Murata regs + Caiman = Problem??

[Gazjam]

Odd thing happened tonight....

Was listening to some classical music, quiet stuff just chilling out.
Crap, whassat?
I heard a background noise not dissimilar to what I heard with the Murata's but a lot quieter.

Putting my ear up to the speaker there it was, like before it only kicked in when music was playing.
Thinking it was my Dac (aww what now?!!) I switched everything off and back on, made sure all cables were in tight and sat back down.
Noise still there, but as time went on I noticed the "tone" of it changed when I was going through the SB Touch's menus...weird.

Unplugged the Touch and the noise was gone.
Almost like I could hear the noise the Touch was putting back in to the system?
Its the original PSU and I'm thinking as the Dacs far more transparent now with the Dexa's I'm now hearing the crap the switcher on the Touch is leaking out?
Possible you think?

So I'm thinking about changing the PSU on the Touch, any suggestions for a linear supply...?

*EDIT*
The problem being mains related I thought about maybe trying a filter, so I managed to track down a Belkin PF30 for £42 online and ordered one of those.
(Pretty good writup on here and elsewhere from folks with a high bullshit radar, so worth a punt. I figure if it doesnt help in my system I can pass it on in the classifieds)

So..linear supply for the Touch...hmnnn.
Cant afford foo really unless its justified though.

Thanks.

[MartinT]

It does sound like it's the Touch PSU. Is it a switching wall-wart?

[Canetoad]

I've just dug out the Toslink socket I have. It's THIS one from Farnell. I'm in the progress of modifying my regulator heatsinks a little more so I'll hopefully install the Toslink socket tomorrow when I build the DAC back up. I'll let you know how I get on.

Thanks Dave. I'll take a look at these. Let me know when you get it installed.

[Canetoad]

Gaz,

I'm currently using a Maplins adjustable PSU on my Touch till I can get a dedicated linear supply for it. Part number is L11BQ. It's on special at the moment for £19.99. I paid about £30 for mine.

Might be a good stop-gap till you get something better.

[HighFidelityGuy]

Thanks Dave. I'll take a look at these. Let me know when you get it installed.

Well I fitted one of the Toslink connectors I got from Farnell and it doesn't work properly. I just get clicks and pops. So I wouldn't recommend trying that one. I'm not sure if it's the connector that's the wrong type or whether something else needs modifying to make that input work with a Toslink socket.

[StanleyB]

It should have worked right away. I'll have a think about the symptoms.

[HighFidelityGuy]

Thanks Stan! Much appreciated.

I don't think I've done any mods which could have knackered that input. I'm sure I tested the USB input when I first got the DAC and then I removed it about a year ago as I didn't need it and it was getting in the way when doing mods. The other optical input works fine.

[Gazjam]

It does sound like it's the Touch PSU. Is it a switching wall-wart?

Thanks Martin.

The Touch psu is a switching supply, not had any probs with it before though and its supposed to be a lot more electrically "clean" than the previous SB3 one.
Theres no other switching supplies in my system and I'm targeting this as I can hear the noise change when I adjust the menu's on the Touch.
The only thing thats changes really is getting the Dexa's fitted to the Dac.

Maybe its the supply itself?
I think I have a similar rated switching supply in my box o' bits, I'll troubleshoot by swapping that in that and see if it changes things.

[Gazjam]

Gaz,

I'm currently using a Maplins adjustable PSU on my Touch till I can get a dedicated linear supply for it. Part number is L11BQ. It's on special at the moment for £19.99. I paid about £30 for mine.

Might be a good stop-gap till you get something better.

I have one of those Bernie
Used it in my old 7510 dac, need to dig it out.

Its a switching supply I think though, but I'll try that along with the other suitable psu I have, just to check if its my Touch supply thats causing the noise.

[slate]

Theres no other switching supplies in my system and I'm targeting this as I can hear the noise change when I adjust the menu's on the Touch.

Are you running optical between your Touch and your Dac?
I am just pondering about how the noise travels... piggybacking on the music, cables or via the mains... well you did state that you only hear it when music is playing