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Class D Switching Power Amplifiers and Power D/A conversion

L30D IRS2092 IRFB 4227  IRAUDAMP9 MYDIY
L30D IRS2092 IRFB 4227  IRAUDAMP9 MYDIY
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Old 6th January 2016, 05:57 PM   #11
Buehgemeiste is offline Buehgemeiste
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Join Date: Oct 2013
what is the minimum voltage?

will this be sold for a similar price like L15D or L25D?
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Old 6th January 2016, 06:31 PM   #12
Buehgemeiste is offline Buehgemeiste
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Join Date: Oct 2013
i looked L30D up on aliexpress and found this:
L30D/300 850W Single Channel Digital Finished Amplifier Board IRS2092 IRFB4227 IRAUDAMP9-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
is TZT an authorized seller?
the description says Vmin is +-60V.
how bad would +-50V be?
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Old 8th January 2016, 01:39 AM   #13
ljm_ljm is offline ljm_ljm  China
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Join Date: Sep 2006
Quote:
Originally Posted by Greg32 View Post
Hi Ljm, do you have a schematic for the l30d as i have bought 2 boards and they are not working well. frequency is around 200khz and loud audible oscillation on output. music is distorted and when turning volume up it cycles on and off about every 2seconds i have a scope and would love to to get them working properly. Greg
You can rest assured.
Each piece of L30D is through my careful testing can determine 100% no problem.
L30D only need to meet the voltage to meet the requirements on it. 70V + +, or about 75V.
Low voltage will not work.
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Old 8th January 2016, 01:44 AM   #14
ljm_ljm is offline ljm_ljm  China
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Join Date: Sep 2006
Quote:
Originally Posted by Buehgemeiste View Post
i looked L30D up on aliexpress and found this:
L30D/300 850W Single Channel Digital Finished Amplifier Board IRS2092 IRFB4227 IRAUDAMP9-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
is TZT an authorized seller?
the description says Vmin is +-60V.
how bad would +-50V be?
Below + -60 v will not work.

Recommended voltage + - 75 v.

It is very stable,
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Old 8th January 2016, 11:50 PM   #15
mgshightech is offline mgshightech
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Join Date: Nov 2012
iraud200 short story this board is similar and I scrapped with it a long time until it behaved. There may be some helpful info. there.
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Old 9th January 2016, 12:04 AM   #16
Greg32 is offline Greg32  Australia
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Join Date: Mar 2014
Location: Melbourne
Thank you mgshightech. this board is very unstable, i have had to adjust the feedback and the input is very sensitive to noise. Greg
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Old 9th January 2016, 03:42 PM   #17
ljm_ljm is offline ljm_ljm  China
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Join Date: Sep 2006
Quote:
Originally Posted by Greg32 View Post
Thank you mgshightech. this board is very unstable, i have had to adjust the feedback and the input is very sensitive to noise. Greg
L30D Very stable.

Using the + - 75 - v voltage.

And his voice is also very stable. Because I use it for a long time.

We don't need to study its design principle. Because a lot of people don't understand.

We simply know. It is very stable. Power is likely to be the largest in the digital power amplifier now.

And is actually to be able to use good voice. A lot of digital power amplifier, is only the theoretical value of outstanding.
Is not actually used. L30D is very good in actual use.

We only need to use the power is connected, do not need to be further study of it.
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Old 9th January 2016, 03:58 PM   #18
ljm_ljm is offline ljm_ljm  China
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Join Date: Sep 2006
Quote:
Originally Posted by mgshightech View Post
iraud200 short story this board is similar and I scrapped with it a long time until it behaved. There may be some helpful info. there.
I don't want to comment on this product. I just want to say, free send to me, I also don't want. Really.
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Old 10th January 2016, 02:53 AM   #19
Lo_Tse is offline Lo_Tse  Canada
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Join Date: Dec 2006
ljm,

Is LD30 listed on your TB shop?
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Old 10th January 2016, 04:48 AM   #20
ljm_ljm is offline ljm_ljm  China
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Join Date: Sep 2006
Quote:
Originally Posted by Lo_Tse View Post
ljm,

Is LD30 listed on your TB shop?
https://item.taobao.com/item.htm?spm...d=522731518819
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