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Class D Switching Power Amplifiers and Power D/A conversion

Lepai T-Amp with TA2020
Lepai T-Amp with TA2020
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Old 28th October 2009, 04:02 PM   #501
jlux is offline jlux  Morocco
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Join Date: Oct 2009
Hilarious, I have been planning to buy one of these amps on ebay, and I'm surprised you reviewed them so well. Thanks for posting a review. I'm planning to buy one still. I don't mean to hijack your thread, but what kind of speakers did you use with it, and is there anything budget ($45 a pair on parts express) that you'd suggest to use building a small Hifi with?
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Old 2nd November 2009, 08:29 AM   #502
Transcept is offline Transcept
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Join Date: Sep 2009
Hi all

New to posting here, but blown away by various Tripath amps I have.

Have a query, if i may. Others have posted on the strange off switch logic of the Lepai TA2020- doeasn't turn off light, etc. Someone also commented that their case gave hum.

Well, here's my situation. I could angle the amp so it didn't hum, and the off logic was an irritation not an impediment.

And i thought the amp sounded great, and liked the tone controls.

So, I thought - this amp is good - I'll just get my local hifi repair man to fix the hum and switching issue.

Which he has.

But - the amp seems now to have less bass, and what bass there is is terribly controlled.

Is this plausible?

Any thoughts, advice greatly valued.
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Old 14th November 2009, 08:14 PM   #503
FUNTIMESMAN is offline FUNTIMESMAN  United States
diyAudio Member
Join Date: Nov 2009
Default clicking sound from various speakers with lepai, then lepai making electric wheezing

Lepai LP-2020 Class T Stereo Amplifier*

and it worked great for a few hours...then maybe the music was too loud for a second or two because the one of the volume knobs on my computer got turned up, then the music would not play anymore and the speakers have a clicking sound constantly, over and over...i tried hooking up different speakers and the same thing occurs...is my t-amp ruined?

I tried unplugging everything, restarting, and turning the t-amp on and off...

any suggestions?+
why is there a cut in half power plug included?
okay an update.

now the light will not come on in the front of the t-amp. still no sound coming out of speakers connected to it. the light on the adapter plugged into the wall lights up, but there is a weird sound coming from the unit when it is turned on an plugged into the wall. the sound is not coming from the speakers but from the t-amp or from the power adapter connected to the t-amp, it kind of sounds like an electric sucking sound. i looked inside the t-amp and nothing looks burnt or wierd. the t-amp does have a little smell from it, like it got pretty warm. i tried different 12v dc power adapters and the t-=amp would not light up or turn on, but the electronic sucking sound was not there.

I bought this to use with some of the old Radio Shack Realistic Minimus 7 bookshelf speakers. These speakers are 8 ohms with a 40 watt max cat no 40-2045

I also got some klh bookshelfs (I think the came with a subwoofer originally but I just have the two bookshelfs) 9930, they are also 8 ohms...they say rear on them, for $7 at goodwill. The minimus 7's were about $50 shipped

I intend to use either or both of these sets of bookshelvs as my inexpensive recording studio near field monitors (an alternative to paying $500 for some Rockits or whatever painted lime green).

I went to Lowe's diy hardware, a home depot kind of place in the usa and bought some 10awg speaker cable by the foot for .38 cents a foot. I got four cords 8 feet long each and hooked them up to the Lepai with the spring jack inputs to the speakers spring jacks...the 10 awg gauge wire actually wouldn't quite fit in these jacks so I had to peel off a few copper strands both at the lepai and at the speakers....

I have a soldering iron...I am pretty clueless though. If somebody can tell me what and how to test for the problem and what part I should buy, it would help me a lot.

Thanks for any help everybody!
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Old 14th November 2009, 09:02 PM   #504
audi0 is offline audi0  Australia
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Join Date: May 2009
Location: 37.34 degrees South
Sorry to tell you that the Tripath chip is most probably damaged, not easily replaced for a newbie, The connection problem, if the amp was operational:
Try this from Parts Express Parts-Express.com: Gold 12 AWG Pin Compression Connector Pair | banana plug dual banana speaker connector audio connector binding post

Last edited by audi0; 14th November 2009 at 09:17 PM. Reason: ?
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Old 14th November 2009, 09:06 PM   #505
audi0 is offline audi0  Australia
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Join Date: May 2009
Location: 37.34 degrees South
Hi Funtimesman,

these are an alternative: Parts-Express.com: Gold 12 AWG Pin Compression Connector Pair | banana plug dual banana speaker connector audio connector binding post
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Old 15th November 2009, 02:26 AM   #506
FUNTIMESMAN is offline FUNTIMESMAN  United States
diyAudio Member
Join Date: Nov 2009
thanks for your reply. but i dont fully understand. what connection problem? are you saying my use of 10 guage speaker cable from home depot without some fancy ends on them was the problem? i think what happened was I accidentally turned up the volume in my emu 1820 dsp software on my pc and that sent a big spike of electricity on the speaker cable from the line outs on the emu 1820 audio interface to the lepai, overwhelming it? is that possible? now when I plug in the lepai into the power adapter that came with it (and I don't know what a cut off power cord also came with it, just half a cord and the part that plugs into the lepai?) there is a sort of wheezing sound from the lepai or the adapter, not sure. no lights come on on the lepai though, but the green light on the adapter does come on....

i already ordered two ta2020 ic chips, $12 shipped total for two of them, seemed like a good deal.

i also got two ta2022 chips for $12 shipped. both the ta2020 and the ta2022 have 32 pins, are they interchangeable?

what would be so hard about taking out my old ta2020-020 chip (if it really is burnt out
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Old 22nd November 2009, 07:24 PM   #507
QT0815 is offline QT0815  Germany
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Join Date: Nov 2009
Talking Just finished my Lepai


just want to share my "version" of modding this little beast. First i changed the potentiometer, the old on was garbage...
The new op amp is the OPA 2134 PA, don't know if this mod helped much. I also changed the input caps, resistors, coils of the signal path...
I moved some components to the backside, like the coils which are smd ones with 3.8 A. It is really tight between the coils and the case - but it fits.

Regards QT
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Old 22nd November 2009, 07:29 PM   #508
QT0815 is offline QT0815  Germany
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Talking Just finished my Lepai *PICS*

Some other views with the condensator in place. It just fit in barely.
And all components i have changed...
I made a connection with the red wire to pin 25 for lower resistance to vdd.
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Old 28th November 2009, 06:12 PM   #509
Tornado2251 is offline Tornado2251  Sweden
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C1 (installed 10n, marked 472): 5.6n
C2 (installed 47n, marked 393): 56n

I cant find these values in any store can I use 0.047 F + 0.01 F = 0.057F = 57n ?
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Old 7th December 2009, 08:00 PM   #510
Alastair E is offline Alastair E  Wales
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Location: South Wales
Have these amps got the 'Overshoot Protection' Shottky diodes fitted in their original as built condition?

These are important if you're driving the thing hard or into 'difficult or unusually reactive' loads....

--If not, this could be the reason for some unexplained TA2020-020 chip failures....
Das Beste Oder Nichts
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