RFI Hum Problem. PC inducing hum in stereo

[John Leister]

OK first off my pc still works, or else I'd not be writing this
post.

But the last two days I have not been able to use my stereo
on the AM band due to a very noticeable hum in the background
on the top of one particular station on the AM band.

This occurs even when the computer is shut down but the moment
I remove the power plug from the mains the hum vanishes.

I'm thinking this is coming from the power supply inside the case.

 

[Mark Harriss]

OK first off my pc still works, or else I'd not be writing this
post.

But the last two days I have not been able to use my stereo
on the AM band due to a very noticeable hum in the background
on the top of one particular station on the AM band.

This occurs even when the computer is shut down but the moment
I remove the power plug from the mains the hum vanishes.

I'm thinking this is coming from the power supply inside the case.

Is you 'puter hooked up to your amplifier? it may be an
earth loop. Also I think ATX style power supplies are always on
even when the computer is shut down.

 

[amstereo - matt2]

your power supply is dying, dis-continue use and get a replacement - codegen
power supplies are very quiet in the RF area. $55ish

if yours is a cheaper power supply, the psu will kill the rest of the system
when it goes (ritmo/sato power supplies are notorious for this)

 

[John Leister]

your power supply is dying, dis-continue use and get a replacement - codegen
power supplies are very quiet in the RF area. $55ish

if yours is a cheaper power supply, the psu will kill the rest of the system
when it goes (ritmo/sato power supplies are notorious for this)

It's an ATX power supply

 

[Rod Speed]

OK first off my pc still works, or else I'd not be writing this post.

Bugger.

More work required on that usenet deliverable imploder.

But the last two days I have not been able to use my stereo
on the AM band due to a very noticeable hum in the background
on the top of one particular station on the AM band.

Thats just coz the stupid children 'running'
that station are having a hum-in, stupid.

This occurs even when the computer is shut down but the moment
I remove the power plug from the mains the hum vanishes.

Then you should obviously leave it unplugged, stupid.

I'm thinking this is coming from the power supply inside the case.

Yep, the power supply is still operating even with the PC
turned off, so it can see you press the power button etc.

 

[Rod Speed]

your power supply is dying,
Bullshit.

dis-continue use and get a replacement - codegen
power supplies are very quiet in the RF area. $55ish

if yours is a cheaper power supply, the psu
will kill the rest of the system when it goes

More bullshit.

(ritmo/sato power supplies are notorious for this)

More bullshit.

 

[Ken Taylor]

OK first off my pc still works, or else I'd not be writing this
post.

But the last two days I have not been able to use my stereo
on the AM band due to a very noticeable hum in the background
on the top of one particular station on the AM band.

This occurs even when the computer is shut down but the moment
I remove the power plug from the mains the hum vanishes.

I'm thinking this is coming from the power supply inside the case.

John, did you change anything at all in the last few days? cabling, position
of devices, etc??

Ken

 

[amstereo - matt2]

"But the last two days I have not been able to use my stereo
on the AM band due to a very noticeable hum in the background
on the top of one particular station on the AM band"

i.e it's just starting to occur

More bullshit.

i fix PC's for a living and i have the after effects of many sato/ritmo
power supplies failing taking the rest of the system with it (except the
floppy drive in one case)
over voltage protection on the output lines either failed or were
non-existant in these supplies, i have 10 in a stack that have 'just failed'
they all have things in common - one being an increase in interference to an
am radio (which i always have on for this very reason - that and theres
better programming on am)

More bullshit.

I doubt you can back that claim up.
i have a stack of these that failed 3 with undersides of the psu's BLACK, 4
just not running with chard areas around a zener diode and the other 3 had
other issues like tap it and the pc would reset AND THATS JUST THIS YEAR -
sounds like quality to me your full of shit your self - you say shit like 'total crap' 'absolute
bullshit' etc but you never back up ur claims - maybe it is you who be full
of da crap no?

 

[amstereo - matt2]

what brand / model is your PSU?

