UCD180 questions

[Jan-Peter]

Picture transformer.

Jan-Peter

[peranders]

That was cool, with rounded core. Brand?

[Jan-Peter]

Peranders,

Special custom made on our request. The weight is lower as with a traditional transformer and becuase the wires are winded on a cirkel you need less length of wires (decrease copperresistance) and have much less mechanical noise......


Regards,

Jan-Peter

www.hypex.nl

[jam]

Bruno,

What is the lowest impedence that the modules will work in a) standard mode b) bridged mode to operate safely.

Regards,
Jam

[peranders]

Originally posted by Jan-Peter
Peranders,

Special custom made on our request. The weight is lower as with a traditional transformer and becuase the wires are winded on a cirkel you need less length of wires (decrease copperresistance) and have much less mechanical noise.....

Torema here in Sweden made toroids with rounded corners and they had only plastic film as insulation towards the core.

I'll think the swedish Torema is no more....

[Bruno Putzeys]

Originally posted by jam
What is the lowest impedence that the modules will work in a) standard mode b) bridged mode to operate safely.

It'll always work safely. If the current gets too high it'll protect...

The peak current of the UcD180W is 9A. For the 400W it'll be on the order of 20A. This means the lowest useful load impedance in bridged mode is twice that of unbridged mode.

[phase_accurate]

How does one get 180 watts into 4 ohms with a peak current of 9 Amperes ? Or is this a short-term RMS value ?

regards

Charles

[Bruno Putzeys]

Excuse my bad habit of quoting only one significant digit. I got scolded for that at school, but for most intents & purposes you don't need to know voltages/currents to better than 10%.

Except now of course.

Depending on tolerances, the protection will act anywhere between 9.5 and 11A.

[pburke]

Originally posted by Bruno Putzeys

The peak current of the UcD180W is 9A. For the 400W it'll be on the order of 20A. This means the lowest useful load impedance in bridged mode is twice that of unbridged mode.

Put me on a waiting list for four of these modules

My Magnepan speakers are having those 20amps for breakfast (at about 2.5ohms in the woofers). I'm planning to biamp with a pair of UCD400 or bigger stereo amps - big transformers, etc.

What level of capacitance would you plan for in a totally overbuilt amp like this (my current Class A/AB monos have 180,000uF per channel and they seem to be "adequate" for the job when the going gets rough)? I'm thinking 1000va transformers and 40,000uF per channel, possibly a little more for the low end. Can one put too much capacitance in a power supply (I'd bypass the last set of caps with Auricaps)?

And while I am digging for PSU answers: Would a pseudo dual mono supply be beneficial in my setup (one channel drives mids and tweeter ribbon, the other the bass), or should I just build 4 mono blocks to be on the safe side? And if I do - is it easy to match the gain of these modules (or match gain between a UCD400 and a UCD700)?

And while I am lurking - do you expect that mother of all modules at 700-900w to be available before the end of the year maybe?

I'm glad I found out about these modules, because I had just given up on the ZapPulse for cost reasons and mostly lack of apparent DIY enthusiasm around it.

Another questions - do these amps need to be powered up all the time to perform at their best? My Class A/AB amps for example are supposed to be on all the time to sound their best when they are asked to dish out the amps...

Soft start - if I don't use one - what happens on the output at power up? Big thump? My speakers have no fuses left in them, so I can't afford that.

Chassis - is a full metal enclosure necessary, or would part metal and part ERS absorbing materials in strategic locations near the PCB suffice? I'm planning a chassis similar to Peter Daniel's Acrylic/heat-pipe gainclone...it's gotta look cool!

anway - keep the thread going - i'm taking notes about capacitor tweaks and other issues as I'm waiting for the big hitter modules to be released.

Peter

[classd4sure]

Hi,

Sorry for taking it off topic again but since it got bashed around here..

Paulmc was so kind as to answer some of my questions and I thought I'd pass them along.

"discrete analog input stage
with its own power supply, high common mode rejection, zero feedback,
output complimentary pair, decoupling components from the class D etc"

and

"Feedback in the HCA-2 is a bandwidth limited feedback around the Class D
stage that's pretty unique in my experience. Yes, it measures at the
output of the coil."

So that's all we're going to know.

Back on topic.


Pburke, that sounds crazy! Looking forward to seeing it.

I don't think the modules require soft start themselves, but with the kind of supply you're talking about though, wouldn't you really want to have soft start? What size breaker to you do you run that to?

Regards,
Chris