Replacement transformer
 

Anton Gÿsen wrote:

Eeyore wrote:
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 !

Can't find anything on the B&Q site and there's nothing open at 3:20am
on a Sunday.

B&Q is NOT an electrical shop ! And what's the rush about 3:20 am on Sunday. Worried about using a few Wh
?

Find your local electrician's supply shop. And explain properly and in detail your problem. You may
actually have 'iffy' wiring because since it's the UK that *should not* happen on account of UK wiring
being probably to the best standard in the world. You probably need a proper electrical test and
certification if switching on a TV set can **** things up. Wouldn't surprise me in the USA though.

Graham

Replacement transformer
 

"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.

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

But I would rather he electrocute himself.



...... Phil

Replacement transformer
 

Anton Gÿsen wrote:

Eeyore wrote:

Inside the DAC there will be a 'regulator chip'. Or possibly it's inside the
PSU itself.

Yes I know what I regulator does...

It will make **** all difference other than deal with your entirely misplaced
preconceptions. Some of the best quality electronics comes out of China now. I
know. I've been there and seen the factories and worked with them.

There's a lot of crap that comes out of China as well. It's not as
though Cambridge Audio are making their DAC transformers in-house, they
will be buying up the cheapest crud they can lay their hands on. The PSU
looks and feels cheap.

A ridiculous assumption based on complete ignorance and prejudice.

Graham

Replacement transformer
 

Anton Gÿsen wrote:

Eeyore wrote:

And how exactly would it make the DAC sound better ? Details please ?

I don't know

Says it all !

Graham

Replacement transformer
 

Anton Gÿsen wrote:

Eeyore wrote:

Graham (pro-audio design engineer for 37 years)

Yes I've noticed from lurking on this group for a while that you like to
make your credentials known on a regular basis.

Credentials you certainly don't have.

Graham

Replacement transformer
 

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.

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

But I would rather he electrocute himself.

We all would prefer that.

Assuming that inside the DAC is a bridge rectifier, a big capacitor, and
a regulator, it should be just as happy with a DC input as with 12v AC.
Unless it uses the mains to generate its internal clock. :-)

So a 12v motorbike battery might be a good audiophool solution,
giving about 8 hours use before a recharge is required.
Or if 12v isn't enough, a stack of NiMH cells. You would need to open
the case and do some measuring to see what DC voltage is required.

--
Eiron.

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"Dave Plowman (Nutcase)"
Phil Allison

** 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?


** The asinine, ****wit OP stated he had no interest in any safety laws,
whatever.

So maybe he lives on another planet.

Lets hope he goes STRAIGHT to HELL real soon

- and meets up with YOU.




..... Phil

Replacement transformer
 

Eeyore wrote:

Adrian C wrote:

Use a PC switchmode power supply?

To make it sound REALLY crappy ?

MORON

:-P

--
Adrian C

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"Eiron"

Assuming that inside the DAC is a bridge rectifier, a big capacitor, and
a regulator, it should be just as happy with a DC input as with 12v AC.

** Very bad assumption.

The main reason makers use AC output adaptors instead of DC ones is to
generate MORE than one DC voltage rail inside the device.

Two diodes and two filter caps gives +/- 18 volts DC from 12 volts AC.

More diodes and more caps can increase the number of rails even further.

Won't work with DC - see:

http://hyperphysics.phy-astr.gsu.edu...c/voldoub.html




..... Phil

Replacement transformer
 

"Anton Gÿsen" wrote in message

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.