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3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

Sebbou

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Dec 29, 2020
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Thanks again for all your answer I wont have to worry about putting it the wrong way.
Sad thing that I just seen is that the opa1656 is now on backorder for some month on mouser I guess I'l have to wait then :p
Again, the help was much appreciated it answered all my question. Thanks
 

AfterThought

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Referring to the data sheet:

A 6.8 nF capacitor with a 470 Ohm resistor (which is installed) for a 50 kHz corner frequency. With 10 nF we get 34 kHz.

I would install the 6.8 nF cap.

Why would you want a 50 kHz vs the lower 34?
 

molexey

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can not understand. DAC 96/24 to analog, then an amplifier, is it 48/24?
Because, together, together, because. :D

Why would you want a 50 kHz vs the lower 34?
Frequency response — 10 nF (20 kHz -1.3 dB)
Screen Shot 2021-01-20 at 20.23.32.png


Frequency response — 6.8 nF (20 kHz -0.7 dB)
Screen Shot 2021-01-20 at 20.40.36.png
 

molexey

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Sorry for my English...
In DSP, can I just use the equalizer or add something else?

I am interested in the effect of LOUD.
Please PM me. I will share a project with loudness.
 
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kino_eye

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Jan 20, 2021
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@3eaudio Any chance for a silver face version of DAP1002 and DAP2002?

Also, thank you for making the input sensitivity 1V. I agree that it is easier to reduce 2V to 1V than the other way around!
 

AfterThought

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While you are at it, its probably convenient to check the rail voltage of the opamps. Some of the opamps are rated to run nominally at 12V some are 15/16 V. I was wondering if the 5532 generating noise might be related to that ?

The amp supplies 12v (actually a hair under something around 11.9v) to the opamps.
 

Toku

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ok - i was wondering because some companies, selling at aliexpress get very good user reviews for their op amps
I don't know how to clearly distinguish between genuine and fake. However, it is strange to think that the price of the same OP amplifier is more than 5 times different. A good example is the price of OPA627. The price difference is about $1 to $15.
So I buy from expensive but reliable retailers. Mouser and Digikey are definitely real. Sometimes I buy it directly from TI's web shop.
Anyway, buying an op amp from China is like buying a lottery ticket.
 

barabashechka

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Jan 4, 2021
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Hello everybody, today when i turned on my DEP2002, device started blinking short lightning of all LEDs all the time. Nothing happens...
Did not found any information in manual. Maybe somebody knows about this? Is it an error o something?
Here is short video of it:
Thank you
 

Toku

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I checked the operation immediately after receiving the SY-DAP2002-4ohm that I ordered additionally today.
The noise issues reported in the forums are almost inaudible when you attach your ears to the speaker unit. It seems that the problem has already been improved with 3e audio. The OP amplifier prepared in advance for replacement is no longer in play.
The sound quality is as good as the previously purchased SY-DAP1002.
 

tifune

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Not so hard. Don't you have a friend able to help you?

I don't believe so, nobody in my social circle seems to know much about power supplies and their proper safety requirements.

Strangely, I received an email notification that had 2 links to Aiyama 3001 amps, which appear to be what I want, but the reply is not in this thread.

https://www.aiyima.com/collections/...amplifier-aiyima-a3001?variant=29384225554507

At first I ignored these because they're listed as 300Wx1 but now I see that's the same module at 4ohm.

That's probably the best choice for my needs, but I'm confused on the PSU Aiyama recommends.

https://www.aiyima.com/products/aiy...255-tda7498e-amplifier?variant=31623791378507

Is it normal for a PSU rated at 160W to be accompanied with a 300-480W amp? In my case, US 32V, if that matters
 

Toku

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I don't believe so, nobody in my social circle seems to know much about power supplies and their proper safety requirements.

Strangely, I received an email notification that had 2 links to Aiyama 3001 amps, which appear to be what I want, but the reply is not in this thread.

https://www.aiyima.com/collections/...amplifier-aiyima-a3001?variant=29384225554507

At first I ignored these because they're listed as 300Wx1 but now I see that's the same module at 4ohm.

That's probably the best choice for my needs, but I'm confused on the PSU Aiyama recommends.

https://www.aiyima.com/products/aiy...255-tda7498e-amplifier?variant=31623791378507

Is it normal for a PSU rated at 160W to be accompanied with a 300-480W amp? In my case, US 32V, if that matters
Most D-class amplifiers made in China display the maximum power listed on the spec sheet of the chip you are using, not the actual operating output power. You must first understand that.
The maximum working voltage of this AIYIMA amplifier is 35V. However, when observing the internal board, the withstand voltage of the power supply capacitor is 35V. Therefore, consider that the power supply voltage that can actually be used is about 32V. From the spec sheet of TPA3255, the output obtained at 32V is about 140W / 4Ω (10% distortion) and 115W / 4Ω (1% distortion), and 300W cannot be output. Therefore, the power adapter can be used with a capacity of about 150W.
 

dtn

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Dec 29, 2020
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Friends, can you check the assumption?
Yesterday I switched to 96khz in the project, and the speakers disappeared straight, the sound became in the depths of the stage and very clear.
I hope it's not in my head)
please check and tell me if there are changes and in which direction

(sorry if something is not clear, google translation)
 
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