Could be anything, some signals routed under or near the left chip.. bad grounding on the left one.. probably just layout of the pcb, either tracks or physical location..Paulo P wrote: ↑Tue Apr 24, 2018 8:04 pm No, I didn't run memory test software yet... but I have this feeling that the more RAM access, the worse noise is in the audio out. No matter if it is a direct stereo output or monitor audio (pin 1).
So, the question is why and if there is a possibility to defuse this noise and interferences.
And why only in left channel?
Hissing and whistling in the STe audio output
Re: Hissing and whistling in the STe audio output
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: Hissing and whistling in the STe audio output
I understand. So, if you would have time sometime, please record your machine(s) to find out if all machines are the same and the hissing appears there too.exxos wrote: ↑Tue Apr 24, 2018 8:13 pmCould be anything, some signals routed under or near the left chip.. bad grounding on the left one.. probably just layout of the pcb, either tracks or physical location..Paulo P wrote: ↑Tue Apr 24, 2018 8:04 pm No, I didn't run memory test software yet... but I have this feeling that the more RAM access, the worse noise is in the audio out. No matter if it is a direct stereo output or monitor audio (pin 1).
So, the question is why and if there is a possibility to defuse this noise and interferences.
And why only in left channel?
Re: Hissing and whistling in the STe audio output
I will try and do that later this week...
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: Hissing and whistling in the STe audio output
OK, I hooked up my STE to my PC.. I hear the sounds I think.. but this is PC noise...
Can't seem to record it in audacity... but when I run graphics test, sound goes mental.. I always disable the line input jacks on my sound card because I always hear loads of noises... makes no odds if the STE is plugged in or not..
think it would need a really good quality sound recording device which has low noise ot start with, I don't think PC's are up to it (at least not mine anyway)
Can't seem to record it in audacity... but when I run graphics test, sound goes mental.. I always disable the line input jacks on my sound card because I always hear loads of noises... makes no odds if the STE is plugged in or not..
think it would need a really good quality sound recording device which has low noise ot start with, I don't think PC's are up to it (at least not mine anyway)
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: Hissing and whistling in the STe audio output
OK finally got it recorded..
This is pure PC noise... after 10 seconds I start graphics tests...
This is pure PC noise... after 10 seconds I start graphics tests...
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
- stephen_usher
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Re: Hissing and whistling in the STe audio output
If it's any help as a reference, the TT's audio output (twin phono) is a great bus monitor. You can hear all the memory accesses as a twerping "hiss" and it's amplified by the internal pre-amp as if you turn the sound volume down in the control panel the "hiss" decreases also.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
Re: Hissing and whistling in the STe audio output
I have heard noise on my STE's, but I only used headphones direct. Pressing spacebar pretty much deafened me it was that loud. so any noise I should hear it easily. I did hear a tiny bit, more so on RAM access, but my dac fix solved it, but I could barely hear it to start with.
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: Hissing and whistling in the STe audio output
So, the same situation on TT too?stephen_usher wrote: ↑Tue Apr 24, 2018 9:36 pm If it's any help as a reference, the TT's audio output (twin phono) is a great bus monitor. You can hear all the memory accesses as a twerping "hiss" and it's amplified by the internal pre-amp as if you turn the sound volume down in the control panel the "hiss" decreases also.
Re: Hissing and whistling in the STe audio output
Did a new sample..
PC only (STE turned off)
STE Turn on.
Samples..
On the STE one, I do hear (and you can hear in the audio) when it starts doing memory test, you can hear the "dashes" on the screen as the come up..
I need to find me headphone adapter and try that again...
PC only (STE turned off)
STE Turn on.
Samples..
On the STE one, I do hear (and you can hear in the audio) when it starts doing memory test, you can hear the "dashes" on the screen as the come up..
I need to find me headphone adapter and try that again...
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.