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Old 15th March 2012, 06:05 PM   #1
diyAudio Member
Join Date: Aug 2011
Location: Columbia, Missouri
Default Building a regulated power supply for Lepai T-amp

I have a little Lepai "20" watt amp, and have been considering building a filtered, linear voltage-regulated power supply for it.

What would be the sonic benefits of this?

I understand that the real advantage will be much longer lifespan of a linear PSU vs the SMPS that comes with it. Also, it eliminates the issue of catastrophic failure of the SMPS damaging the amp.

But... will it really sound better? I have done plenty of research on "how" to build the PSU, and think I've got that part down, but I am just trying to decide if it will really improve the sound any.

The little lepai amp has very low distortion at the volume levels I use, but I will say the noise floor is a little higher than I expected. Perhaps a cleaner PSU will fix that.

Edit: sorry moderators, I should have probably put this under power supplies instead of class-d
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Old 16th March 2012, 12:49 PM   #2
diyAudio Member
Join Date: Aug 2011
Location: Columbia, Missouri
Well, everything I've read thus far says a good power supply can make a tripath amp really sing. Something tells me I can do better than the Vonage SMPS parts express sent with my amp.

Off topic but I will say this... I certainly like my cheap lepai amp's sound a lot better than my dad's Kenwood or my brother's Onkyo receiver.

Any opinions on toroidal vs "normal" transformers for a linear psu? I've heard both ways.
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