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Class D Switching Power Amplifiers and Power D/A conversion

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Old 14th April 2010, 01:28 PM   #21
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Quote:
Originally Posted by brookbh View Post
thats pretty cool. Where did you get the plate for all of the connections?
Do you mean the RCA/speaker terminals. That is a simple home audio connection setup for wiring a home. You can buy them at lowes or Home Depot.
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Old 23rd April 2010, 10:17 AM   #22
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Beautiful
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Old 1st May 2010, 02:24 PM   #23
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Thanks, I have burned it in now for about a hundred hours. This amp combined with the Decware tube pre, and ADS speakers, is opening up into a great little stereo

It has a sweet spot at Medium volume levels. The Decware has an adjustable line level out voltage and the Tripath likes the lowest setting. I'm sure the Decaware adds much to the SQ I'm hearing but the two seem to match up very well.

Last edited by stoutblock; 1st May 2010 at 02:29 PM.
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Old 19th July 2010, 12:48 PM   #24
IvRak is offline IvRak  Denmark
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Stoutblock:

Due to your good experiences with this amplifier, I have ordered my self two of these.

I'm very curious as to how good they are going to be.

They will go into my Surround setup suplementing my Hypex UCD400HXR's, which will
drive the main front speakers.
These two amplifiers will then drive the rear speakers, and the center speaker (one of them will run in bridged mode for the center).

Eventually, this will enable me to replace my mid-level Surround receiver, with a higher-end Surround preamplifier, and give me more flexibilty for coming updates.

I'm very much looking forward to building these, and to begin finding my coming preamplifier.
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Old 6th August 2010, 12:09 AM   #25
IvRak is offline IvRak  Denmark
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Just a follow up.

I have now finished a temporary build with these two amplifiers.

Besides them being caught up in the toll-office, and costing me more money because of this, they have been real easy to buy, and get up and playing. All in all a pleasant experience, and auspicious have been helpfull answering questions.

They produce a very nice full, and detailed sound, allthough they cant match my Hypex UCD400HG's. I didn't expect them to either, so thats OK.
They are a definate upgrade from the integrated amps in my Surround Receiver! So I'm very satisfied.

I do have one problem:

I have installed them so that they are fed from a 2x24V (300VA) torroidial transformer, and the 12V input from another torroidial transformer. Both amps are fed from the same transformers.

If I connect line input to one of the amplifiers all is fine. Crisp noisefree sound. But as soon as i connect the line-in to the second second amplifier, I get a very noticeable hum from all 4 speakers.

I have tried to rectify this by grounding the amps to the cabinet and connecting the GND power inputs on each amp to each other, but it only helps a little. If I use the amps as is, the hum is unbearable.

I have reduced the hum using the supplied volume controls. If I turn the volume down to under 50% the hum is not disturbing anymore, but is still there, you can hear it if you put you ear close to the speaker.

The receiver corrects for this low input setting by turning up the volume sent to these channels so it works ok, but I would rather have the problem fixed, so I don't have to use the volume controls.

Anybody got any good advice?

Sorry if my post gets to long or detailed, its not easy for me to describe in shorter terms.

Last edited by IvRak; 6th August 2010 at 12:20 AM.
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Old 12th August 2010, 04:51 PM   #26
IvRak is offline IvRak  Denmark
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Just an addition to this post (if anybody is reading).

When running a complete setup with my surround amplifiers build in Audissey Room EQ, it complained that these amplifiers reverse the phase. So in my case I have to connect the + terminal on the speaker, to the - terminal on the amps.

Other than this I have had no problems, except the humming, which I still have.

Guess I will have to rewire the amplifier supply ground, and the grounds from signal inputs, with some sort of common grounding to reduce it...

Still open for ideas
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Old 12th August 2010, 06:50 PM   #27
teamacc is offline teamacc  Netherlands
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Try cutting one of the ground wires to the net, it sounds like an ordinary ground loop.
Once identified, go fix it.
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Old 13th August 2010, 07:28 PM   #28
IvRak is offline IvRak  Denmark
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Thanks for the suggestion.

I only have 1 ground wire to the net, so cutting it does not seem beneficial.

But moving around the ground wires after the transformers has helped quite a bit.

I am however thinking of buying a second transformer, so that the two amplifiers can have each their own supply, and thereby be isolated from each other.

I think this is the best solution.
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Old 13th August 2010, 07:48 PM   #29
teamacc is offline teamacc  Netherlands
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Youll create another groundloop after the transformer by doing that. If you buy one additional transformer, you need to cut one of its groundwires for sure.
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Old 13th August 2010, 08:33 PM   #30
IvRak is offline IvRak  Denmark
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Are you saying that if I buy a second transformer, and build the two amplifiers in each their own cabinet, with no connection to each other, I will stil get a groundloop?

And I'm not sure what you are trying to tell me about cutting groundwires.

The transformer I use now has two separate 24V outputs, where they are connected so that they produce 48V together, by connecting the two "minus" cables together.

If I cut one of these, power wont flow from one of the outputs, and I'm quite certain the thing wont work?

What other ground do you want me to cut? There is only two wires supplying the tranformer.

Sorry if I'm being stupid, but I just dont understand what you want me to do...
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