David Looser wrote:

If you can afford a new transformer, you can afford a filter!

In spades.

Graham

Anton Gÿsen wrote:

Serge Auckland wrote:

A mains filter will cost a few pounds/euros. You're not thinking of an
audiophile one are you? That's a £€5 part in a £€ 50 box with a £€ 1000
price tag.

I can only find the audiophile ones.

You mean audiophool.

Try an electrical shop ! They're probably better made anyway !

Graham

Anton Gÿsen wrote:

Yes but it consumes electricity when it is doing nothing useful
whatsoever.

So does your body consume energy. Considered fitting an on/off switch on yourself
?

And chuck out that CRT TV and get an LCD one. You can probably do that for the
price of saving 1W on your precious DAC's PSU.

Graham

Anton Gÿsen wrote:

OK, but I'm still not happy

You seem that kind of person.

Graham

In article , Eeyore
wrote:


Serge Auckland wrote:

If you want to add an on-off switch, then why not make a small mains
extension, and put a torpedo switch near the socket

I think 'torpedo' switches are now illegal...

That seems unlikely. I bought one a few weeks ago, and IIRC the CRC leaflet
I just got advertises them.

Slainte,

Jim

--
Change 'noise' to 'jcgl' if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

In article , Anton Gÿsen
wrote:
Eeyore wrote:

Anton Gÿsen wrote:

The on/off switch is my main complaint, but I can't help feeling like
the power supply was done by Cambridge Audio on the cheap. For
instance, sometimes the sound drops out for a fraction of a second
when I switch my CRT TV on. I refuse to believe that the design of
this PSU cannot be improved upon.

Most likely a problem with your ***TV*** !

My TV has nothing to do with my DAC.

It would appear to be the source of the interference you reported as
causing breaks in the performance of the DAC. The normal rule is to deal
with interference *at source* if you can do so.

And why are you using a CRT TV using lots of watts when the most you
can save by changing the PSU on this DAC is 1-2W ?

I don't watch much TV. I do however, listen to lots of music via my DAC.

Change the bloody TV you NITWIT if 'being green' is what it's about.
Get an LCD one.

I will one day, but for the moment I'll stick to my 14" CRT, it only
consumes 44 watts.

Which means it will eat as much energy in 1 hour as your idle CA PSU does
in about 18.

Whatever PSU you make or buy will consume some power when running. If you
want zero power consumption when not using the DAC, then do as various
people have suggested. Either pull the plug, or fit a switch.

If you are unable to stop the interference at source, then add a mains
filter to the PSU. (Although there is no guarantee this will solve the
problem as the interference might not be conveyed into the DAC via its
power leads.)

Look at the on-line catalogues for CPC, Maplin, RS, etc, for things like
switches and filters.

Since you have a 'wall wart' you could fit a shunt RF capacitor and some
ferrite beads to the lead from wall wart to the DAC. This would be cheaper
than buying an enclosed filter block, but requires you to be able to
solder, etc. You'd also need to know enough to choose suitable components.

Since you have a wall wart, the easiest way to fit a switch would be to buy
a switched mains distribution board and plug it into that. If you buy a
filtered/surge-suppressed one, that may deal with the other problem.

Slainte,

Jim

--
Change 'noise' to 'jcgl' if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

In article ,
Phil Allison wrote:
I am wishing to build a replacement transformer for my Cambridge Audio
DacMagic DAC (the new one that's just come out). I am unhappy with the
original PSU because it is inefficient and doesn't have a physical
on/off switch so it's constantly drawing a current unless you unplug it,
and I like to save evergy where I can.


** You cannot legally build your own AC "plug pack" - such items
require specially design transformers and must be made and ** agency
approved ** to meet the Class 2 safety standard.

You are familiar with the regs in every country, are you? Or just spouting
your usual negative bile?

--
*A dog's not just for Christmas, it's alright on a Friday night too*

Dave Plowman London SW
To e-mail, change noise into sound.

Anton Gÿsen wrote:

Eeyore wrote:
Anton Gÿsen wrote:

The on/off switch is my main complaint, but I can't help feeling like
the power supply was done by Cambridge Audio on the cheap. For instance,
sometimes the sound drops out for a fraction of a second when I switch
my CRT TV on. I refuse to believe that the design of this PSU cannot be
improved upon.

Most likely a problem with your ***TV*** !

My TV has nothing to do with my DAC.

Yes it does. They share the same AC mains supply.

Graham

Anton Gÿsen wrote:

Phil Allison wrote:

Wanna bet he drives a real petrol guzzler.

I don't drive.

Probably a good thing !

Graham

Anton Gÿsen wrote:

Eeyore wrote:

So does your body consume energy. Considered fitting an on/off switch on yourself
?

What kind of question is that?

More meaninful than yours. Do you know how much energy the body uses on 'standy' ?
Around 100W.

Graham