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Class D Switching Power Amplifiers and Power D/A conversion

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Old 4th April 2013, 03:50 PM   #201
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No. They only mention 4ohm and 8ohm configuration. Probably best to stick with the default values on your board in that case. I'm not qualified to make a judgement of what values to use or why to use such values.

Perhaps someone else around here is.
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Old 4th April 2013, 05:33 PM   #202
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Quote:
Originally Posted by Fukinagashi View Post
What is the role of the output caps (near the inductors) I see in the pictures?
Are they worth to be changed?
They are part of the low pass filter that turns the Class D output square wave into an audio signal. You could use better caps (film, as these are most likely ceramic), but stick with the values shown unless you know how to calculate the right values for your speakers.
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Old 5th April 2013, 01:41 AM   #203
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Default Cool PS

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Originally Posted by sofaspud View Post
There was a change in plans.
I ended up taking the power supply I was using for a T-amp (an old Radio Shack #22-124; 2.5A/5A surge) and using that with the Lepai. Then I built a new supply for the T-amp.
Great! I try to source older, real iron transformers for a PS also.
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Old 5th April 2013, 02:53 AM   #204
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It's a pretty good unit. Common parts and the schematic is available online. Mine is all-original and still going strong at 35 years old. There's one on ebay now for a $25 bid including shipping.
I never met a power transformer I didn't like. I'll salvage 'em all, and have a few 5 gallon buckets full of different types.
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Old 9th April 2013, 04:11 PM   #205
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Great Thread. I will be ordering one of these from PE soon and was wondering what are the most significant mods are so I can order what else I need from them at the same time, provided PE has what I will need.
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Old 9th April 2013, 04:24 PM   #206
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Just a small note to those who plan to heavily modify the Lepai:

If you plan to remove and/or bypass the volume and tone controls, and then spend some money on upgrading some other components, I suggest an alternative; buy this instead http://www.ebay.ca/itm/370738187019

It already has better components installed and it sounds fantastic compared to a stock Lepai, and it is basically the same price. Hook up your pre-amp of choice and Bob's your uncle. Sure you can still upgrade the main power cap to a bigger one and maybe stick in some POI input caps (I did both) but overall this is a better way to spend the 20 bucks and change, if you don't need the volume/tone and ugly chassis.

Last edited by cogitech; 9th April 2013 at 04:26 PM.
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Old 9th April 2013, 04:59 PM   #207
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The lepai amplifiers are so bad they are not even worth modifying, a much better value for money is the SMSL SA-S1 amp.
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Old 9th April 2013, 05:44 PM   #208
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While I appreciate the answers, I like to mod stuff and I also like to keep, what I can, of the U.S dollars I have in the U.S.

This little thing is going to be used only for background music from a laptop in my machine/fab shop. From what I am seeing at PE and what's available from them, it looks like I would have to get any mod parts from Mouser anyway.
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Old 13th April 2013, 04:02 PM   #209
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Default Output caps

Quote:
Originally Posted by Fukinagashi View Post
Is there a suggested value for a 6 ohm speaker?
The TA2020 datasheet application test circuit shows 4 or 8 ohm load can be used, however there is an asterisk beside the 8ohm. In the notes section under the circuit, it states:

* Use Co = 0.22μF and Cz=0.22uF for 8 Ohm loads

That being the case I would try .33uF for 6 ohm.

Make one mod to one channel then compare left to right.
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Old 13th April 2013, 04:50 PM   #210
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Quote:
Originally Posted by THUMP LUMP View Post
While I appreciate the answers, I like to mod stuff and I also like to keep, what I can, of the U.S dollars I have in the U.S.

This little thing is going to be used only for background music from a laptop in my machine/fab shop. From what I am seeing at PE and what's available from them, it looks like I would have to get any mod parts from Mouser anyway.
Well.. at least 'some' of the $ will go to 'muricans.
PE is only a reseller. Still a 'Made en Chine' lashup using fake components.
Although PE does give excellent service. Unlike Chinese Fleabay merchants.

IF after a cheapy? Hunt up a YJ ta 2020 amp on Fleabay.
Less Coin, also much reduced need to mod it as it's a much closer to the Tripath designed/suggested circuit.. than ANY lepai.. Box stock
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