AM radio noise everywhere !!

grave77 · 29th March 2005, 03:26 PM

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 ?!

darkfenriz · 29th March 2005, 04:19 PM

welcome grave77

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

regards

pinkmouse · 29th March 2005, 04:28 PM

What's your schematic?

grave77 · 29th March 2005, 07:45 PM

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.

29th March 2005, 03:26 PM	#1
grave77 diyAudio Member Join Date: Sep 2004 Location: dubai	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 ?! __________________ its FAR-BEYOND-DEATH

29th March 2005, 04:28 PM	#3
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	What's your schematic? __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

29th March 2005, 07:45 PM	#4
grave77 diyAudio Member Join Date: Sep 2004 Location: dubai	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. __________________ its FAR-BEYOND-DEATH

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29th March 2005, 04:19 PM	#2
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	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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