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Old 29th March 2005, 03:26 PM   #1
grave77 is offline grave77  United Arab Emirates
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Question AM radio noise everywhere !!

Hi there ... this is my first thread, I have 4 amplifiers, 2 are ICs ( TDA series ) and 1 soild state with PWM powersupply. all are delivering AM radio in the background. I tried many filters on audio input and mains. still audiable!! I think the signal is stronger than I though but I didn't measure it yet.
any suggestions ?!
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Old 29th March 2005, 04:19 PM   #2
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welcome grave77

hm...
good shielding i.e. thick chassis and everything earthed (through 10R ||100nF)
needs several kilos of metal...

regards
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Old 29th March 2005, 04:28 PM   #3
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What's your schematic?
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Old 29th March 2005, 07:45 PM   #4
grave77 is offline grave77  United Arab Emirates
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you can take it as simple as this, I have a car amplifier that's connected to a 20A power supply. sure the amplifier has a PWM power supply inside with all the RF filters installed. still it's amplifying some AM noise even with no inputs at the RCA in.
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