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Old 13th October 2010, 05:35 PM   #1751
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having replaced the buffer opamps from 5234 to LM4562 and prepared the module to accept an external buffer supply, would I be able to supply 15v or would I have to stick to 12V? The LM4562 definitely can, but are there any other parts that would object?
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Old 18th November 2010, 11:02 AM   #1752
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Can someone send me a copy of UcD400 datasheet R10 version? I have only R9 on hand, but I need R10 for my UcD400 sample evaluation.
Thanks
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Old 19th November 2010, 02:44 PM   #1753
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Guys, a question about grounding.

I have finished my 5 channel UCD400 with 3 SMPS inside. Currently, the 3 SMPS don't share any ground connection (All XLR connectors isolated from the casing) - but it's all driven from a single preamp which does share the ground connections.

Now I want to use a 12V trigger to turn on/off 3 modules which are shared on 3 SMPS - building a circuit with a single transistor (or optocoupler) will mean that the 3 SMPS will be sharing ground that way, possibly creating a ground loop.

What is my best option here? Connect all XLR grounds together, or leave it all as is? Connect all the SMPS grounds together?

Thanks
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Old 19th November 2010, 05:54 PM   #1754
greggp is offline greggp  United States
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Quote:
Originally Posted by Yves Smolders View Post
Guys, a question about grounding.

I have finished my 5 channel UCD400 with 3 SMPS inside. Currently, the 3 SMPS don't share any ground connection (All XLR connectors isolated from the casing) - but it's all driven from a single preamp which does share the ground connections.

Now I want to use a 12V trigger to turn on/off 3 modules which are shared on 3 SMPS - building a circuit with a single transistor (or optocoupler) will mean that the 3 SMPS will be sharing ground that way, possibly creating a ground loop.

What is my best option here? Connect all XLR grounds together, or leave it all as is? Connect all the SMPS grounds together?

Thanks
Just curious, what SMPS did you go with?
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Old 19th November 2010, 10:21 PM   #1755
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3 times Hypex SMPS400. I couldn't afford 5x mono, and I still had a couple of 400AD's. So I went for a configuration with 1 SMPS powering front left & rear right - 1 SMPS front right & rear left - 1 SMPS center. Front channels are 400HG's HxR - rear channels 400AD's modified for higher voltages.

The trigger circuit I want to build will turn off center and rear modules, effectively turning the amp into a dual mono.

Over dimensioned, especially into 8 ohms speakers. Granite solid amplification for my system.

Thursday I added a W4S DAC-2 (Sabre32 DAC) for music duties - it takes time to open up but now, after a good 20h of running it's starting to feel like I'm in my own audio nirvana.

Click the image to open in full size.

Click the image to open in full size.
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Old 20th November 2010, 01:08 AM   #1756
greggp is offline greggp  United States
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Quote:
Originally Posted by Yves Smolders View Post
3 times Hypex SMPS400. I couldn't afford 5x mono, and I still had a couple of 400AD's. So I went for a configuration with 1 SMPS powering front left & rear right - 1 SMPS front right & rear left - 1 SMPS center. Front channels are 400HG's HxR - rear channels 400AD's modified for higher voltages.

The trigger circuit I want to build will turn off center and rear modules, effectively turning the amp into a dual mono.

Over dimensioned, especially into 8 ohms speakers. Granite solid amplification for my system.

Thursday I added a W4S DAC-2 (Sabre32 DAC) for music duties - it takes time to open up but now, after a good 20h of running it's starting to feel like I'm in my own audio nirvana.

Very impressive. How do you like the performance of the Hypex SMPS compared to their linear power supplies? I haven't read much discussion of their SMPS regarding sound quality. Hypex hasn't said much to praise them, but that's also true of their other products. They sure aren't prone to hyperbole.
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Old 23rd November 2010, 01:22 PM   #1757
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The SMPS are impressive. I can't possibly get near max power on these modules, but at testing I was running one SMPS with two modules - turning up volume and never heard any form of compression (=telltale PS can't keep up) - idling, the modules are silent just like with a linear PS. Sound to me is as perfect as it comes. With the DAC-2 now, the UCD's+SMPS just sing. If I went overkill, it's because I can - plenty power

PS. Google on IANMAC ATC UCD400 - you'll find a thread with a very happy SMPS+UCD user.

Last edited by Yves Smolders; 23rd November 2010 at 01:37 PM.
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Old 12th October 2013, 08:55 AM   #1758
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Hi Jan-Peter

I have got a question about over current protection of UCD400

In datasheet UCD400 from Hypex,over current protection is 18A peak,I see UCD400 use resistor R = 0.05R/2512 in place from B+ to Drain of power mosfet (FDP42AN150/TO220),if I=18A,R=0.05ohm => P(on R) = 18x18x0.05 = 16.2W peak # 11.45W rms, resistor size 2512 not enough power 11.45W,I want to question this resistor can really safe? if I always use at near level 18/1.4142 = 12.7A example about 12A(# 24Vrms signal ouput) with 2 ohm load resistor(not speaker) at output and input is sinwave 50-60hz?

Thank you very much
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Last edited by hien.t.nguyen; 12th October 2013 at 09:20 AM.
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Old 25th October 2013, 03:48 PM   #1759
greggp is offline greggp  United States
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I have a multichannel setup with 5 UCD amp modules (3 x UcD400AD and 2 x UcD180AD). One of my UcD400AD modules has crapped out and I am trying to find a replacement. Unfortunately it is way past warranty and is no longer available for sale. The amp was built in 2005.

If any of you have upgraded to a newer UcD module, like the UcD400ST or UcD400HG (or even jumped to the new nCore modules), and have a spare UcD400AD module, would you be willing to sell it?

Otherwise, what current UcD400 module is the best match for replacing my UcD400AD?

Thanks!
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Old 25th October 2013, 09:47 PM   #1760
yairf is offline yairf  Israel
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Quote:
Originally Posted by greggp View Post
I have a multichannel setup with 5 UCD amp modules (3 x UcD400AD and 2 x UcD180AD). One of my UcD400AD modules has crapped out and I am trying to find a replacement. Unfortunately it is way past warranty and is no longer available for sale. The amp was built in 2005.

If any of you have upgraded to a newer UcD module, like the UcD400ST or UcD400HG (or even jumped to the new nCore modules), and have a spare UcD400AD module, would you be willing to sell it?

Otherwise, what current UcD400 module is the best match for replacing my UcD400AD?

Thanks!
Hi Greg
I have one spare UCD400AD module which I can offer you at cost, it has better caps than original and works flawlessly (I kept the 8620 intact).
My email address is yair at audioclinic dot co dot il.
Cheers
Yair
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