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Class D Switching Power Amplifiers and Power D/A conversion

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Old 23rd July 2010, 07:28 PM   #581
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Quote:
Originally Posted by dayu View Post
Now i have bin reading this for like 2h. My first Lepia broke after a few days and annother is on the way.
My knowledge on all the names and nummers that u guys type is Zero! So i need, as a few of the members requests, is a turtorial. Not just name on stuff u need. We need detaild picture "where" to put "what" on the Lepia. IT whould really help me and some of the others novis here wrry much.

* My first consern is how to NOT make it break after 2 days
* Then how to, easyle, switch some parts to make it work better.
* Make the instruktions simple, so 5 year old can make it.
* Retard as i am, i need pictures, pictures with arrows where to put the part and so on.

I live in Sweden so i rather not have som links to ebay, have no time to wait and to pay for shippment.


I really hope for an awnser on this post, and i hope my limping english works =)
// Gunnar
I would also really appreciate if someone would take the time to point out what needs to be done for the Lapai not to break so easily. My first unit went 'ticking' after a couple of hours.

After reading this thread I understand that the zener diode needs to be removed. Could someone please circle it on a picture of the Lapai?

Thank you in advance!
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Old 26th July 2010, 01:41 PM   #582
tinitus is offline tinitus  Europe
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dayu, dont try swearing by cheating the auto censure with dots etc
I had to delete your post

please try and present your case in a better manner
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Old 26th July 2010, 02:23 PM   #583
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Oh man, just got my second lepia, just took away the zener with out problems. Test run it, no problems there... then i try run it again and all i hear is the freaking clicking from the speakers....

Ether im just un lycky or the person that i got it from is riping me off.
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Old 26th July 2010, 10:15 PM   #584
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dayu, from what I understand if you've got clicking after removing the zener then you've likely removed the wrong zener.
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Old 27th July 2010, 11:39 AM   #585
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I removed the zener that is marked with "X" on this picture

http://www.diyaudio.com/forums/attac...ta2020-psu.jpg

it worked after i removed it, then i turnd it off and tried to start it again and nothing....
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Old 27th July 2010, 12:59 PM   #586
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Quote:
Originally Posted by dayu View Post
I removed the zener that is marked with "X" on this picture

http://www.diyaudio.com/forums/attac...ta2020-psu.jpg

it worked after i removed it, then i turnd it off and tried to start it again and nothing....

That's probably just a reverse polarity protection diode.. ? (someone please correct me if I'm wrong on that) The zener that's been suggested for removal is right in front of the TA2020 chip, in the middle below a ceramic capacitor. It looks like a regular glass diode, and has no text on it (not on mine anyway). From what I understand if a fault condition develops it mutes the amp that leads to the fault condition disappearing the amp starting up again, only to run into the same fault condition again --> oscillate until the chip cooks itself.
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Old 27th July 2010, 02:17 PM   #587
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Mabey u can post a picture where u think it is?

So my Lepia is broken and i cant du eny thing to fix it ?
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Old 27th July 2010, 03:32 PM   #588
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Only diode in the middle in front of the IC, can't miss it.
Don't know when I'll open the amp up again to take pictures.
Here's a pic of the removed diode though:
http://img815.imageshack.us/img815/4665/diode.jpg
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Old 27th July 2010, 04:32 PM   #589
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Thank u so werry much!
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Old 28th July 2010, 01:29 AM   #590
ppia600 is offline ppia600  United States
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Location: Louis y ana
I don't have a lepai but mine is one of the small "t" (d) amps and for some reason it hasn't played that loudly since I bought it. Model number is "SA-15". I bought it to use at work to run two 4" woofers with some nice tweeters but now am thinking I probably wouldn't even hear it. (Work on Toyotas) The guy next to me has a cheap boombox that probably has 1w total and plays fairly loud so why won't my amp with twice the rms power play fairly loudly? The two speakers in my car running off the deck blow this thing away in spl.

I'm using:
Zen micro mp3 player or output from my pc
12v/4amp power supply
two 4 ohm 5 1/4"sony car speakers for now

I tried emailing the seller explaining that the gain was way too low and they asked what power supply I was using. 4amps is more than enough to create the rated wattage but it only seems like around 1W a channel.


Any ideas? I've read a lot of this thread but haven't found anything about this yet...
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