UCD180 questions - Page 189

classd4sure · 8th March 2006, 06:40 PM

I'd imagine that's 46Vdc under load, at 10% mains overvoltage unloaded it might trip protection. Have to try it and see. I have 31Vac secondaries and my rails are 47Vdc unloaded.

troystg · 8th March 2006, 06:48 PM

If it does trip it won't be by much. I can throw some bleeder resistors accross the caps to maintain a slight load.

But is 500VA enough for 2 channels?

classd4sure · 8th March 2006, 06:50 PM

It's what I'm using, stays nice and clean right up to clipping, haven't been able to warm up the transformer yet.

troystg · 8th March 2006, 07:00 PM

Excellent. Thanks for the reply.

Javin5 · 9th March 2006, 12:39 AM

Hello everybody, I'm new to this board and have a UcD180 question:

What is the power consumption of the UcD180 module with zero signal. with 1 Watt output and with 10 Watt output? Has anybody ever measured this? I know that the efficiency is really good at full load, but how about at these lower signal levels?

If I use no heatsink (i.e. just the blue heatspreader) in a breadboard setup, prior to building it into a case, can I safely operate the module at low output levels up to about 1 Watt?

I did a search on these questions and so far found nothing. Sorry if I missed something and these questions have been answerde before.

maxlorenz · 9th March 2006, 01:40 AM

Hi Javin5:
Attach a metal plate to the blue T heatsink and crank it up

Good luck
M

Yves Smolders · 9th March 2006, 08:37 AM

I had the modules on for about a minute without a sink (yes, yes, I know, JP told me not to

) running very low levels (surely less than a watt) and things heated up so fast I turned it off very quickly.

Just grab some piece of alu, doesn't matter what it is and screw the UCD's to it - don't take the risk - don't forget that a few centigrades of temperature more have very negative effects on the lifetime of your electronics.

classd4sure · 9th March 2006, 11:07 AM

Think you should be alright to do a quick test with the 180 (not 400) in this way, but it just takes a small piece of aluminum to be safe.

Javin5 · 9th March 2006, 07:39 PM

Thanks to everyone for your advice. As you suggest, I will attach a piece of aluminum during tryout, just to be on the safe side.

In my UcD180, the PCB is not flush with the blue T-heatspreader; it extends just a little bit, maybe 0.5 mm. Is this common? Can the PCB just be sanded off a little bit to allow a flush mount to the side panel of the case? Or is there a risk to damage something?

I could use a thin 0.5mm thick aluminum "in-between-plate", but this would create an additional thermal junction. What do you think?

mfb · 10th March 2006, 07:11 PM

I went overboard and copied Kevin's design for my 5-channel amp.

8th March 2006, 06:48 PM	#1882
troystg diyAudio Member Join Date: Apr 2004 Location: Lousy Anna	If it does trip it won't be by much. I can throw some bleeder resistors accross the caps to maintain a slight load. But is 500VA enough for 2 channels? __________________ Troy Thinking positive doesn't make things better, it makes you a better person.

8th March 2006, 07:00 PM	#1884
troystg diyAudio Member Join Date: Apr 2004 Location: Lousy Anna	Excellent. Thanks for the reply. __________________ Troy Thinking positive doesn't make things better, it makes you a better person.

9th March 2006, 01:40 AM	#1886
maxlorenz diyAudio Member Join Date: Oct 2003 Location: osorno , Chile	Hi Javin5: Attach a metal plate to the blue T heatsink and crank it up Good luck M __________________ Cheapest horn speakers: https://picasaweb.google.com/lh/phot...eat=directlink

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8th March 2006, 06:40 PM	#1881
classd4sure Account Disabled Join Date: Feb 2004	I'd imagine that's 46Vdc under load, at 10% mains overvoltage unloaded it might trip protection. Have to try it and see. I have 31Vac secondaries and my rails are 47Vdc unloaded.

8th March 2006, 06:50 PM	#1883
classd4sure Account Disabled Join Date: Feb 2004	It's what I'm using, stays nice and clean right up to clipping, haven't been able to warm up the transformer yet.

9th March 2006, 12:39 AM	#1885
Javin5 diyAudio Member Join Date: Mar 2006 Location: Switzerland	Hello everybody, I'm new to this board and have a UcD180 question: What is the power consumption of the UcD180 module with zero signal. with 1 Watt output and with 10 Watt output? Has anybody ever measured this? I know that the efficiency is really good at full load, but how about at these lower signal levels? If I use no heatsink (i.e. just the blue heatspreader) in a breadboard setup, prior to building it into a case, can I safely operate the module at low output levels up to about 1 Watt? I did a search on these questions and so far found nothing. Sorry if I missed something and these questions have been answerde before.

9th March 2006, 08:37 AM	#1887
Yves Smolders diyAudio Member Join Date: Feb 2005 Location: Antwerp	I had the modules on for about a minute without a sink (yes, yes, I know, JP told me not to ) running very low levels (surely less than a watt) and things heated up so fast I turned it off very quickly. Just grab some piece of alu, doesn't matter what it is and screw the UCD's to it - don't take the risk - don't forget that a few centigrades of temperature more have very negative effects on the lifetime of your electronics.

9th March 2006, 11:07 AM	#1888
classd4sure Account Disabled Join Date: Feb 2004	Think you should be alright to do a quick test with the 180 (not 400) in this way, but it just takes a small piece of aluminum to be safe.

9th March 2006, 07:39 PM	#1889
Javin5 diyAudio Member Join Date: Mar 2006 Location: Switzerland	Thanks to everyone for your advice. As you suggest, I will attach a piece of aluminum during tryout, just to be on the safe side. In my UcD180, the PCB is not flush with the blue T-heatspreader; it extends just a little bit, maybe 0.5 mm. Is this common? Can the PCB just be sanded off a little bit to allow a flush mount to the side panel of the case? Or is there a risk to damage something? I could use a thin 0.5mm thick aluminum "in-between-plate", but this would create an additional thermal junction. What do you think?

10th March 2006, 07:11 PM	#1890
mfb diyAudio Member Join Date: Dec 2004 Location: petaluma, ca	I went overboard and copied Kevin's design for my 5-channel amp.

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