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Class D Switching Power Amplifiers and Power D/A conversion

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Old 14th January 2010, 02:01 AM   #21
authlxl is offline authlxl  China
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Default tda8954

I believe smsp and amp in one board design difficult but use easily,my friends told me you have to think about DIY,they always like do it youself,so i design other board for him.
this board i have used in product 2007,use tda8920.it's strong structure.so i change pcb route fit for tda8954.
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Old 14th January 2010, 05:10 AM   #22
Pano is offline Pano  United States
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authlxl - are you planning to share the circuit designs with the forum, or are these just something you plan to sell?

If you are just showing these as something you plan to sell, you might be better off posting in the vendors forums.

Cheers!
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Old 14th January 2010, 06:11 AM   #23
authlxl is offline authlxl  China
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Ok ,goog suggestion,please look my tda8954 and smps schematic ,if you have another suggestion,send me mail.
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Old 22nd January 2010, 08:33 AM   #24
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Quote:
Originally Posted by Bearman View Post
I can safely say that CNX's TDA8920 amps sound very good. I have several of them. The NXP chips seem to have a much better bass, when the Tripath chips seem to lack a bit.
Can you tell me what to do with the middle input pin (pin 3 - Mode pin)
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Old 22nd January 2010, 08:48 AM   #25
Eva is offline Eva  Spain
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These ICs use pre-filter feedback and thus they exhibit load dependent high frequency peaking, so I wouldn't consider them very "hi-fi". Otherwise, they include many interesting protections and features.
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Old 22nd January 2010, 08:55 AM   #26
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These ICs use pre-filter feedback and thus they exhibit load dependent high frequency peaking, so I wouldn't consider them very "hi-fi". Otherwise, they include many interesting protections and features.
Have you heard them? Many analogue contructors also claim that, amplifiers with feedback is also not very hifi, but not all agreeand some amplifiers actuallu sound great even with global feedback.

I will come back with impressions when mine have been finished. I don't hope for high end sound, just good enough for the price. I will have a 4*60 watt 8 ohm amplifier with two 300 watt toroidal transformators for around 250$ incl. cabinet (actually cheaper because I have som stuff in my drawer). This also includes danish VAT and import taxes. It would be only 200$ wo theses taxes.

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Old 22nd January 2010, 09:07 AM   #27
Eva is offline Eva  Spain
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Sorry but you sound as if you hadn't a clue of what pre-filter and post-filter feedback is on class D amplifiers.
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Old 22nd January 2010, 09:17 AM   #28
authlxl is offline authlxl  China
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I also believe TDA8920 sound better than TRIPATH IC,good low frequency,nice high frequency.but normal state need 100ma current is short.I have test many times,tda8920BJ sound better than tda8920bth.
I have some tda8920BJ ,if anyone need I can get one pcs for you as present.

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Old 22nd January 2010, 09:17 AM   #29
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Sorry but you sound as if you hadn't a clue of what pre-filter and post-filter feedback is on class D amplifiers.
I know that most info I can get recommend post-filter (or a combination of feedback as in ICEpower and TC electronics modules), but I also know some who have tried 892X chips, and find the sound more than satisfying - especially in the bass region. Maybe they are hifi for bass purposes? Only a test will show (for me). I will compare with Panasonic SA-XR50.
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Old 22nd January 2010, 09:18 AM   #30
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Originally Posted by Kjeldsen View Post
I know that most info I can get recommend post-filter (or a combination of feedback as in ICEpower and TC electronics modules), but I also know some who have tried 892X chips, and find the sound more than satisfying - especially in the bass region. Maybe they are hifi for bass purposes? Only a test will show (for me). I will compare with Panasonic SA-XR50.
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