"Dave Plowman (News)" wrote:

You are familiar with the regs in every country, are you?

Most countries use IEC regs.
http://en.wikipedia.org/wiki/Interna...cal_Commission

Except in N America (UL CSA), where they are effectively being forced to change
their rules to comply with IEC or face being shut out of world trade.

http://en.wikipedia.org/wiki/Ce_mark
http://en.wikipedia.org/wiki/Ccc_mark
The OZ (probably also used in NZ) C-tick Mark hasn't yet made Wikipedia properly

http://en.wikipedia.org/wiki/Power_s...uter)#External

Common certification marks for safety are the UL mark, GS mark, TÜV, NEMKO,
SEMKO, DEMKO, FIMKO, CCC, CSA, VDE, GOST R and BSMI. Common certificate marks
for EMI/RFI are the CE mark, FCC and C-tick. The CE mark is required for power
supplies sold in Europe and India.

Needs editing since not entirely accurate.

Graham

Phil Allison wrote:

"Eeysore"
Anton Gÿsen wrote:

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.

** Might just be the humongous in-rush surge drawn by the TV's SMPS
plus the CRT tube's de-gaussing coil both coming on *together* that is
" glitching " the PSU to the OP's wanky DAC.

What's the chance the TV's inrush current liniter (if fitted) is bust ?
What's the origin of the TV set one wonders. Is it CE marked ?


A chunky, 15 volt AC adaptor could be the answer ......

But I would rather he electrocute himself.

Me too !

Graham

Eiron wrote:

Unless it uses the mains to generate its internal clock. :-)

Bwahahahahahahhaha.

You should see Russ Andrew's latest audiophoolery.
http://www.russandrews.com/product.a...KGZVWENQLOEIVL

We've been working for some time with another company to develop a product
specifically for improving the performance of your Hi-Fi or Home Cinema - in
a completely different way to our existing mains filters and surge
protectors.

The designers initially approached us with a device that incorporates
technology they'd developed that they claim reduces noise in electronic
signals. Find out more about their Coherence Technology here.

When we first tested the unit, we were blown away by the clearer sound and
video and we worked with the manufacturers to improve the device to give the
best performance.

The device isn't really a mains conditioner; the technology is pretty complex
but we believe it works to enhance the actual audio and video signals to
improve your listening and viewing experience.

We call the device Clarity Pro - a name that we think perfectly sums up the
effect of the device when used in your Hi-Fi or Home Cinema system.


About Coherence Technology


To gain an understanding of what the ClarityMains and the ClarityPro devices
are and what they do, we spoke to the manufacturers to explain Coherence
Technology™. This is what they told us:

"Traditionally, there are three ways to improve an electronic circuit. You
can improve the design, you can improve the materials and you can improve the
ambient conditions in which the circuit operates. We believe that our
Coherence Technology offers a fourth way of improving an electrical circuit.

"Coherence Technology neutralises noise inherent in circuits... noise that is
caused by discrepancies of time and amplitude in the ground plane. By
increasing the underlying coherence of the ground plane, the technology
neutralises this noise. When we neutralise this inaudible noise there are
improvements in the performance qualities of the audio signals. and there is
also an improvement in the listener's ability to appreciate and gain greater
entertainment value out of the sound reproduction."

That's their explanation; the real proof of the effectiveness of the units
are in their performance. Try them and you won't be disappointed!

" When we neutralise this inaudible noise " CLASSIC !


Graham

Adrian C wrote:

Eeyore wrote:

Adrian C wrote:

Use a PC switchmode power supply?

To make it sound REALLY crappy ?

MORON

:-P

Do you know what Y Caps are and where they're used ?

Not to mention HF noise on PC PSU outputs that'll whistle through a
standard regulator.

Graham

"Eeyore" wrote in message
...



Common certification marks for safety are the UL mark, GS mark, TÜV,
NEMKO,
SEMKO, DEMKO, FIMKO, CCC, CSA, VDE, GOST R and BSMI. Common certificate
marks
for EMI/RFI are the CE mark, FCC and C-tick. The CE mark is required for
power
supplies sold in Europe and India.


But bringing this back to the original point, the operative word above is
"sold". If you put a transformer in a box for your own use you don't need
"type approval" (though if it's dangerous and somebody dies as a result you
might find yourself up on a charge of manslaughter).

David.

Arny Krueger wrote:

"Anton Gÿsen" wrote
Anton Gÿsen wrote:

The power input on the DAC requires 1.5 amps AC.

Forgot to mention, it's 12 volts.

Designing power supplies is a cookbook process.

The transformer you linked to is vast overkill, but also inadequate. You
don't need a 6 amp transformer for a DAC. Even 1.0 amp might be overkill.

If you want to build a power supply that puts out 12 volts, you will
probably need a power transformer that puts out more than 12 volts. The
extra voltage will be taken up by losses, particularly in the regulator.

Also, you want some allowance for situations where the power line's voltage
is lower than spec.

It is common to build regulated power supplies for 120 volts that work well
when the power line is 90 or 100 volts. For example a power transformer for
a power supply that puts out 12 volts might be based on a 16 or 18 volt
transformer. The voltage regulator will take up the slack most of the
time.

He's in the UK though.

It's mostly 240-252V here. Despite the EU. The Chinese don't understand this and
design for 230V, so if anything he should be getting more volts out than he
needs (i.e more 'headroom'), plus the core will be closer to saturation, so it
will get warm.

Graham

Adrian C wrote:

Arny Krueger wrote:

It is common to build regulated power supplies for 120 volts that work well
when the power line is 90 or 100 volts. For example a power transformer for
a power supply that puts out 12 volts might be based on a 16 or 18 volt
transformer. The voltage regulator will take up the slack most of the
time.

When modders get in and change the internal circuitry about, say trying
upgraded opamps, then the power supply is the next natural target for
the upgrade.

You mean downgrade of course !


The following document, for my dac-in-the-box is one approach of said
improvements (I've not tried this - I'm happy as the item is) where the
proposer has also had to upgrade the voltage regulators and then find a
better PSU. And suffer more regulator heat dissipation.

http://www.audioasylum.com/images/DITBMOD.pdf

They don't call it AUDIOASYLUM for nothing. I hope your straitjacket is a good
fit.

MORON !

Graham

Adrian C wrote:

Anton Gÿsen wrote:

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.

I've got a Pioneer 'audio digital timer' in my Hifi stack.

Jolly good for you. You could use a clockwork one too.

MORON !

Graham

"Dave Plowman (News)" wrote:

Quite the reverse. But I doubt you know all the wiring regs in your own
country - let alone others.

They are all almost universally IEC 60065 now.

Graham

Serge Auckland wrote:

"Anton Gÿsen" wrote in message
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. Would you kindly show me where I
can get one a lot cheaper than that?

http://cpc.farnell.com/FT00727/compo...ts-fe-sc-ca-sw

£ 3.63 including VAT.

You just need to wire that to the plug on your DAC or to the item which
causes the glitch, or just to a plug and plug it in to the mains strip the
DAC is on or the offending item . I had the same problem with a fridge many
years ago, and one of these fixed the problem perfectly.

Illegal to fit that except INSIDE equipment by a professional. Would invalidate any house insurance.

See the 'Low Voltage Directive'.
http://ec.europa.eu/enterprise/elect...t/lv/index.htm
http://eur-lex.europa.eu/LexUriServ/...10:0019:EN:PDF
http://www.bsi-global.com/en/Product...age-Directive/

Graham