[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2007-01-02 Thread boxercup

I purchased a 5V 1A linear power supply to evaluate the difference
between stock and upgraded ps on my SB3. I popped open the stock ps and
it seems to be quite well built. The aftermarket ps has a less involved
circuitry but a considerably larger transformer.

I am very familiar with the performance of my SB3 and in my system the
internal dac of the SB3 is superior to the dac in my receiver. I also
use the internal dac on my cd player for my comparison as it performs
better as well. 

The driving force behind the upgrade was a definite lack of detail and
depth on the SB3 playing Apple Lossless Compression music compared to
my cd player.

The SB3's performance has improved to the point that the difference is
far less apparent. Detail and depth are improved and most of the
difference in the presence is due to the output level of the SB3 being
down slightly.

I am eager to try an outboard dac to see if I can exploit the SB3's
performance even more.

System
cd- Denon dvd-2800 mkII
rcvr- Pioneer Elite vsx-53tx (as preamp)
amp- (2)Hafler 220
spk- Vandy 2c


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2007-01-02 Thread NewBuyer

boxercup;166630 Wrote: 
 I purchased a 5V 1A linear power supply to evaluate the difference
 between stock and upgraded ps on my SB3...most of the difference in the
 presence is due to the output level of the SB3 being down slightly...

At 1A, do you think that may be a bit low for the SB? Is it getting
really hot when in use?

Also, I believe you saying, that the new PS has caused the output of
your SB to be less loud than with the stock PS. If so, I wonder if this
implies you might be overtaxing your new PS. I wonder if doing so, could
ever produce distortion (?)


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-23 Thread tyler_durden

I don't know how many of you folks are aware of it, but not all linear
regulators are created equal.  An ideal regulated power supply should
look to the load like an ideal voltage source.  That means it should
supply any amount of current required to maintain the constant voltage,
regardless of what the load is doing or how fast it is doing it.  The
impedance of the supply should look like 0 Ohms over an infinite
bandwidth.

In the real world, the impedance should be very low over at least the
audio bandwidth.  If you really want to know if a linear supply
matters, build one with a Jung super regulator.  It is about as close
to ideal as you're going to get.  Check google for the circuit.  

I believe the transporter uses Jung regulators to power the audio
circuits.

I_F


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-23 Thread Skunk

tyler_durden;164500 Wrote: 
 The cable length matters.  Wire is inductance and resistance... As with
 speaker cables and interconnects, however, the 2 or 3 feet used to
 connect to your SB3 won't have any practical effect.  

Thanks for the clarification. I would prefer to have the regs in the
same box as the load, but of course that means reboxing. The standard
recommendation seems to be keep the cable really short, but maybe
that's for noise rather than impedance. 

I don't expect it to turn my Sb3 into a Transporter, the on-board
implementation in Transporter is sure to be far quieter (in fact I
think Sean may have measured an Sb3 with off-board superregs but I
don't remember the results). It does seem like the most logical first
step in modding though.


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-23 Thread seanadams

Skunk;164487 Wrote: 
 Wouldn't you need 3, one externally and one each for 5v and 9v analog,
 to _really_ see if a linear supply matters? At any rate I wish I had
 your ability to build from schematics.

A single super regulator will get you most of the way there. The DAC's
5V rail is the most important - after that the returns diminish
quickly. The 9V op-amp stage is far less sensitive to PS noise than the
DAC.


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-22 Thread shlea

Can anyone please explain why a linear PS should give better sound?

What is the technical difference?

Is the difference in sound quality significant even for a SqBox 3 with
up to 192 bits MP3 files?

Thanks.

Svein-Helge


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-22 Thread Phil Leigh

shlea;164196 Wrote: 
 Can anyone please explain why a linear PS should give better sound?
 
 What is the technical difference?
 
 Is the difference in sound quality significant even for a SqBox 3 with
 up to 192 bits MP3 files?
 
 Thanks.
 
 Svein-Helge
Opinions vary. It is possible to make excellent switching supplies - at
a cost. Linn for example.
The most popular theory - that I agree with as well - is that switching
supplies create RF interference that can upset other parts of the system
(eg amps, DACs) that are not as well engineered as they might be.

Certainly the stock unit (UK model) produces lots of RF - you can't use
one near an AM radio for example. If the RF gets onto the SPDIF signal
it may make the signal harder for an external DAC to handle accurately.


For those using the analogue outputs, obviously the quality of the
supply is fundmental to the quality of the output stage of the internal
DAC.

Whether you will hear the difference on 192Kbs MP3's I don't know - I
don't have any. I'm sure someone will know...


