UCD180 questions - Page 24

UrSv · 25th August 2004, 09:19 PM

Well, this one will set the standard in my living room:

classd4sure · 25th August 2004, 09:25 PM

hahaha! Give them time I say... give them time.

"We start at the beginning
Our goal for the new power amplifier series from PS Audio was to create a product that jumped the final hurdle – crossed the elusive barrier all amps in the past have been striving to achieve –(snicker) to sip from the Holy Grail of the elusive unified theory of power amplification."

Here's the page to read for a real good chuckle
http://www.psaudio.com/products/hca_overview.asp

According to them, they've "re-invented" the wheel!!!

Whew~ That's about all I can handle.

Regards,
Chris

Bruno Putzeys · 25th August 2004, 09:26 PM

UsRV: Neat!

Not that it's so critical for the 180W module (for the 400W it's more important), but I'm not seeing how the heat from the blue "T" gets conducted away to the box. If you bolt them to the box by the tapped holes in the T, you get the box to cool the amp.

Cheers,

Bruno

classd4sure · 25th August 2004, 09:26 PM

Quote:

Originally posted by UrSv
Well, this one will set the standard in my living room:

Nice! You really didn't fool around.

matjans · 25th August 2004, 09:39 PM

how necessary are heatsinks with these modules ? I;m talking about normal, in-house use with normal sensitivity speakers. It;s pretty efficient so...

btw, seems i was right about that class a class d amp marketing ** stuff

Bruno Putzeys · 25th August 2004, 09:48 PM

I run the 180w modules without additional heat sinking in open air. The Tee becomes like 60ºC.

The problem is when you lock them up in a closed box, the heat can't get out. Even a mere 3W of heat can build up to quite a temperature if you keep it in a box.

The story that "class D runs cool" is one that keeps bouncing back from marketing people. They grab the heat sink and complain hey this thing gets warm!
They don't realise that if you cash in on the efficiency advantage by reducing heat sinking, the heat sink temperature will go up again! Of course you'd feel the difference in heat output by holding your hand 10cm above the amp but that's beyond them.

JohnW · 25th August 2004, 09:55 PM

“HCA-2 Hybrid Class-A Amplifier

The novel design combines a balanced JFET input stage with a digital class D switching digital output stage. The Analog stage was designed by PS Audio's Paul McGowan, the digital circuitry is the work of John Levreault of Orvelle Technologies."

Sounds like, Class A input stage - followed by analogue Class D Output stage - with FB after the filter (But maybe dual loop) fed back to Class A input stage....

Nothing new am afraid…. Just marketing **

John

Edit :- 0.2% 1KHz 150W er ... "you know I would do this job at half the price"

with this "performance" level you can forget about dual loop FB...

UrSv · 25th August 2004, 10:00 PM

Quote:

Originally posted by Bruno Putzeys
UsRV: Neat!

Not that it's so critical for the 180W module (for the 400W it's more important), but I'm not seeing how the heat from the blue "T" gets conducted away to the box. If you bolt them to the box by the tapped holes in the T, you get the box to cool the amp.

Cheers,

Bruno

Thanks Bruno,

No worries. The T is bolted to a normal 5 mm thick L profile (20 * 50 mm) using Arctic Silver Compound between them (since it is well away from the FETs, which are insulated already as it seems, and no side effects should occur) and that L profile is bolted to the finned sides using the same compound. The shiny piece at the connector side of the PCBs is just a profile to get them same height using the 10 mm stand-offs. This means that the modules are only attached to the sides of the box and the whole sides may be removed easily. The assembly should be OK to transfer and dissipate the generated heat without too much effort or temp rise.

UrSv · 25th August 2004, 10:03 PM

Quote:

Originally posted by classd4sure

Nice! You really didn't fool around.

Fooling around. Why on earth would I do that? Did you doubt me?

classd4sure · 25th August 2004, 10:11 PM

Quote:

Originally posted by UrSv

Fooling around. Why on earth would I do that? Did you doubt me?

On a serious note, **... oops. PSAUDIO has received an invitation to join our happy forums to further discuss their successful re-inventing of the wheel, with an audience who can appreciate the technical aspect of it.

Don't hold your breath, and I won't either.

25th August 2004, 09:19 PM	#231
UrSv diyAudio Member Join Date: Jan 2002 Location: Sweden/Switzerland	Well, this one will set the standard in my living room: __________________ UrSv Those who say it can't be done should not stop those who are doing it.

25th August 2004, 09:55 PM	#237
JohnW diyAudio Member Join Date: Jan 2004 Location: Discovery Bay, Prague, Paris...	“HCA-2 Hybrid Class-A Amplifier The novel design combines a balanced JFET input stage with a digital class D switching digital output stage. The Analog stage was designed by PS Audio's Paul McGowan, the digital circuitry is the work of John Levreault of Orvelle Technologies." Sounds like, Class A input stage - followed by analogue Class D Output stage - with FB after the filter (But maybe dual loop) fed back to Class A input stage.... Nothing new am afraid…. Just marketing ** John Edit :- 0.2% 1KHz 150W er ... "you know I would do this job at half the price" with this "performance" level you can forget about dual loop FB... __________________ Life shouldn’t be take it too seriously, you will not come out alive anyway…

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

25th August 2004, 09:25 PM	#232
classd4sure Account Disabled Join Date: Feb 2004	hahaha! Give them time I say... give them time. "We start at the beginning Our goal for the new power amplifier series from PS Audio was to create a product that jumped the final hurdle – crossed the elusive barrier all amps in the past have been striving to achieve –(snicker) to sip from the Holy Grail of the elusive unified theory of power amplification." Here's the page to read for a real good chuckle http://www.psaudio.com/products/hca_overview.asp According to them, they've "re-invented" the wheel!!! Whew~ That's about all I can handle. Regards, Chris

25th August 2004, 09:26 PM	#233
Bruno Putzeys diyAudio Member Join Date: Apr 2004 Location: Rotselaar	UsRV: Neat! Not that it's so critical for the 180W module (for the 400W it's more important), but I'm not seeing how the heat from the blue "T" gets conducted away to the box. If you bolt them to the box by the tapped holes in the T, you get the box to cool the amp. Cheers, Bruno

25th August 2004, 09:39 PM	#235
matjans diyAudio Member Join Date: Aug 2003 Location: Utrecht, NL	how necessary are heatsinks with these modules ? I;m talking about normal, in-house use with normal sensitivity speakers. It;s pretty efficient so... btw, seems i was right about that class a class d amp marketing ** stuff

25th August 2004, 09:48 PM	#236
Bruno Putzeys diyAudio Member Join Date: Apr 2004 Location: Rotselaar	I run the 180w modules without additional heat sinking in open air. The Tee becomes like 60ºC. The problem is when you lock them up in a closed box, the heat can't get out. Even a mere 3W of heat can build up to quite a temperature if you keep it in a box. The story that "class D runs cool" is one that keeps bouncing back from marketing people. They grab the heat sink and complain hey this thing gets warm! They don't realise that if you cash in on the efficiency advantage by reducing heat sinking, the heat sink temperature will go up again! Of course you'd feel the difference in heat output by holding your hand 10cm above the amp but that's beyond them.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)