It's an ATX power supply

 

[Rod Speed]

"But the last two days I have not been able to use my stereo
on the AM band due to a very noticeable hum in the background
on the top of one particular station on the AM band"

i.e it's just starting to occur

Got sweet **** all to do with your stupid pig ignorant
claim that thats because the power supply is dying
and is about to kill everything powered from it.

i fix PC's for a living

You actually con people into paying you to pig ignorantly
thrash around and **** their systems quite a bit of the time.

and i have the after effects of many sato/ritmo
power supplies failing taking the rest of the system
with it (except the floppy drive in one case)

Bet thats a lie on that 'many' claim.

over voltage protection on the output lines either
failed or were non-existant in these supplies,

Another lie on that last bit.

i have 10 in a stack that have 'just failed'

Whoopy fucking do. Power supplys fail, stupid.

they all have things in common - one being
an increase in interference to an am radio

Got sweet **** all to do with your stupid pig ignorant claim that
that interference is guaranteed to be an indication that the power
supply is about to fail and take everything powered from it with it.

(which i always have on for this very reason

More fool you. You can grovel towards mecca too if
you want, proves sweet **** all about anything at all.

- that and theres better programming on am)

Pathetic, really.

I doubt you can back that claim up.

YOU made that stupid pig ignorant claim.

YOU get to back up that stupid pig ignorant claim.

THATS how it works.

i have a stack of these that failed 3 with undersides of the psu's
BLACK, 4 just not running with chard areas around a zener diode
and the other 3 had other issues like tap it and the pc would reset

Thats an entirely separate issue to your stupid pig ignorant
claim that am interference guarantees that its about to fail
catestrophically and kill everything powered from it, and
that ritmo/sato power supplys are notorious for doing that.

Anyone with a clue knows that power supplys die, fool.

AND THATS JUST THIS YEAR

Whoopy fucking do. 10 failed power supplys is sweet **** all.

- sounds like quality to me

Separate issue entirely to your stupid pig ignorant claim.

Reams of your puerile shit any 3 year old could
leave for dead flushed where it belongs, child.

 

[Mainlander]

It's an ATX power supply

ATX is not a brand

 

[Mainlander]

"But the last two days I have not been able to use my stereo
on the AM band due to a very noticeable hum in the background
on the top of one particular station on the AM band"

i.e it's just starting to occur


i fix PC's for a living and i have the after effects of many sato/ritmo
power supplies failing taking the rest of the system with it (except the
floppy drive in one case)
over voltage protection on the output lines either failed or were
non-existant in these supplies, i have 10 in a stack that have 'just failed'
they all have things in common - one being an increase in interference to an
am radio (which i always have on for this very reason - that and theres
better programming on am)


I doubt you can back that claim up.
i have a stack of these that failed 3 with undersides of the psu's BLACK, 4
just not running with chard areas around a zener diode and the other 3 had
other issues like tap it and the pc would reset AND THATS JUST THIS YEAR -
sounds like quality to me
your full of shit your self - you say shit like 'total crap' 'absolute
bullshit' etc but you never back up ur claims - maybe it is you who be full
of da crap no?

He is, he used to post the same rubbish in aus.aviation

 

[Peter Lowrie]

You have an earth problem - probably floating. Either disconnect the
sheilding/earth on the cable to the stereo so only the signal wires are
connected or place a 101 to 104 MKT capacitor in series on the earth

____________||___________ Earth sheild with capacitor
_________________________ Left sig
_________________________ Right sig

Peter Lowrie

 

[John Leister]

ATX is not a brand

I don't know the brand the case was a generic no brand
case which came with the power supply.

As a precaution I am purchasing a brand new one just to
be on the safe side.

 

[John Leister]

John, did you change anything at all in the last few days? cabling, position
of devices, etc??

No No change in card layout, wiring or anything added or removed.


I am purchasing a second brand new power supply in the hopes it
will fix the problem.

 

[amstereo - matt2]

problem with switchmode power supplies, is they are so relient on many
things in the psu circuit to be correct or else theres a risk of sending
excessive voltage down the line to the devices at the end, believe me, i
have literally seen this happen in front of me,

plug system in, turn it on zzzz zzz zzz - then there was that smell of
electronic smoke, and the PSU had failed passing huge amounts of voltages
down the lines burning holes in the chips of most of the add-on cards,
frying the cdrom, hard disk, killing the ram, cpu and motherboard. this
system had ONLY the floppy drive still OK. - the over voltage protection
section of the power supply had either failed or didn't exist, this was a
sato/ritmo power supply.

no other systems in the shop experienced any problem at the time this
happened, no light dimming etc.

I found alot of near dead power supplies would cause interference with the
radio (which i always have on AM for this reason) in a different way to what
i normally experience, like the interference would warble in frequency beat
or pulse, and would sound un-controlled.

dunno bout you, but i loose trust in things when there protection messures
don't function.

the ones i use at the shop either fail upon turn on (one has done this) or
keep working for a long time, and the best bit is the 3 year warranty from
the supplyer.

