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Class D Switching Power Amplifiers and Power D/A conversion

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Old 9th December 2012, 11:24 AM   #1
pdul is offline pdul  Denmark
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Default 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?
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Old 9th December 2012, 11:31 AM   #2
MiiB is offline MiiB  Denmark
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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...
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Old 9th December 2012, 11:50 AM   #3
pdul is offline pdul  Denmark
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Sounds about right, but why now? After years of problemfree use?
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Old 9th December 2012, 09:20 PM   #4
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Location: Carlisle, England
Originally Posted by pdul View Post
Sounds about right, but why now? After years of problemfree use?
Maybe one of the output filter components has failed ?
Murton-Pike Systems PCBCAD51 pcb design software.
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