Regards
Phil


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-22 Thread ddddddden

Skunk;163990 Wrote: 
 There's not much point in using a 3 amp supply with the Radioshack type
 N, because it's only rated for 1 amp. Thanks Richidoo, for raising this
 point in another thread.

Got a link for that thread?

By all means, use a Switchcraft plug if you have them available at the
corner store or want to order one for $10 delivered. 
That's why I provided the links.  ;)  

The RatShack plug is not exactly beefy, but I would be 'shocked' :) if
the relatively short connection would not conduct more than 1A in short
bursts without melting. . .which would be the reason for using an
oversize 3A PS -- to have current available for brief dynamic peaks
without stressing the PS.  

The rating of the RatShack connector is probably for a steady draw of
1A all day.  The SB usually draws  1A, even less with the display
turned off, which is how I run it.  I would look at the 1A rating of
the connector in this steady-state context.  I would be extremely
surprised to learn that delivering bursts of, say, 2A is a problem with
this connector.  

Squeezebox Power Requirements
http://www.audiocircle.com/circles/viewtopic.php?p=219713highlight=#219713


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-22 Thread Phil Leigh

aybee;164252 Wrote: 
 Yup 'my' CPC units are both Stontronics, both ran hot and the first one
 (which lasted the longest don't forget) gave off a smell at first. 
 Having read that old thread I may break one open just to see what is
 inside.
 
 Alan


Alan - v interesting - if you do break one open I'd love to know what
is (or isn't!) in there...

mine is  a model AD-0501500RBS...I've just checked and its not hot -
slightly warm you can hold it in your hand with no discomfort - I'd say
it's about 25 degrees C.


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-22 Thread Phil Leigh

...and I've just smelt it (having read your post again). It seems OK.

I'm guessing there's not much more than a x-former, caps, a reg, diodes
and a one-shot thermal fuse in there...

According to the manufacturers, these things are designed to be used in
schools and similar places - so you'd expect them to be OK for what
they are - ie cheap!.


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-22 Thread tyler_durden

shlea;164196 Wrote: 
 Can anyone please explain why a linear PS should give better sound?
 Svein-Helge

Some people think they hear a difference when using a linear regulated
supply.  

Others, such as myself, perceive no difference.  

The audio circuits inside the SB3 are powered from a DC-DC converter
inside the SB3.  A DC-DC converter is a type of switching power supply.
Even if you use a linear supply external to the SB3, the internal
switching supply remains.

There have been numerous threads on this subject, and Slim Devices
people even made a bunch of measurements that actually looked
microscopically better with the stock switching supply.

In short, if you WANT to hear a difference, you probably will, and if
you don't really care, you probably won't.  If you're listening to mp3
files, you probably don't care enough to hear a difference anyway.

TD


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-22 Thread Skunk

ddden;164222 Wrote: 
 Got a link for that thread?

No, but a search for 'power supply' should do the trick.

 The RatShack plug is not exactly beefy, but I would be 'shocked' :) if
 the relatively short connection would not conduct more than 1A in short
 bursts without melting. . .which would be the reason for using an
 oversize 3A PS -- to have current available for brief dynamic peaks
 without stressing the PS.

You are probably right. Not trying to change the discussion but IMHO,
if you really want tight regulation you should use the provided S+ and
S- terminals, and 4 wires will be pretty hard to get onto the type 'n'.
The attached photo does a pretty good job of making this clear. On the
left is the type 'n'. The photo doesn't do a very good job of showing
how truly flimsy the center pin connector is, and it's even on there
crooked. In the middle is a 'Philmore' 5.5x2.5ID which was a dollar
fifty, as well as the switchcraft on the right which was seventy five
cents (local surplus). New switchcrafts are actually less than five
dollars, and well worth the hassle of ordering/waiting- again IMHO.


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-22 Thread ddddddden

Thanks for the pic.  :)

Yes, the RatShack connector is a flimsy POS.  I believe those were my
exact words as I struggled to attach the wires to it without breaking
the tabs. 
The Switchcraft(part no. 760?)is less than $5. . .$3.08, but Digikey
has a $5 handling fee on orders less than $25, so you're probably
looking at $10 with  shipping.  You could put together a $25 order to
save the $5 handling fee and distribute the shipping cost among several
items, but that's a different project.  The RatShack was there.  I
bought it.  It works.  The next time I have a large order of parts, I
will get a  Switchcraft connector too.  

Are the S+ and S- terminals a feature of the specific PS you are using?


