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Old 31st March 2012, 07:39 AM   #501
avr300 is offline avr300  Denmark
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Just mounted the 180 in a LM3886 based. Love it...

Great stuff and great value for $$

Thanks Christi.
I'm experiencing a high pitch high volume tone from the SMPS itself. Anything to do about that ?
 
Old 31st March 2012, 05:04 PM   #502
avr300 is offline avr300  Denmark
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I'm experiencing a high pitch high volume tone from the SMPS itself. Anything to do about that ?
Partially solved. The 3886 boards had 1500uF@rail local decouple. Those 4 caps upsets the SMPS. They are gone now, so are the annoying whining.

Only thing left are a faint hiss - I'll try moving the SMPS away from the modules.
 
Old 1st April 2012, 04:51 PM   #503
Cristi is offline Cristi  Europe
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Christophe, i sent the power supplies already, i'll get back to you with a mail with the tracking info in the following days after i get it from shipping company.
Jesper, the whinning could be caused by a particular voltage setting where the control loop stability is narrow at a given current draw and the easiest way to avoid it is to increase or decrease by one-two volts. The SMPS180QR as well as SMPS250QR use quasi-resonant flyback topology, and besides the regular voltage feedback loop found in most of the power supplies, there is a self-synchronizing circuit which helps to achieve the quasi-resonant operation and the values of this circuit has to be tuned too. overall, the target is the output voltage stability and the lowest switching noise, without decreasing the efficiency, primary required for an audio amplifier. If the output voltage is stable, should not worry about the transformer noise. If is annoying, replacing one or two resistors the noise can be reduced.
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Old 1st April 2012, 04:58 PM   #504
avr300 is offline avr300  Denmark
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Originally Posted by Cristi View Post
Jesper, the whinning could be caused by a particular voltage setting where the control loop stability is narrow at a given current draw and the easiest way to avoid it is to increase or decrease by one-two volts. The SMPS180QR as well as SMPS250QR use quasi-resonant flyback topology, and besides the regular voltage feedback loop found in most of the power supplies, there is a self-synchronizing circuit which helps to achieve the quasi-resonant operation and the values of this circuit has to be tuned too. overall, the target is the output voltage stability and the lowest switching noise, without decreasing the efficiency, primary required for an audio amplifier.

If the output voltage is stable, should not worry about the transformer noise. If is annoying, replacing one or two resistors the noise can be reduced.
The voltage is stable, but the whining is annoying. I'll like it to be dead silent - and to be able to run at 27v instead of 32v.

Tell me, which resistors is to be replaced and by which values - I'll gladly make the test. After all, it is DIY.

Last edited by avr300; 1st April 2012 at 05:14 PM.
 
Old 1st April 2012, 05:24 PM   #505
Cristi is offline Cristi  Europe
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Default SMPS180QR

Start by changing the value of R11. the value is 100K or 150K depending on the board version. see the layout screenshot. i suggest to use a 220K potentiometer in series with 10K resistor which will be soldered with ~ 10cm long wires on the board and tune till is noiseless without compromising the voltage stability. try this first, dont touch anything else.
will be a lot of fun to reach that resistor and you will bless me a lot for that because is under the transformer, and to take out the board from the shell will need some effort and tools. try to not damage-it, will be great.
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File Type: jpg SMPS180QR PCB.JPG (80.7 KB, 686 views)
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Old 1st April 2012, 05:35 PM   #506
avr300 is offline avr300  Denmark
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you will bless me a lot for that because is under the transformer
Hereby blessed

Just love compact designs - as long as you're not to reach the hidden parts.

I'lll report if I choose not to run at 32v.

Thanks Cristi.
 
Old 1st April 2012, 11:30 PM   #507
glt is offline glt  United States
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...
will be a lot of fun to reach that resistor and you will bless me a lot for that because is under the transformer, and to take out the board from the shell will need some effort and tools. try to not damage-it, will be great.
Ahhh... Just like trying to change the oil filter in an automobile :-)
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Old 19th April 2012, 07:10 PM   #508
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I christi i resolv my hiiiiiiiiiii problem it's come from the amp i use, for the little noise i've heard i put resin in the transformer...
 
Old 23rd April 2012, 07:17 PM   #509
avr300 is offline avr300  Denmark
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Cristi, can we expect to see a 500RE ?
 
Old 3rd May 2012, 11:36 AM   #510
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Default Witch SMPS to build an Amp based an Hypex UCD180

Hi Everybody. Hi Cristi.

I would like advices about what SMPS i should choose to feed an UCD180HG maybe HR (as you probably knows between +/-30V and +/-50V voltage input) for a 2.0 amp at the fist time with an extension to 5.0 later, and why not or 7.0
It would by used 80% Hifi and 20% HomeCinema.
Today i have an Poppulse TA2024 (77W at 8 ohms) used for stereo, it is really enough for my 25M2 living room.

I red a part of the threat, and even if the question should have be asked thousand times...

I browsed in détail your web site and find several SMPS that can be used for UCD : SMPS300R, SMPS200QR (no aux output ?)...
The link to the detail datasheet of SMPS200QR failed

I established several configurations
For 2.0 AMP UCD180HG HR
> 1 SMPS300R by module
or 1 SMPS500R for 2 modules
or 1 SMPS800R
or more ?

2/ For 5.0 AMP 2xUCD180HG HR + 1xUCD180HG (or HR) for central+ 2 UCD180ST for surround
> 1 SMPS300R by module
or 1 SMPS200QR by module (great because extremely compact)
or1 SMPS500R for 2 modules + 1 300R for central module + 1 300R for 2 surround modules
or 1 SMPS800R for the 3 main modules + 1 SMPS300 for surround
or ?

Is it insane to have only one A1000SMPS to feed 2, 3 or 5 UCD180 modules for instance ? Is the voltage is tunable by myself or fixed by you, like the others SMPS ?

As you see, i am quite lost..
What would be your suggestions ?
Thanks for your answer.

Regard. Ben
(as you probably understood, i am a very newbie)
 

 


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