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Class D Switching Power Amplifiers and Power D/A conversion

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Old 21st October 2019, 10:15 AM   #31
grahamgraham is offline grahamgraham  United Kingdom
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Thanks FauxFrench and Turbowatch2, wonderfully comprehensive explanations!
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Old 28th October 2019, 10:48 AM   #32
Kjaerlarsen is offline Kjaerlarsen  Denmark
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So, when building up this amplifier, is there any way to control it via some sort of signal?
My surround reciever has a 12V output for switching on and of external amplifier.
Some sort of relay (solid state?)? or is ther something useable on the circuit board itself?
Another thing is, what if I leave the amplifier on all the time, what will happen when the preamp switches on and off?
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Old 28th October 2019, 03:08 PM   #33
kartino is offline kartino  Indonesia
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Quote:
Originally Posted by FauxFrench View Post
Hi Kjr-Larsen,

TPA3255 is one of the best chips.
And it is designed to allow post filter feedback (PFFB)!
This the big difference with other chip.
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Old 28th October 2019, 03:11 PM   #34
kartino is offline kartino  Indonesia
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Quote:
Originally Posted by Kjaerlarsen View Post
Hi.
B so I guess more than 150W/8 Ohms would not be needed.
So then UcD180 from hypex is the best for this application.
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Old 14th November 2019, 05:15 PM   #35
Kjaerlarsen is offline Kjaerlarsen  Denmark
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All parts finally arrived.
Time to drill some holes!
Or should I make a quick mock up to test that everything works?
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Old 21st November 2019, 01:37 PM   #36
Kjaerlarsen is offline Kjaerlarsen  Denmark
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Getting there.......
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Old 21st November 2019, 03:49 PM   #37
Kjaerlarsen is offline Kjaerlarsen  Denmark
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Got to test the amp with a set of speakers in the basement. And everything works, and plenty of power. No noise at all, except for the cooling fan for the power supply. Quite noisy, even though stated that it is temperature controlled. So took the lid off.
Going to hook it up to my stereo tomorrow. Going to be interesting to hear the sound quality.
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Old 24th November 2019, 06:02 PM   #38
Kjaerlarsen is offline Kjaerlarsen  Denmark
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Got time to spend a few hours listening on my stereo.
First impressions are good. Theres absolutely no noise of any kind. Low end is deeeeep and very well controlled and tight! Midrange is okay, not quite as detailed as my Rotel amplifier, but not bad at all. High end lacks a little detail but quite neutral. Sound stage is not as wide and deep as I could wish for, but it does nothing wrong, just not quite up where I would have liked it to be.
But considering the building cost of around 200 it certainly performs well!
Im considering building a new amplifier using the Hypex ucd180hg modules, I guess I will get the details and soundstage Im looking for.
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Old 25th November 2019, 12:09 AM   #39
denbret is offline denbret  Canada
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Hello,

it joins my own appreciations.

This amplifier can be improved with the change of the OP (not try again), so I think that changing the SMD link capacitors, by better capacitors should bring what is missing as sound.
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Old 25th November 2019, 04:53 AM   #40
Kjaerlarsen is offline Kjaerlarsen  Denmark
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Originally Posted by denbret View Post
Hello,

it joins my own appreciations.

This amplifier can be improved with the change of the OP (not try again), so I think that changing the SMD link capacitors, by better capacitors should bring what is missing as sound.
Thanks for the advice. Where are these SMD capacitors located? Is it the four sitting next to the coils?
Sounds like a manageable tweak.
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