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Very low MID-bass in TDA7293
Very low MID-bass in TDA7293
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Old 10th April 2021, 09:36 PM   #61
Astaro is offline Astaro  Russian Federation
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And mini version
"Velociraptor" -)))
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Old 11th April 2021, 06:47 PM   #62
chermann is offline chermann  Austria
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Old 13th April 2021, 12:09 PM   #63
Astaro is offline Astaro  Russian Federation
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Is everything clear that Google translator can translate in this article?
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Old 13th April 2021, 12:58 PM   #64
turion64 is offline turion64  United States
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Very low MID-bass in TDA7293
Quote:
Originally Posted by Astaro View Post
Is everything clear that Google translator can translate in this article?
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Itís definitely clearer than the original one, yes. The by-pass 0.1uF film caps mentioned should be placed on both the large 10,000uF & the subsequent 220-330uF caps or just the 10,000uF caps?

I think you should really give the builder the option to put an input blocking cap (0.47-2.2uF) on the board and not make them attach it to their input RCAs. My other preferences are 1) using two full wave bridge rectifier sets so we donít have to use a center-tapped transformer. At least here in the USA our options for toroidal transformer choice increases greatly if weíre allowed to use a dual secondary setup and 2) just design the board w/o itís own PS (therefore youíd only need a DC input (+, G, - )) and the builder could choose their own favorite PS arrangement...it would also give a little more room for the input dc blocking cap and the use of bigger diameter electrolytics around the board (like for Silmic IIs which always have a big diameter than their counter-parts).

Like you I have not greatly warmed to Class D amps yet. Class A, AB or regular chipamps (AB I guess) still sound better to me and have a greater ability to be sound-tailored by the use of traditional thru-hole components. Donít get me wrong about Class D, I have one from drMordor and itís wonderfully neutral and non-fatiguing to listen to it but I love the warmth of my LM3886 amp a bit more.

Regards, Pete
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Old 13th April 2021, 01:14 PM   #65
turion64 is offline turion64  United States
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Very low MID-bass in TDA7293
I have made an English translated PDF of the article if Astaro is agreeable to let me post it here.
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Old 13th April 2021, 01:37 PM   #66
chermann is offline chermann  Austria
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Quote:
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Is everything clear that Google translator can translate in this article?
DIY и Hi-Fi | Олег Привалов | Яндекс Дзен

yes. thanks you Astaro. i tried some chapters and it worked well from Russia to English
really nice done.


i agree to:
My other preferences are 1) using two full wave bridge rectifier sets so we donít have to use a center-tapped transformer.
its really not easy to get a center taped transformer.


chris
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Old 13th April 2021, 07:59 PM   #67
Astaro is offline Astaro  Russian Federation
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1. The 0.1u bypass film caps must be placed as close to the consumer (tda7293) as possible.

2.Are you writing about the possibility of making such a power supply unit as in picture 1? And what is its superiority over picture 2 (just connect the two windings correctly)?
3. And of course, I will only be grateful if you translate the article well and correctly. You can post the translation of the article wherever you want!
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Old 13th April 2021, 11:52 PM   #68
turion64 is offline turion64  United States
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Quote:
Originally Posted by Astaro View Post
1. The 0.1u bypass film caps must be placed as close to the consumer (tda7293) as possible.
Ok, thanks

Quote:
Originally Posted by Astaro View Post
2.Are you writing about the possibility of making such a power supply unit as in picture 1? And what is its superiority over picture 2 (just connect the two windings correctly)?
Yes, as in picture 1. There is nothing electronically superior about 1 vs 2. Many of us canít find center tapped toroidals to use for projects that demand them. For instance, to power your two amp boards I needed to get a 300VA with 12+12 secondary outputs so, when connected correctly one gets ~24VAC (or 24BAC in Russian translation?) with a center tap line, so ~ +/- 34VDC with a center tap. Well a 300VA toroidal that has 12+12 secondaries is 12A. Itís huge and itís really hard to find a smaller one with 12+12 secondaries that would be good to run the two 7293 boards with good power. Giving us a PS like #1 would let us use as smaller (and smaller amperage) toroidal. A lot of other designers have gone this direction.

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Originally Posted by Astaro View Post

3. And of course, I will only be grateful if you translate the article well and correctly. You can post the translation of the article wherever you want!
I will read it over carefully before posting but itís just cut-n-pasted from how Google Chrome translated it.

Regards,

Pete
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