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-21 Thread ddddddden

http://www.slimdevices.com/pi_squeezebox.html
Power input
* 5.0V DC, regulated
* Center positive, sleeve ground
* Connector: 2.5mm ID, 5.5mm OD, 11mm long
* Min supply rating: 1000mA 

Switchcraft makes some DC plugs.
http://www.switchcraft.com/products/jack-146.html
http://dkc3.digikey.com/PDF/T063/0337.pdf

but I used one of these:
http://www.radioshack.com/product/index.jsp?productId=2102488cp


Yes, the linear supply does make a difference, IME.


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-21 Thread Phil Leigh

Skunk;163194 Wrote: 
 I am aware of no such beast. The cheapest plug/play would be the modded
 elpac by Bolder, and I believe one of the mods is change the DC
 connector, so the stock elpac is out. 
 
 You sound like you want to go about this by the book when stating your
 default position is there is no difference, but how will you prove
 otherwise? Sean has done some measurements, and IIRC the SB3 measured
 worse with the linear supply.

Hate to disagree but this one is PP! (and it sounds great too!)

http://cpc.farnell.com/jsp/search2/browse.jsp;jsessionid=CUEQOXQTGV4IZQFIAEXENZQ;jsessionid=CUEQOXQTGV4IZQFIAEXENZQ?Ntt=PW00187Ntk=gensearch_003N=411+59Nty=1


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-21 Thread Phil Leigh

Sorry - I keep forgetting about that!


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-21 Thread Skunk

jan van mourik;163946 Wrote: 
 That's cool, except it's quite a ways to ship it to the US... Darn...
 jan

Though it's less hassle than learning to solder, risking house fire, or
paying $175 for a tricked out wall wart :)

Good link Phil (although it went to CPC main page..)

There's not much point in using a 3 amp supply with the Radioshack type
N, because it's only rated for 1 amp. Thanks Richidoo, for raising this
point in another thread.


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-21 Thread Phil Leigh

Sorry I messed up the link...

http://cpc.farnell.com/jsp/endecaSearch/searchPage2.jsp?Ntt=PW00187Nty=1N=411Ntk=gensearch


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-21 Thread Nick77

I jumped the gun on this thinking it was wm series, will this suppy
work? Noob!

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemih=005sspagename=STRK%3AMEWA%3AITviewitem=item=150062554407rd=1rd=1


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-21 Thread Phil Leigh

You're looking for 5v at 1.5A. It needs to be 5V (no more or less) and
at least 1.5A (higher is OK as the SB will only draw what it needs!)


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-21 Thread jeffmeh

Phil Leigh;164001 Wrote: 
 Sorry I messed up the link...
 
 http://cpc.farnell.com/jsp/endecaSearch/searchPage2.jsp?Ntt=PW00187Nty=1N=411Ntk=gensearch

I'm assuming this one would not have a standard U.S. plug and expect
110V, yes?


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-21 Thread Phil Leigh

jeffmeh;164034 Wrote: 
 I'm assuming this one would not have a standard U.S. plug and expect
 110V, yes?

Er - yes. I'd have thought you could find an equivalent in the US with
US fittings/voltage.

The mains plug of course is easily changed - but really this is a UK /
European solution 220-240V - apologies!


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-21 Thread jeffmeh

Phil Leigh;164036 Wrote: 
 Er - yes. I'd have thought you could find an equivalent in the US with
 US fittings/voltage.
 
 The mains plug of course is easily changed - but really this is a UK /
 European solution 220-240V - apologies!

One would think so, but finding a suitable, reasonably priced,
plug-n-play, US model appears to be quite a challenge.


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-21 Thread tyler_durden

Nick77;164018 Wrote: 
 I jumped the gun on this thinking it was wm series, will this suppy
 work? Noob!
 
 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemih=005sspagename=STRK%3AMEWA%3AITviewitem=item=150062554407rd=1rd=1

No.  Two problems.  First, the voltage is too high.  The SB wants 5V,
not 7.5.  Second, that's a switching supply.  You already have one of
those and that is what the whole linear vs. switching power supply
thing is about.

TD


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-21 Thread aybee

Phil Leigh;164001 Wrote: 
 Sorry I messed up the link...
 
 http://cpc.farnell.com/jsp/endecaSearch/searchPage2.jsp?Ntt=PW00187Nty=1N=411Ntk=gensearch

Phil, and anyone in the Uk considering this item should note my
experience perhaps:

I purchased two of these and while they did work out of the box both
have subsequently died, the first lasted about six months and the next
one only about three months.

Alan


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-21 Thread Phil Leigh

Well...you must have been unlucky because mine's been working for about
12 months now with no problems...


