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Old 14th April 2005, 12:53 AM   #21
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Hi Kanwar,

Yes driving these individually in a voltage gain stage to minimize losses is the way to go to max the power efficiency.

A word of caution - although the SOAR is awesome and the devices are no doubt very rugged, the duration is very small and the case is 25C. You admit to 50C days before the amp is powered up! What's the 1 second curve - same derating as the previous two?

Set up in an amplifier at 80V rails the pkg allows about 5A at zero crossing . That's at case of 25C and continuous. You're opting for 75C and the pulsed region to drive reactive loads. I usually design for driving an 8 ohm load of any phase angle. Then -

Supply Voltage/8 = 10 amps so it should be capable of 10 amps at zero crossing. Therefore 2 devices per half (2 upper/2 lower)

But, hey, you have a shipload of them and are extracting more so good for you if their that rugged and reliable.

For a Hi End amp you would want to lower the THD at 20KHz significantly and that would be quite difficult with such slow devices. Good for Workhorse PA though. For better sound you could biamp with a smaller more agile refined amp for the top.
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Old 14th April 2005, 01:47 AM   #22
mikeks is offline mikeks  United Kingdom
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http://www.diyaudio.com/forums/showt...564#post585564
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Old 14th April 2005, 01:54 AM   #23
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...5564#post585564.

what's that mean?
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Old 14th April 2005, 01:56 AM   #24
mikeks is offline mikeks  United Kingdom
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left-click on it...it's a link...
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Old 14th April 2005, 02:37 AM   #25
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Duh! I couldn't find anything with a number 585564. To what post are you referring.
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Old 14th April 2005, 02:44 AM   #26
mikeks is offline mikeks  United Kingdom
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Duh...indeed...

Place your mouse cursor directly above this:

http://www.diyaudio.com/forums/showt...564#post585564

...and Left-click!!
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Old 14th April 2005, 03:24 AM   #27
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How not to communicate in English.

Mikeks,

When I open the link AND expand it to full screen there are 3 posts none bearing any reference numbers 585564, so to which one specifically are you referring and why?

I have no idea as all you posted was a link . In response to what?
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Old 14th April 2005, 03:57 AM   #28
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guru,

#whatever in a URL means that "whatever" is the name of a tag in the HTML source. It's simply used as a reference or bookmark of sorts for a position on a page. If you mouseover one of the "Post #foo" links in the top right of any thread post, you will see something like the #post585564 which simply means scroll down to the tag named "post585564" on the page mikeks linked to. So click his link, and whatever is at the top is whatever he wanted to share.
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Old 14th April 2005, 05:25 AM   #29
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MtBiker,


I found it! I right clicked the mouse and opened properties and there was the 6 digit number! Why would I know that.


Why couldn't he say Post 13 ? how obscure.
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Old 14th April 2005, 06:32 AM   #30
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Hi, Kanwar,

I also seduced by using only 1 big transistor instead of parrarel smaller ones. A commercial amp (Gamut) has also use this idea.
But since those big transistors usually are Nch, this will direct us to quasi complementary topology. Do you also use this topology?

Gamut uses industrial mosfet. I haven't heard audio power amp using industrial IGBT (JLH uses audio IGBT/complementary N+P. The industrial IGBT modules are different nature and BIG SIZE indeed) Maybe your product will pioneer the use of it in audio amps?

How is the sound result? Is it different sound than using bipolar or mosfet?
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