LC AUDIO class D

pdul · 9th December 2012, 11:24 AM

I have a 2*200w LC AUDIO class D poweramp. About a year ago i tokk it out of my setup and renewed the electrolytics in the psu (one of them were bulgin), i put it back in my setup, and everything was working as it should.
About a month ago my fm tuner startet to freak out, distorted sound and a lot of background hiss, then i tried another tuner, and same problem, so my first thought was that there was something wrong with my rf signal, so for some time i stopped listening to radio.
Then yesterday, i tried to connect my old NAD218THX, and to my big surprise the radio started to behave normal

During the whole time the CD and the recordplayer havent behaved abnormally.
The Class d powerstage is influencing the radio, what can be wrong?

MiiB · 9th December 2012, 11:31 AM

RF generated from switching...This was one of the main obstacles when Class D was born, the steep switching flanks creates high frequency content that disturbs your turner.
When I tried the LC-audio modules some years back, they blocked my TV...

pdul · 9th December 2012, 11:50 AM

Sounds about right, but why now? After years of problemfree use?

nigelwright7557 · 9th December 2012, 09:20 PM

Quote:

Originally Posted by pdul

Sounds about right, but why now? After years of problemfree use?

Maybe one of the output filter components has failed ?

9th December 2012, 11:24 AM	#1
pdul diyAudio Member Join Date: Jan 2009 Location: Copenhagen	LC AUDIO class D I have a 2*200w LC AUDIO class D poweramp. About a year ago i tokk it out of my setup and renewed the electrolytics in the psu (one of them were bulgin), i put it back in my setup, and everything was working as it should. About a month ago my fm tuner startet to freak out, distorted sound and a lot of background hiss, then i tried another tuner, and same problem, so my first thought was that there was something wrong with my rf signal, so for some time i stopped listening to radio. Then yesterday, i tried to connect my old NAD218THX, and to my big surprise the radio started to behave normal During the whole time the CD and the recordplayer havent behaved abnormally. The Class d powerstage is influencing the radio, what can be wrong?

9th December 2012, 11:31 AM	#2
MiiB diyAudio Member Join Date: May 2005 Location: Denmark	RF generated from switching...This was one of the main obstacles when Class D was born, the steep switching flanks creates high frequency content that disturbs your turner. When I tried the LC-audio modules some years back, they blocked my TV... __________________ http://www.linkedin.com/pub/michael-...esen/a/a55/544 http://www.raidho.dk/

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9th December 2012, 11:50 AM	#3
pdul diyAudio Member Join Date: Jan 2009 Location: Copenhagen	Sounds about right, but why now? After years of problemfree use?