UcD400 Q & A

[FransDHT]

Hi,

I am still working on my 5 channel amp. It turned out that all the stuff will not fit in the enclosure I purchased.

So I decided to put just one power supply in. For now that means only one 500VA transformer, but if I feel after listening that that is not enough I will get a 1000VA instead. I left room for such a transformer. Two 500VA's with their rectifiers and caps simply won't fit.

So I have a spare 500VA transformer, rectifier and two BC 10.000uF caps.

I find the soldering of wires to the rectifiers not a simple task by the way. And how do you let one supply go to 5 UcD400 modules? I use things that are used in house-electricity situations, in which you stick wire that automatically gets stuck. It's probabely not high end (not even copper), but I have no alternative at the moment.

I'll try to make some pictures in the near future.

Frans

[richie00boy]

Originally posted by ewildgoose
...I also need to fix that first Zappulse amp so I can use it for my rear surround speakers... I suspect that removing the Schafner thing would be a good first start... However, anyone want to make me an offer on it - swap for two new UCD400?

Do you want to sell the lot or just the ZAP modules? I'd be interested in either if it's going cheap.

[Jan-Peter]

Acheng:
What does on (internal pull up) means??

The /ON signal must only be connect to GND. By an open collector transistor for example.

Ewildgoos;
Oh, I should also add that the UCD400 heatsinks stay very cool on my build. In fact you could almost run them in free air I should think?

However, the output coil gets very hot... The outer casing is pretty much too hot too touch on my amps after running for a few hours at low volume. Is this reasonable?

Please don't use them without any cooling! At 60V DC the dissipation is around+/-8W, the T-shape aluminium is not sufficient. The outputcoil will be indeed +/-60oC, is no problem the coils are designed for a high temperature.

BTW, nice setup

Regards,

Jan-Peter

[FransDHT]

JP,

I planned to connect the five /ON's of my amp to a switch and the other side to ground. Is that a problem?

Frans

[Jan-Peter]

Frans,

is no problem! That's the reason why we choose for this setup

Regards,

Jan-Peter

[blackhole]

Originally posted by ewildgoose


... However, anyone want to make me an offer on it - swap for two new UCD400?

I also could de interested, if not too expensive

Piero

[ewildgoose]

OK, I know I am off topic, but if anyone does want the 1U zappulse amp, then please contact me offlist at: edward (at) wildgooses dot com.

It has a single LCaudio powersupply, twin 42v 200va transformers, softstart and dc filter. WBT terminals and balanced inputs. The power supply input filter has Y caps and almost certainly needs to be swapped for one without.

These are brutally powerful amp modules.

[mlihl]

Hello everyone and Jan-Peter,

I am building my UCD400 now and need a decent PSU.
Since Schuro is very slow and not answering my emails -
does anyone have an idea where to get two high-end
transformers? I want to build my monoblocks
with 2x10.000uF 63V Jensen 4-pole caps, bridge rectifier,
Wima and Mundorf caps for HF filtering.

I would appreciate if someone could sell me PSU parts
or tell me where to get them in Europe.

Thanks,

Michael

[richie00boy]

ewildgoose,

I replied to your email.

[micheat]

Does anyone know if the people at Schuro speak english? I also have tried e-mailing them with no success. Or does anyone know where a person could find a nice high end power supply pcb, comparable to the Schuro power pack nt-ewww.schuro.de