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Author Topic: Delfina is beeping in background  (Read 1227 times)

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Offline amiga4001Topic starter

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Delfina is beeping in background
« on: August 31, 2005, 08:24:57 PM »
Well the delfina is working allright actually but there is a beeping you here when the music is played.
Did try to reduce the amp settings of the other incoming signals(connected or not) like cdrom tv-card.
Still there is the beeping you here.
Could it be interference with the 2 PSU I have in the tower?
If I should pack the delfina in some kind of alu housing as much closed as possible would that help you think?
Open for ideas here.
Yes I now 1 PSU would be better but only PSU my cyberstormPPC is booting from warm and cold is the origal A4000D and the other one is for powering the drives as the desktop PSU isn't that much powerfull.
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Offline Framiga

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Re: Delfina is beeping in background
« Reply #1 on: August 31, 2005, 08:59:04 PM »
define "beeping" . . . please! :-D
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Offline amiga4001Topic starter

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Re: Delfina is beeping in background
« Reply #2 on: August 31, 2005, 09:12:34 PM »
Okay here goes,

A soft sound in the background which is of constant volumelevel.
It is the same sound like you get from a amplifier turned to max with no input signal.
It goes like: beeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeep.....
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Offline MskoDestny

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Re: Delfina is beeping in background
« Reply #3 on: August 31, 2005, 10:11:54 PM »
Is it sort of a humming noise?  If so it's probably because of the two power supplies.  You either need to find a single power supply that can handle everything or buy a ground loop isolator.
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Offline Framiga

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Re: Delfina is beeping in background
« Reply #4 on: August 31, 2005, 10:35:35 PM »
its a ground loop.

If the Delfina its the model with the rear plugs bracket separated from the card, try to remove the bracket from the tower (the ground of the rear bracket decoupled from the case one).

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Offline QuarX

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Re: Delfina is beeping in background
« Reply #5 on: August 31, 2005, 10:36:15 PM »
Hi, hello to ALL.

Yes i can appreciate this fine "PIIIIIIIII" :-(

I investigate this long time ago and i suspect for an
return of ground.

In my A4K this "beep" mute off when i disconect the two
RCA that came from the AMIGA output, for bypass and mix the
paula sound.

If ONLY delfina output is conected to the amplifier the
sound is nice clean, but the "beep" return if i connect
the round of RCA input of the delfina with some metal
surface of the A4K include the ROUND of RCA AMIGA AUDIO.

For THIS i suspect this problem is GROUND related.

Hope this help you
Very sorry for my lame english

Ciaa

Jose.  
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Offline amiga4001Topic starter

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Re: Delfina is beeping in background
« Reply #6 on: September 01, 2005, 03:21:52 PM »
Hmmm I disconnected every input from the delfina including the A4000 internal lead.
Still there is the sound in the background.
Only thing that makes it go away is to set the volumelevel in the delfinaprefs to half the volume then with nothing playing there is no backgroundsound.
But when you start a mp3 it still is hearable.
I have connected the internal connection of the delfina with a short wire to RCA plugs which are mounted in the tower.
But they resides in plastic as far as I can see so no ground touching there with the tower.
Btw it is no low noise but a very high note.
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Offline amiga4001Topic starter

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Re: Delfina is beeping in background
« Reply #7 on: September 01, 2005, 08:56:10 PM »
Well I got sick of the peeping so I installed the delfina with the buddha in an other A4000.
No luck no go I switched all electrial equipment in direct surrounding no luck.
I put a wire from the ground off the RCA jacks of the delfina to the ground off the amiga peeping got extremely worse so that is allright I gues.
Then I tried an other clockport adapter an ISDN card from individual computers and yes peeping is totally gone!!
It seems the buddha is causing some small kind of grounding from the amiga to the delfina or it is causing some kind of magnetic field interfering?

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