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Class D Switching Power Amplifiers and Power D/A conversion

UcD400 Q & A
UcD400 Q & A
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Old 20th December 2007, 09:38 AM   #1661
maxlorenz is offline maxlorenz  Chile
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Hi,
You can try mounting Tx on a thick wood plate and avoid magnetic bolt/clamping system: non magnetic bolt plus wood plate on top or those thick plastic locking tapes whose exact name I don't know in English. Apart that, adding wood to the other metal walls can help damping vibrations.

I use thick wood plates as base on most of my ugly projects...

Good luck.
M
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Old 20th December 2007, 02:51 PM   #1662
Kooka is offline Kooka  Italy
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Hi, anyone can tell me what voltage is on the status leds on the board? Maybe 12V or something? Still did not instaled the PSU, and I am to change the leds, so I need this little information...
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Old 13th January 2008, 09:55 AM   #1663
taykg is offline taykg  Singapore
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Default UCD400AD Version 6.1

Hello, I'm new to this diy hobby and with the help of a friend have managed to put together a stereo power amp based on the UCD400AD. Everything seems to be working ok.

I've been reading the threads on this forum and saw many recommendations of removing the input caps. My version has four caps very close to each other - C6, C7, C23 and C24.

I understand C23 and C24 are the input caps for the previous versions (?) but what are C6 and C7? Should they be removed as well.

Appreciate any advise.
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Old 26th January 2008, 03:30 PM   #1664
bearddavid is offline bearddavid  Bahrain
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Default And Another one for Jan-Peter

In much the same vain as the post above, I'm just putting together a pair of mono blocs built on the UcD400HG (V2 pcb) with HxR regulators.

Once I've played them "stock" for a while I'd like to try removing the input caps (I'm confident my pre-amp output is DC free and I'm implementing DC protection using the HG Mono power supply)

There have been many versions described and pictured through this lengthy thread to the extent that I'm now not at all sure which are the (OK to remove as long as I don't want warranty) Input oupling caps on my modules.

Any help (cap designation C23 etc type and value description of location , marked up picture) would be greatly appreciated.

I hope JP or Bruno sees this and can point me in the right direction.

Thanks in anticipation

Dave
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Old 27th January 2008, 01:24 PM   #1665
maxlorenz is offline maxlorenz  Chile
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Hi,
You can use a multimeter on "diode" function and trace the input path back and forth..."beeeep" means you find your cap

Cheers,
M
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Old 28th January 2008, 05:07 AM   #1666
bearddavid is offline bearddavid  Bahrain
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Hi Maxlorenz,

Thanks!

Doh ! Why didn't I think of that! Actually I guess I just wasn't thinking at all when I posted the question having got myself thouroughly confused by reading almost all of this thread in one session.

Cheers
Dave
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Old 28th January 2008, 12:21 PM   #1667
taykg is offline taykg  Singapore
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Dave,
Since I did not receive any replies on this forum, I went direct to Hypex who answered my question.

I'm not sure if you have the same version as I do but, just fyi, C6 and C7 should not be removed as these are the decoupling caps of the buffer op-amp.

Regards.
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Old 28th January 2008, 12:36 PM   #1668
maxlorenz is offline maxlorenz  Chile
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Hi Dave,
You're welcome.

I recommend that you just solder a wire between cap leads instead of desoldering them (short). The holes used to be very little making difficult finding a suitable wire.
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Old 5th February 2008, 09:29 AM   #1669
annton is offline annton  Hong Kong
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I am building a balanced DAC aiming to connect it to my two UCD400AD (have the modules but not built yet).

My plan is balanced DAC => volumn control => UCD400.

However my DAC, without coupling cap, will have 3V to 4V dc offset. Is it safe to connect as above without any coupling cap?
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Old 5th February 2008, 11:51 AM   #1670
GregD is offline GregD  United States
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Quote:
Originally posted by annton
However my DAC, without coupling cap, will have 3V to 4V dc offset. Is it safe to connect as above without any coupling cap?
No, that's way too high. A maximum of 10mV was recommended to me by Hypex.
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