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Class D Switching Power Amplifiers and Power D/A conversion

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Old 17th September 2013, 11:32 PM   #1821
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Quote:
Originally Posted by radiosmuck View Post
Perhaps it is the tricked out components in the higher priced SMSL that is causing the interference (air coil inductors)?
Thanks for pointing out... There IS something which I did to all my Lepais. That is I have replaced all stock inductors to high current shielded ones. Perhaps this is why I don't get interference from my FM radio.

Last edited by KopiOkaya; 17th September 2013 at 11:35 PM.
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Old 18th September 2013, 07:17 AM   #1822
jjminch is offline jjminch  United States
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I have a spare 5a PS that's new if anyone needs one for cheap.

Ill be using an IPhone for my source media. I know it's lossy and crappy, but should I use the 3.5mm jack or the RCA connections? Or does it even matter?
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Old 18th September 2013, 07:46 AM   #1823
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Originally Posted by jjminch View Post
...should I use the 3.5mm jack or the RCA connections? Or does it even matter?
It doesn't matter. Both RCA connectors and 3.5mm jacks of Lepai are linked internally.

Last edited by KopiOkaya; 18th September 2013 at 07:51 AM.
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Old 20th September 2013, 03:58 AM   #1824
jjminch is offline jjminch  United States
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Thanks KopiOkaya.

I need to power an LED somehow for my VU Meter from the LP2020. It has no resistor inside, so according to the specs it can be 5v or 12v.

Originally planned on using seperate USB power but this isn't going to work. My thought was I could solder onto the metal "tabs" on the outside of the power cord jack. This should provide me with 12v I believe.

Does anyone see any problems with doing that? I thought it would be better than splicing into my power supply cable.
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Old 20th September 2013, 06:52 AM   #1825
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Originally Posted by jjminch View Post
Does anyone see any problems with doing that?
Technically, it should work. An UV meter doesn't draw a lot of current.
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Old 21st September 2013, 04:15 AM   #1826
redjr is offline redjr  United States
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Quote:
Originally Posted by jjminch View Post
Thanks KopiOkaya.

I need to power an LED somehow for my VU Meter from the LP2020. It has no resistor inside, so according to the specs it can be 5v or 12v.

Originally planned on using seperate USB power but this isn't going to work. My thought was I could solder onto the metal "tabs" on the outside of the power cord jack. This should provide me with 12v I believe.

Does anyone see any problems with doing that? I thought it would be better than splicing into my power supply cable.
Is the LED the only thing you need power for, or the VU meters too? 12vdc will kill a LED almost instantly if no limiting resistor is used. 5v is a safe voltage without using a resistor.
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Old 21st September 2013, 07:16 AM   #1827
jjminch is offline jjminch  United States
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I used a 1k ohm resistor as the instructions stated. I hooked it up and nothing worked for the backlight. This is just to power the LED. According to my test light I had the wires in the correct location.

VU meter works though and looks cool. Only downside is unless you crank it up, don't see much movement of the needle.
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Old 23rd September 2013, 06:50 AM   #1828
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After i played my Lepai, it doesn't getting better (as i said last week it's getting hot and pop-off soung louder), i guess there's something wrong with it.
So, i choose to mod it again, bypassing tone control, change input and output connector..tralaaa... It's better now, Love it more now..
Click the image to open in full size.

Last edited by jarscrew; 23rd September 2013 at 07:10 AM.
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Old 23rd September 2013, 05:30 PM   #1829
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Default Best (cheap) power supply for Lepai 2020

New user here. I just bought one of these amps and LOVE it. Believe it or not, they are powering a pair of Boston Acoustic VS260 bookshelf speakers in a nearfield PC setup and it sounds great!

Quick question...I'd like to simply upgrade the power supply to get a little more headroom and slightly louder listening levels with same low distortion at lower lvls.

I was originally considering just replacing the stock 12v 2a (some say it's actually a 1.5a) power supply with a 12v 5a version. After doing a little reading, some people were saying that the 12v w/ extra amperage really doesn't do much and the key is supplying more voltage, 13.5v to be exact, for the stock Lepai.

The problem is, I can't really seem to find a cheap 13.5v / 3-5amp switching power supply!!! There are plenty of 14v/4a for <$10, but I read going over 13.5v starts to degrade SQ.

I really want to stay cheap and avoid upgrading to a indeed/topping unit that can handle the 14v b/c (surprisingly enough) I like the treble tone control on the leapi and b/c I'm cheap!!

Any ideas? Thanks in advance!
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Old 23rd September 2013, 06:24 PM   #1830
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Quote:
Originally Posted by ljbrandt View Post
New user here. I just bought one of these amps and LOVE it. Believe it or not, they are powering a pair of Boston Acoustic VS260 bookshelf speakers in a nearfield PC setup and it sounds great!

Quick question...I'd like to simply upgrade the power supply to get a little more headroom and slightly louder listening levels with same low distortion at lower lvls.

I was originally considering just replacing the stock 12v 2a (some say it's actually a 1.5a) power supply with a 12v 5a version. After doing a little reading, some people were saying that the 12v w/ extra amperage really doesn't do much and the key is supplying more voltage, 13.5v to be exact, for the stock Lepai.

The problem is, I can't really seem to find a cheap 13.5v / 3-5amp switching power supply!!! There are plenty of 14v/4a for <$10, but I read going over 13.5v starts to degrade SQ.

I really want to stay cheap and avoid upgrading to a indeed/topping unit that can handle the 14v b/c (surprisingly enough) I like the treble tone control on the leapi and b/c I'm cheap!!

Any ideas? Thanks in advance!
Found this on eBay, but I'm not sure the plug will fit:
Creative UA 1450 UA1450 AC Adapter 13 5VAC 5A Power Supply | eBay
but the ID of this one is 2.5mm whereby the lepair needs 2.1mm...hmmm
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