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Old 22nd November 2006, 10:09 PM   #41
juanito is offline juanito  Europe
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Hi, I was considering to buy autoconstruire T2020 m kit, but know I see this.
I'm totally begginer with this little amps and modding, still, the autoconstruire doesn't look to dificult.
What about Lepai t2020, is it dificult to modify? do you have any photos for modification of this litle amplifier?

I was olso thinking Trends audio amp, and follow modifications from pano's site, but 100 euros for fiddelling arround it's too risky fro me I think, were as 40 Eu, it's okay.
Still if modding lepai it's too dificult I'll just get trends or Autoconstruire.

I'll appreciate your opinion and help,
thanks
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Old 22nd November 2006, 10:14 PM   #42
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Quote:
Originally posted by juanito

Hi, I was considering to buy autoconstruire T2020 m kit, but know I see this.
I'm totally begginer with this little amps and modding, still, the autoconstruire doesn't look to dificult.
What about Lepai t2020, is it dificult to modify? do you have any photos for modification of this litle amplifier?

I was olso thinking Trends audio amp, and follow modifications from pano's site, but 100 euros for fiddelling arround it's too risky fro me I think, were as 40 Eu, it's okay.
Still if modding lepai it's too dificult I'll just get trends or Autoconstruire.

I'll appreciate your opinion and help,
thanks

This would make a very nice first amplifier if you want to mod. I think that it's almost entirely through-hole, so surface-mount work is not necessary.

If you're not afraid of surface-mount, the 41hz.com Amp32 is your best bet. 27 euros gets you a kit minus potentiometer and box, and odds are, you'd be replacing them anyway.
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Old 22nd November 2006, 11:27 PM   #43
Fin is offline Fin
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Quote:
Originally posted by juanito
:What about Lepai t2020, is it dificult to modify? do you have any photos for modification of this litle amplifier?

Still if modding lepai it's too dificult I'll just get trends or Autoconstruire.

I'll appreciate your opinion and help,
thanks
Well - the Lepai is very new to us all and only two of us actually have them in our hands at this time...........unless others have started receiving their's already.

I haven't opened mine yet but Panomaniac has. He says that it is ALL thru hole components - which appeals to me for ease of modding - but a good SMD design would probably be better if it doens't need modding or if you don't like the idea of modding and just want nice sound.

Panomaniac says that when he gets some free time, he will post some photos of the inside of the Lepai and work out some nice mods for us.......

My own experience with these Class T-Amps is limited and I have only compared this Lepai to a SI T-amp (both unmodded). They sound different. The SI has more perceived detail but lacks bass. The Lepai has a fuller and rounder sound with more bass than the SI. In stock form - I would choose the Lepai. However, with some simple mods to the SI things would probably be a lot closer. But then, the potntial with the Lepai might be greater as it uses a better chip and even more mods are possible because of the larger size components.


Quote:
Originally posted by Spasticteapot


This would make a very nice first amplifier if you want to mod. I think that it's almost entirely through-hole, so surface-mount work is not necessary.

If you're not afraid of surface-mount, the 41hz.com Amp32 is your best bet. 27 euros gets you a kit minus potentiometer and box, and odds are, you'd be replacing them anyway.
Spasticteapot is exactly right! It all depends on your level of skill, willingness to modify and tools available.

If you want something that looks great, is well built and apparently sounds good.....without having to do any modding.....then the Trends looks like a good choice.

If you want more control over the appearance and like the idea of building something....then one of the kits is the way to go.

If you want something that is ready to use but is not too intimidating to modify....then the Lepai seems sinsible.
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Old 22nd November 2006, 11:42 PM   #44
jfieb is offline jfieb  United States
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Default FYI.

Hi all, Tripath, the company is in BAD shape financially....and may not survive...

RIPATH TECH INC (OTC BB:TRPH.OB) Delayed quote data Edit
Last Trade: 0.12
TMarket Cap: 7.78M
P/E (ttm): N/A
EPS (ttm): -0.21
Div & Yield: N/A (N/A)

Perhaps someone will buy their line of chips. But if not then I wanted all the creative energy to be focued in the right place...go here


the eetimes...
A snapshot of the latest Class D devices (which can include some with analog inputs, others with digital inputs) reveals a fair degree of innovation for meeting these main objectives.

http://www.eeproductcenter.com/showA...leID=194500123

A lot of new silicon for this ...read about that jamtec one.

http://www.eeproductcenter.com/analo...leID=193100700 I am not an engineer and can't tell which of all of them sound promising, but perhpas others here can sort it out...

Hopefully something good will happen for Tripath.
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Old 22nd November 2006, 11:48 PM   #45
jfieb is offline jfieb  United States
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Default who wants to try one of these for us....

...Meanwhile, fabless JamTech is in production with its JM2020 sub-ranging pulse-width-modulation (PWM)
Class D amp (Fig. 4). The analogy is to analog-to-digital converters (ADCs), where a sub-ranging
architecture employs a two-step approach.
In an 8-bit sub-ranging ADC, a first conversion would be completed with a 4-bit converter, and the result
of the 4-bit conversion would be converted back to an analog signal (with an 8-bit-accurate digital-toanalog
converter) and subtracted from the input signal, after which the result is again digitized to 4 bits.
Then, the results of the first and second pass are combined.
JamTech is the first company to offer a commercial product that applies a subranging technology to Class
D. The result is 16-bit audio quality with a 98-dB range of linearity, which ultimately provides accurate
sound reproduction at low signal levels. It also reduces zero-crossing distortion. The JM2020 comes in a
64-pin quad flat no-lead (QFN) package and costs $3.10 each in 1000-unit lots.
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Old 22nd November 2006, 11:52 PM   #46
Fin is offline Fin
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Being a Financial Adviser - I agree that things might not look good for Tripath.......but for DIYers it might be different. All T-Amps might become collectors items soon and appreciate in value.....
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Old 22nd November 2006, 11:58 PM   #47
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Quote:
Originally posted by Fin
Being a Financial Adviser - I agree that things might not look good for Tripath.......but for DIYers it might be different. All T-Amps might become collectors items soon and appreciate in value.....
I hope TI or NatSemi buys them out.

TI, especially. It's hard to beat their free samples program!

EDIT:

While I'm a little fuzzy on the legalese, it appears that Tripath has just been sued. However, sales are good.

http://phx.corporate-ir.net/phoenix....lar&id=903643&

As a result, the stock has dipped. However, I would invest in them - their products are very popular, it would seem, due to their high quality and ease of implementation. (They even have STK amps beat for the number of required parts!)
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Old 23rd November 2006, 12:02 AM   #48
Fin is offline Fin
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Quote:
Originally posted by Spasticteapot


I hope TI or NatSemi buys them out.

TI, especially. It's hard to beat their free samples program!
Now we KNOW that you are a cheapskate......
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Old 23rd November 2006, 12:12 AM   #49
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Quote:
Originally posted by Fin


Now we KNOW that you are a cheapskate......

The word is "student".

If anyone's interested in some inexpensive input caps, check the F/S/T forum. I bought a ton of WIMA 1.5uf MKP caps, and need to sell them so I can buy some Amp32 kits.

Sorry for the horn-tooting.
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Old 23rd November 2006, 12:18 AM   #50
Fin is offline Fin
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I was just kidding.....also have a few of their samples somewhere in my collection.

Thanks for the offer on the WIMA caps...but make it easy for us and put a link to the site/forum. I'm interested in a few. They would be just right for a T-Amp used with smallish speakers.
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