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-21 Thread Skunk

I remembered a thread about power supplies failing, and I think the CPC
unit may be the infamous specimen.  

http://forums.slimdevices.com/showthread.php?t=26937


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-21 Thread Phil Leigh

Skunk;164172 Wrote: 
 I remembered a thread about power supplies failing, and I think the CPC
 unit may be the infamous specimen.  
 
 http://forums.slimdevices.com/showthread.php?t=26937

Skunk,
I'm not sure if they are the same. My CPC unit is made by a
local(ish) firm called Stontronics. It doesn't run hot as described in
the other thread. Maybe someone else who has one of these could
confirm?
Phil


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-18 Thread El Duderino

I agree completely with your statements, Greg.  Which is why I am trying
to locate a source for an inexpensive, linear, plug-and-play power
supply.  I will approach the comparison between linear vs. stock with
an open mind but I do feel that the default position has to be that
there is no difference.  This can, of course, be proven wrong, hence
the need to try it out.

El Duderino/OtoDoc


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-18 Thread Skunk

El Duderino;163190 Wrote: 
  Which is why I am trying to locate a source for an inexpensive, linear,
 plug-and-play power supply. 

I am aware of no such beast. The cheapest plug/play would be the modded
elpac by Bolder, and I believe one of the mods is change the DC
connector, so the stock elpac is out. 

You sound like you want to go about this by the book when stating your
default position is there is no difference, but how will you prove
otherwise? Sean has done some measurements, and IIRC the SB3 measured
worse with the linear supply.


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-18 Thread Deaf Cat

When changing to a linear psu did any one notice a slightly softer /
maybe not so much bite in the treble department ?

I know I need to have a bash myself, but just wondering.


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-17 Thread tomjtx

Tyler,
That is a terrific post especially since you don't think these PS's
make a difference.
It is very interesting how cheap they are.
I got my Elpac for 17.00 when everyone else was paying 40.00

Why? The electronics store I bought from didn't yet know about the
Audiofool demand for the Elpac :-)

Tom


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-17 Thread El Duderino

A quick question.  Are the 5 pin DIN connectors plug-and-play compatible
with the Squeezebox? I am referring to the power supply referenced in
Tyler's second link.  I have an aversion to any soldering/fiddling that
may be necessary.  Thanks in advance.

El Duderino/OtoDoc


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-17 Thread Mark Lanctot

El Duderino;163137 Wrote: 
 A quick question.  Are the 5 pin DIN connectors plug-and-play compatible
 with the Squeezebox? I am referring to the power supply referenced in
 Tyler's second link.  I have an aversion to any soldering/fiddling that
 may be necessary.  Thanks in advance.

No.  A 5-pin DIN connector looks like this:

http://www.maplin.co.uk/images/full/24516i0.jpg

But the Squeezebox's power plug looks like this:

http://www.hardware-one.com/reviews/nexland_pro800turbo/power_adapter_110V.jpg

You would have to solder.  It would be easy, but there's no way around
it.


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-17 Thread Skunk

Well.. there is crimping, which isn't soldering- but you'd need a
multimeter to check polarity, which is fiddling.


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-17 Thread El Duderino

Thanks for the rapid replies.  I would like to give a linear power
supply a try at some point but I am not entirely convinced by the
arguments put forth in support of the Bolder modded Elpac.  That is not
to say that no difference exists...

Ideally, I'd like to test out any potential improvement for a low-cost
price.  If there is any improvement, I would then consider purchasing
pricier options.  So, with that in mind, any plug and play,
inexpensive, linear power supplies readily available these days?

El Duderino/OtoDoc


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[SlimDevices: Audiophiles] Re: brand new 5V 6A linear power supply source

2006-12-17 Thread Greg Erskine

El Duderino;163144 Wrote: 
 Thanks for the rapid replies.  I would like to give a linear power
 supply a try at some point but I am not entirely convinced by the
 arguments put forth in support of the Bolder modded Elpac.  That is not
 to say that no difference exists...
 
 Ideally, I'd like to test out any potential improvement for a low-cost
 price.  If there is any improvement, I would then consider purchasing
 pricier options.  So, with that in mind, any plug and play,
 inexpensive, linear power supplies readily available these days?
 
 El Duderino/OtoDoc

I believe there is a substantial difference between the standard PSU
and other alternatives for a SB3, at least on my system. I've tried
linear supplies, batteries and a computer PSU. I wouldn't dismiss any
particular topology because one example wasn't good. For example, my
old $5 XT computer PSU sounds very good, as good or better than other
options I have tried, but it does introduce hum and other very unusual
background noises. Different regulators also seem to make a
difference.

Forget about argumnets, you need to try for yourself to see if you can
hear a difference.

BTW: I'm using my Transporter as a benchmark.

regards
Greg


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