Turned out an easy cure for me though as found I cant stand Nick Grimshaw on Radio 1 when he took over so I changed channel for 6.30- 10.00 and the problem was solved and the whining gone. Hope it helps for you as could be the cause Defender puma dormobile camper |
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28th Jun 2014 6:24am |
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| K9F Member Since: 12 Nov 2009 Location: Bournemouth Posts: 9610
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ST that's funny!
Cyber you wouldn't happen to have your wife, mistress, girlfriend in the vicinity when the symptoms are occuring perchance?   If you go through life with your head in the sand....all people will see is an ar5e!!
Treat every day as if it is your last....one day you will be right!! |
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28th Jun 2014 6:31am |
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