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Old 31st May 2010, 08:41 AM   #1
yakideo is offline yakideo  Poland
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Default Tripath TA2022 amp

Hi,

I'm thinging of building a amp based on the tripath ta2022 90W chip. I want to use a AC-to-DC adapter as the power source. What is the easiest way to achieve the minus voltage required by the chip?

Is the pga2310 good for volume control?
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Old 31st May 2010, 04:40 PM   #2
gootee is offline gootee  United States
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You might want to ask a moderator to have your post moved to the Class D area, where Tripath amplifiers are discussed.

If you are thinking 90 Watts, then your "AC-to-DC adapter" would probably need to be a real "power supply". When I see "AC-to-DC adapter", it makes me think of wall warts.

But there are some products labeled as "AC-to-DC adapter" that are more like a laptop power supply, which are in a larger case and don't hang directly on the wall outlet. I think that they are available with both positive and negative DC outputs.

Also available are "bare" power supply modules that would probably be suitable for mounting inside your amplifier's cabinet.

Some power supplies are switch-mode (SMPS) and some are linear types (transformer/rectifier bridge(s)/smoothing capacitors).

The SMPS types usually have high-frequency noise/ripple in their outputs, which you might need to filter out. Amd the linear types usually have low-frequency noise/ripple on their outputs, usually at twice the AC power line's frequency, which you could also filter and regulate out, mostly. But often, you don't have to care about the noise/ripple.

So you could buy an AC-input power supply that has both positive and negative DC voltage outputs. You didn't say what voltages are needed. But places like mouser.com show lots and lots of AC-to-DC power supplies available.

Or you could very-easily build a dual-polarity linear power supply, with or without regulators. There are many, many schematics and threads about them, here on diyaudio.com. They are very simple, and can have very few parts.
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Old 31st May 2010, 11:58 PM   #3
yakideo is offline yakideo  Poland
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I was indeed thinking of laptop power supplies. For a 90W amp I need a power supply that will deliver 90W, right? Maybe I'm better of putting the power supply into the amp cabinet. The voltages needed for the tripath are 5V for the logic and +-31V (min. +-12V, max +-36V). I was thinking of running it of a 12V supply but maybe that's really stupid, dunno.
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Old 1st June 2010, 01:52 AM   #4
gootee is offline gootee  United States
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Hi Yakideo,

I am not familiar with that chip. But I would guess that for the full 90W capability, something between the +/-31v and +/-36v would be needed. But I could be wrong. You would need to take into account the specs for max output current versus supply voltage (or some similar spec) and the impedance of the load.

Also, for an amplifier with a 90W output capability, assuming that means 90 Watts _average_ power output, you would probably want a power supply that is larger than 90 Watts. Depending on how the circuit is designed, you might even want several times 90 Watts for the supply.

If it were me, I would post a question about that over in the Class D forum, where there are people who are already familiar with the chip and the type of amplifier you are considering. And I am sure that there are also already threads where all of this has been asked and answered, over there (which you should probably find and read before posting).

I would also go to the manufacturer's website and get the Application Notes related to the chip, and maybe also those for similar chips, and also get the official Datasheet for the chip. All of your answers should be there, along with even more questions, and their answers too, and schematics, recommendations, etc.

Cheers,

Tom
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Old 1st June 2010, 04:47 AM   #5
col is offline col  Australia
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have a look at the 41hz amp9-basic. It is 4 x 100W and is single ended. I have successfully run one of these off of a 12-24v DC-DC laptop supply from a car battery.

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Old 1st June 2010, 01:50 PM   #6
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I cannot understand the issue of the threadstarter as well as he supposed to ...

If I am not wrong the TA2022 is more powerful and a bit more difficult to integrate in shematics than the other Tripaths. On the other hand he still seems to have open questions regarding the elemantar parts of the amp like the powersupply.
An he obviously cleared this question in using a laptop PS
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Old 2nd June 2010, 10:53 PM   #7
yakideo is offline yakideo  Poland
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Quote:
Originally Posted by TheDealer View Post
I cannot understand the issue of the threadstarter as well as he supposed to ...

If I am not wrong the TA2022 is more powerful and a bit more difficult to integrate in shematics than the other Tripaths. On the other hand he still seems to have open questions regarding the elemantar parts of the amp like the powersupply.
An he obviously cleared this question in using a laptop PS
I had a hard time deciding with tripath amp to go for. The TA2022 is a nice one but I came to the conclusion that it has a bit to much power (atleast right now). I think a TA2020 will have enough power to fill my little room.

Now that I have decided with amp to use can any one tell me how the good the bass is on the TA2020. If I would want to connect a sub woofer how is the best way to connect it to the amp?

As I understood it the audio quality also depends on the surrounding components, filtering caps etc, any tips on which ones to choose?

Sorry for the topic confusion.
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Old 3rd June 2010, 12:33 AM   #8
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Take the Mk III TA2020 board from Arjen Helder. You cannot go wrong with it.
A sub-out design on the board would be not recommended I think. Itīs not the cup of every DIY. So if you insist on connection to a subwoofer then take a an active sub where you lead the speaker cables into it and from there to your speakers ...

BTW: the bass you will get depends on the room size and your speakers.
The TA2020 with itīs 10 Watts/channel could be in one case enough and in other case not enough. A good subwoofer could be solution but hard to integrate well in a system.
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Old 3rd June 2010, 12:57 AM   #9
yakideo is offline yakideo  Poland
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Quote:
Originally Posted by TheDealer View Post
Take the Mk III TA2020 board from Arjen Helder. You cannot go wrong with it.
A sub-out design on the board would be not recommended I think. Itīs not the cup of every DIY. So if you insist on connection to a subwoofer then take a an active sub where you lead the speaker cables into it and from there to your speakers ...

BTW: the bass you will get depends on the room size and your speakers.
The TA2020 with itīs 10 Watts/channel could be in one case enough and in other case not enough. A good subwoofer could be solution but hard to integrate well in a system.
Actuality I was thinking of doing my own board. What about just splitting the line-in input inside the amp and connect a powered sub?
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Old 3rd June 2010, 07:16 AM   #10
chaparK is offline chaparK  Luxembourg
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Tripath chips are usually 2-channel.

The spec of TA2022 is 90W per channel, so 180W in total.

Efficiency is about 0.85 at max output power, so the TA2022 alone will need 180/.85 = 211W.

Then you'll need some extra power for the 5V stage, the bits and chips all around that are heating up the atmosphere.

All in all a 300W power supply is not a crazy choice if you want to use the TA2022 at full capabilities.

Note that max power is obtained with the highest rail supply. The TA2022 has the following limits: +/- 31V if your load is 4 ohms, +/- 35V if your load is 8 ohms.

It's not going to be easy to find a switched power supply with +/-31V or +/- 35V...

The TA2020 has lower power supply requirements. It's happy with a single output supply, and 14V is about the max. Expect about 20W max per channel under 4 ohms.

If you repeat the procedure above you'll find out that +14V 60/70W is about the optimal supply for a TA2020.

Best luck with your design!

chaparK
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