Sure Electronics New Tripath Board tc2000+tp2050 - Page 82

Ouroboros · 8th December 2009, 07:02 AM

For the filters and Zobels on the output stage, you're best to go to the ST Micro web site and download the data sheet for the STA505. The Tripath output chip is simply a re-branded ST505.

Alastair E · 8th December 2009, 10:31 AM

Quote:

Originally Posted by MikeHunt79

Hi, where is that quote from? I cannot find any mention of Schottky diodes in the Tk2050 datasheet or the Sure manual... This amp does not use the TA2020 chip like the Lepai does however!

Hi Mike...

I was asking, as I know there was an issue with the 2020, and as the format is very nearly the same as to the O/P stage MOSFETS and RF Filter-stages, it could also be subseptible to the same 'mode of damage' that the 2020 suffered from when the supply was near its maximum and 'difficult' loads were driven.

--A few years ago, on the Tripath website, (Long since gone....) there was a single leaf about the overshoot protection using the diodes....

MikeHunt79 · 8th December 2009, 05:27 PM

Quote:

Originally Posted by Alastair E

Hi Mike...

I was asking, as I know there was an issue with the 2020, and as the format is very nearly the same as to the O/P stage MOSFETS and RF Filter-stages, it could also be subseptible to the same 'mode of damage' that the 2020 suffered from when the supply was near its maximum and 'difficult' loads were driven.

--A few years ago, on the Tripath website, (Long since gone....) there was a single leaf about the overshoot protection using the diodes....

I think this information about overshoot protection using the diodes is within the TA2020 datasheet, that's where I remember reading it and also seeing 8 diodes on the schematic.

I do not think this amp needs these diodes, and even if it does, you can play it safe and feed it 32v or less.

Alastair E · 8th December 2009, 06:15 PM

Fair enough....

They are cheap enough to play around with anyway...

Ive been looking at the 4 ch. version. Any comments on this one in particular?

e_fortier · 8th December 2009, 11:45 PM

Hi,

I just bought last night a second 2 x 100W, these are pretty good.

What are you guys using for the output caps keeping in minds that I will keep the present output coils (22uH shielded type)

What I'm looking for is the value for C33, C36, C35 and also the value for the Zobel, I am aware that it is a matter of compromise but please suggest values that have given you great sounds. A while back at the beginning of this thread someone had suggest great result with 0.22uF Polyester Film cap so I already bought 20 of them, I hope I can use them

Thanks for your help.
Eric

sendler · 9th December 2009, 02:28 AM

Quote:

Originally Posted by Alastair E

Fair enough....

They are cheap enough to play around with anyway...

Ive been looking at the 4 ch. version. Any comments on this one in particular?

Lots of problems.
Sure Electronics New Tripath Board 4*100W class-D Amplifier Board

sendler · 9th December 2009, 02:58 AM

Quote:

Originally Posted by MikeHunt79

I guess Belden is the yardstick here, and it is good that it is available both sides of the Atlantic. Am I right in assuming Belden magnet wire has red insulation?

Belden makes both types. Solder strip and high temp which must be scraped. My cheap stuff is solder strip and the Belden is high temp and has a darker red color.

Quote:

I can use the internal gains of the DCX to achieve -10Db of attenuation without any problems.

Keep digital attenuation as close to zero as possible for the best resolution.

Quote:

By the looks of the schematic, could a pot be used in place of R14/R34?

I haven't tried it yet because stepped attenuators can click once in a while and the TC2000 are fragile to input spikes but removing R14/34 should be a good idea if adding a volume control. The input impedance of the amp will increase from 11k to 22k and work better with the passive control. Stepped volume control is a must have in a DCX active cross setup so all of the channels can be turned up and down the same number of clicks and stay synched.

Quote:

I'm using a 20k pot right now, and it works fine. I guess a 10k should be ok also.

With the volume control right on the board, minimal/none wire between it and the next active stage, you might get away with 20k. No way to tell which value might sound best but to listen. Higher values are an easier load for your source/DCX. Lower values have lower output impedances which interact with any following wire less.

pheonix358 · 9th December 2009, 03:10 AM

Quote:

Originally Posted by Alastair E

Fair enough....

They are cheap enough to play around with anyway...

Ive been looking at the 4 ch. version. Any comments on this one in particular?

My first one fried, second one is fine, no problems. Sounds great right out the box. Sure are good about replacing them. They seem to fry or not. Some bugs have been fixed and the new ones seem to work.

Terry

pelayostyle · 9th December 2009, 04:55 AM

Hi Guys,
I'm in the process of building the output filter from the tripath data-sheet. Im not quite sure where the ground leads for the output capacitors go. Im using a separate breadboard that will be held in place by screws.

RobFreak · 9th December 2009, 07:48 AM

I think i overlooked something. The 4x100W 4Ohm amp. is already bridged, so its not possible to use my 120W 8Ohm speakers at max. performance?

8th December 2009, 06:15 PM	#814
Alastair E diyAudio Member Join Date: Feb 2004 Location: South Wales	Fair enough.... They are cheap enough to play around with anyway... Ive been looking at the 4 ch. version. Any comments on this one in particular? __________________ Das Beste Oder Nichts

8th December 2009, 11:45 PM	#815
e_fortier diyAudio Member Join Date: May 2001 Location: Twilight zone	What value for output caps and Zobel Hi, I just bought last night a second 2 x 100W, these are pretty good. What are you guys using for the output caps keeping in minds that I will keep the present output coils (22uH shielded type) What I'm looking for is the value for C33, C36, C35 and also the value for the Zobel, I am aware that it is a matter of compromise but please suggest values that have given you great sounds. A while back at the beginning of this thread someone had suggest great result with 0.22uF Polyester Film cap so I already bought 20 of them, I hope I can use them Thanks for your help. Eric

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8th December 2009, 07:02 AM	#811
Ouroboros diyAudio Member Join Date: Dec 2003 Location: Nottingham UK	For the filters and Zobels on the output stage, you're best to go to the ST Micro web site and download the data sheet for the STA505. The Tripath output chip is simply a re-branded ST505.

9th December 2009, 04:55 AM	#819
pelayostyle diyAudio Member Join Date: Jan 2006 Location: los angeles	Hi Guys, I'm in the process of building the output filter from the tripath data-sheet. Im not quite sure where the ground leads for the output capacitors go. Im using a separate breadboard that will be held in place by screws.

9th December 2009, 07:48 AM	#820
RobFreak diyAudio Member Join Date: Dec 2009	I think i overlooked something. The 4x100W 4Ohm amp. is already bridged, so its not possible to use my 120W 8Ohm speakers at max. performance?