 

[John Leister]

Well I did say I am buying a new one to replace the existing one.

What more can you do besides that?

 

[Rod Speed]

I don't know the brand the case was a generic
no brand case which came with the power supply.

There may be a brand on the power supply box itself.

You may need to take the power supply
out of the case to be able to see the label.

As a precaution I am purchasing a brand
new one just to be on the safe side.

He's got his head completely up his arse on that.

 

[Rod Speed]

problem with switchmode power supplies, is they are so relient
on many things in the psu circuit to be correct or else theres a risk
of sending excessive voltage down the line to the devices at the end,

Mindless pig ignorant bullshit. A properly designed power
supply has a completely separate mechanism to shut down
the supply on overvoltage on any of the rails due to failure.

believe me, i have literally seen this happen in front of me, plug
system in, turn it on zzzz zzz zzz - then there was that smell of
electronic smoke, and the PSU had failed passing huge amounts
of voltages down the lines burning holes in the chips of most of
the add-on cards, frying the cdrom, hard disk, killing the ram, cpu
and motherboard. this system had ONLY the floppy drive still OK.

Separate issue entirely to your stupid pig ignorant claim that JUST AM
INTERFERENCE ON A PARTICULAR RADIO STATION INDICATES
THAT THE POWER SUPPLY IS ABOUT TO DIE LIKE THAT.

- the over voltage protection section of the
power supply had either failed or didn't exist,

And you're so pig ignorant that you cant even
work out if the over voltage protection is there
in that supply, or whether it didnt work properly.

this was a sato/ritmo power supply.

Proves sweet **** all about anything at all. That result
was also seen with some of the Macase power supplys.
You're presumably so pig ignorant that you dont even
recognise the brand, but it once had the same
reputation that antech does currently.

no other systems in the shop experienced any problem
at the time this happened, no light dimming etc.

I found alot of near dead power supplies
would cause interference with the radio

You can certainly see a problem with a supply
thats arcing internally like that, BUT IT DOES NOT
INTERFERE WITH JUST ONE AM RADIO STATION.

(which i always have on AM for this reason) in a different way
to what i normally experience, like the interference would warble
in frequency beat or pulse, and would sound un-controlled.

Most likely the chopper freq is varying.

dunno bout you, but i loose trust in things
when there protection messures don't function.

Better get used to that, child. Its a fact of life.

Even someone as stupid as you must have
noticed the situation where a fuse doesnt save
what its fusing, particularly with a mains surge.

the ones i use at the shop either fail upon turn on
(one has done this) or keep working for a long time,

Just like with the absolute vast bulk of power supplys, stupid.

and the best bit is the 3 year warranty from the supplyer.

Pointless with the failure rate so low.

 

[amstereo - matt2]

Mindless pig ignorant bullshit. A properly designed power
supply has a completely separate mechanism to shut down
the supply on overvoltage on any of the rails due to failure.

OH DER - sould i underline 'properly built'?

Separate issue entirely to your stupid pig ignorant claim that JUST AM
INTERFERENCE ON A PARTICULAR RADIO STATION INDICATES
THAT THE POWER SUPPLY IS ABOUT TO DIE LIKE THAT.

OH DER - never said JUST ONE STATION >

And you're so pig ignorant that you cant even
work out if the over voltage protection is there
in that supply, or whether it didnt work properly. WHATEVER - Suck me


Proves sweet **** all about anything at all. That result
was also seen with some of the Macase power supplys.
You're presumably so pig ignorant that you dont even
recognise the brand, but it once had the same
reputation that antech does currently.

SOME? SOME? you forget i mentioned SATO/RITMO?

You can certainly see a problem with a supply
thats arcing internally like that, BUT IT DOES NOT
INTERFERE WITH JUST ONE AM RADIO STATION. OH DER - Never said it did


Most likely the chopper freq is varying. OH DER - thats a bad thing

Better get used to that, child. Its a fact of life.

WITH Ass fuckers like you around, no thanks

Even someone as stupid as you must have
noticed the situation where a fuse doesnt save
what its fusing, particularly with a mains surge.


Just like with the absolute vast bulk of power supplys, stupid.

OH DER - Except the cheap made ones that fall out of specification

Pointless with the failure rate so low.

SATOs Failure rate is HIGH