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Old 20th November 2011, 02:43 PM   #961
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Quote:
Originally Posted by actinium View Post
just got the t2020+..

i read the last 10 pages for at least 10 times already..

order the capacitors according to XtremeRevolution.
any recommendations for the op amp??

whats the differences between changing them and bypassing them?
if bypassing, is it bypassing 1 or both of them??
if changing, what is a good choice??
Hello

By doing the bypass I posted for the ta2020a+ you are disconnecting the input signal from the tone, volume control and two op amps.
You are essentially comming from the input then r36, r37,r35 ,r34 to coupling cap then r8, r10, r9, r11 to IC TA2020 pins 9, 10, 11, 13.
As you can see on the pic of my post I even removed the caps from the op amps circuit. That means op amps have no power and are just sitting there, not being feed and not connected.

I think you can and must use 2.2uf mkp instead of electrolytic 1.75uf,
I have had only used the 1.75uf because I don't have 2.2uf caps right now. If you want your lepai to be more like the tripath suggested circuit you can also replace the resitors on r37,r36, r35, r34, r8, r10, r9, r11 and them go to the inductors, output caps etc.

[]'s
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Old 20th November 2011, 03:09 PM   #962
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I just bought a new one for mine on ebay, 5.5USD shipped to finland.
Link: IC TRIPATH ZIP-32 TA2020 TA2020-020 | eBay
You have to message the seller that you want the ta2020-020 specifically.
Mine died from "trying how loud I could go" Before it had just clicked off and clicked back on when the volume was at a sane level but this time it didn't
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Old 20th November 2011, 03:32 PM   #963
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Bellow I edited the tripath schem. The values in red are not confirmed and are based on what is printed on the TA2020a+ components.

Click the image to open in full size.

http://www.e-ele.net/DataSheet/TA2020.pdf
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Old 20th November 2011, 03:32 PM   #964
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Any Idea How to check whether the chip is still alive or not ? simple method will be fine.. Thanks
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Old 20th November 2011, 03:53 PM   #965
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Quote:
As you can see on the pic of my post I even removed the caps from the op amps circuit. That means op amps have no power and are just sitting there, not being feed and not connected.
This seems like a questionable statement. Removing the capacitors does not remove the power from the op amps.
Quote:
Any Idea How to check whether the chip is still alive or not ? simple method will be fine.. Thanks
Confirm that the TA2020 chip is getting power, confirm it isn't in mute or sleep mode, inject an audio signal to the left then right inputs.
The inputs at the chip, not at the back of the unit.
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Last edited by sofaspud; 20th November 2011 at 04:06 PM.
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Old 20th November 2011, 05:33 PM   #966
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Quote:
Originally Posted by sofaspud View Post
This seems like a questionable statement. Removing the capacitors does not remove the power from the op amps.
Hello
I'm just a noob here and i'm trying to find awsners to the questions concerning the TA2020A+. Questions that have been already asked many times but not answered . I think bypass =no signal + no caps=no power

That way I would appreciate if you could point out exactly were from is this power/signal comming from ?

[]'s

Last edited by Virpz; 20th November 2011 at 05:52 PM.
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Old 20th November 2011, 06:30 PM   #967
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Quote:
Originally Posted by Virpz View Post
...

I think you can and must use 2.2uf mkp instead of electrolytic 1.75uf,
I have had only used the 1.75uf because I don't have 2.2uf caps right now. If you want your lepai to be more like the tripath suggested circuit you can also replace the resitors on r37,r36, r35, r34, r8, r10, r9, r11 and them go to the inductors, output caps etc.

[]'s
2.2 uF, really? That is what Tripath recommended?
Good to know. I put the original electrolytics back so I could close the box, but I retained your bypass. I will try to get some better caps on my next parts order.
Thanks.
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Old 20th November 2011, 07:42 PM   #968
frasco is offline frasco  Finland
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While waiting for the parts to arrive to my own TA2020-based design I just ordered a Lepai to use as reference.
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Old 20th November 2011, 08:08 PM   #969
htgeek is offline htgeek  United States
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Anybody knows how to add the OVERLOADB indicator? In the datasheet appears this:

Overload
The OVERLOADB pin is a 5V logic output. When low, it indicates that the level of the input signal has overloaded the amplifier resulting in increased distortion at the output. The OVERLOADB signal can be used to control a distortion indicator light or LED through a simple buffer circuit.

What kind of buffer circuit does it refer to?
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Old 20th November 2011, 09:22 PM   #970
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Quote:
Originally Posted by Skywave-Rider View Post
2.2 uF, really? That is what Tripath recommended?
Good to know. I put the original electrolytics back so I could close the box, but I retained your bypass. I will try to get some better caps on my next parts order.
Thanks.
Yes, 2.2uf.
I purchased mundorf 2.2uf mcaps 400v 3% that I hope to be delivered sometime during next week along with tk2050 boards.

Replying to your previous post I think the TA2020A signal goes to vol> op amp1>tone controls > op amp2 > ta2020 pins 9, 10, 12 ,12. From there the schematic is pretty much the same on all the versions.

http://www.e-ele.net/DataSheet/TA2020.pdf

Good luck to all of us

Last edited by Virpz; 20th November 2011 at 09:26 PM.
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