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Class D Switching Power Amplifiers and Power D/A conversion

I AM D v200, Fx Audio d802, optimisation and TPA3116
I AM D v200, Fx Audio d802, optimisation and TPA3116
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Old 21st May 2016, 10:13 AM   #251
Solve is offline Solve  Sweden
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Quote:
Originally Posted by burgunder View Post
Could it be possible to lower the gain of the D802?
For me that should solve the problem but I dont have the skill to sort that out.
My TPA3118D2 is very quit with the 20db gain mod.
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Old 21st May 2016, 10:53 AM   #252
Solve is offline Solve  Sweden
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Dont know if this exactly is same as mine but maybe someone understand if it
possible to change the gain setting.
http://www.st.com/content/ccc/resour...CD00062804.pdf

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Old 22nd May 2016, 10:10 AM   #253
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I don't think there is a way to set gain by hard wire. The only setting possible for st326 is in software mode.

A correction for the D802 two LM317 voltage, the one under the heatsink output 5V, the other one is 3.3V.
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Old 22nd May 2016, 10:48 PM   #254
Solve is offline Solve  Sweden
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Quote:
Originally Posted by ChuckT View Post
I don't think there is a way to set gain by hard wire. The only setting possible for st326 is in software mode.

A correction for the D802 two LM317 voltage, the one under the heatsink output 5V, the other one is 3.3V.
I looked after any software settings in the programmable for the gain but can't
find any.
So, maybe i'ts bad components like the LM317?
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Old 27th May 2016, 05:21 PM   #255
globulegl is offline globulegl  France
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Old 28th May 2016, 04:42 AM   #256
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Here are couple pic from the modded D802. Still work in process, as you can see from the LM2596 legs being pull out. I have put additional caps in various places and will probably add more later.
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File Type: jpg SAM_5011-2.jpg (894.8 KB, 146 views)
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Old 28th May 2016, 07:31 AM   #257
Solve is offline Solve  Sweden
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Quote:
Originally Posted by ChuckT View Post
Here are couple pic from the modded D802. Still work in process, as you can see from the LM2596 legs being pull out. I have put additional caps in various places and will probably add more later.
What did you use instead of LM2596?
Any improvements?
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Old 28th May 2016, 10:22 AM   #258
ChuckT is offline ChuckT
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Quote:
Originally Posted by Solve View Post
What did you use instead of LM2596?
Any improvements?
Basically you can use any regulator if you mount it elsewhere, just made sure to correctly solder the input, output, ground pads.
I used a lt1963 board and put it on top of the power caps, the problem is the max input voltage is only 20V. I will have to give it a separate power supply in the future. Right now, the main supply is linear supply of 32V with LT1083 regulate to 20V.
No time to do serious listen yet, but this is a very good sounding amp for that low low price (after tweak). Note I have never used the original switching power supply.
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Old 29th May 2016, 07:25 AM   #259
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Quote:
Originally Posted by ChuckT View Post
Basically you can use any regulator if you mount it elsewhere, just made sure to correctly solder the input, output, ground pads.
I used a lt1963 board and put it on top of the power caps, the problem is the max input voltage is only 20V. I will have to give it a separate power supply in the future. Right now, the main supply is linear supply of 32V with LT1083 regulate to 20V.
No time to do serious listen yet, but this is a very good sounding amp for that low low price (after tweak). Note I have never used the original switching power supply.
Is the noice lower or what is good "after tweak"?
Maybe LT3015 would be a good replacement.
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Old 29th May 2016, 02:42 PM   #260
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Is the noice lower or what is good "after tweak"?
Maybe LT3015 would be a good replacement.
LT3015 is a negative regulator. I was planning to use LT3088 as replacement of 317.
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