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Old 1st October 2011, 08:49 PM   #1011
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by Lazy Cat View Post
Here it is, SSA suitable to drive yours low Z speakers.

I suggest you to built two monoblocks solid as a rock and please provide good and fast thermal dissipation.

The worst output BJT SOA case is at 25 V output voltage on 1 ohm impedance, resulting in 625 W power dissipation on 6 outputs (104 W per one BJT) which is managable with a good heatsinking.

Regards Andrej


Hello LC,

Can the outputs be substituted with MJW3281A/MJW1302A..


Regards,
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Old 1st October 2011, 09:24 PM   #1012
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Yes of course, as long as you matched them to hFEmin=100 evenly, so each BJT will flow exactly 1/6 of the output current. These all are based on Toshiba plastic power transistors, very popular ones, so be careful not to buy some sort of fakes.
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Old 1st October 2011, 09:53 PM   #1013
wahab is offline wahab  Algeria
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Quote:
Originally Posted by Lazy Cat View Post
Here it is, SSA suitable to drive yours low Z speakers.

I suggest you to built two monoblocks solid as a rock and please provide good and fast thermal dissipation.

The worst output BJT SOA case is at 25 V output voltage on 1 ohm impedance, resulting in 625 W power dissipation on 6 outputs (104 W per one BJT) which is managable with a good heatsinking.

Regards Andrej
That s a lot of transistors according to this poster :

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Originally Posted by Lazy Cat View Post
Nooooo, too many transistors according to thread theme.

Besides this is not somewhat Joachim meant. Check my last sch, DRAIN output ...
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Old 1st October 2011, 10:35 PM   #1014
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Quote:
Originally Posted by wahab View Post
That s a lot of transistors according to this poster
... and keeps growing
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Old 1st October 2011, 10:47 PM   #1015
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Quote:
Originally Posted by Lazy Cat View Post
Yes of course, as long as you matched them to hFEmin=100 evenly, so each BJT will flow exactly 1/6 of the output current. These all are based on Toshiba plastic power transistors, very popular ones, so be careful not to buy some sort of fakes.
Hi Lazy Cat,

Could you show us you jig or schematic in measuring hFE of the Power transistors?
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Old 1st October 2011, 11:50 PM   #1016
a.wayne is offline a.wayne  United States
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Originally Posted by wahab View Post
That s a lot of transistors according to this poster :


well it's a V12 .......... ...
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Old 2nd October 2011, 07:29 AM   #1017
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Default My protection circuit principle

For Lazy Cat:
http://www.diyaudio.com/forums/digit...ml#post2731758
__________________
Ultimate Protection and more.The Only Source of Knowledge is experience, everything else is just information” ©A. Einstein
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Old 2nd October 2011, 08:19 AM   #1018
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Exclamation SSA Balanced Low Impedance HP

Quote:
Originally Posted by Smiley 09 View Post
Lazy Cat,

Thank You for the SSA V-12.
A masterpiece of its own .
Please, can You add the dedicated Balanced Input stage to this particular design that will make this SSA-V12 best of IT. . ...
I just couldn't resist to this request.
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File Type: jpg SSA Balanced Low Impedance HP.jpg (847.2 KB, 861 views)
File Type: jpg SSA Low Impedance HP PSU.jpg (621.9 KB, 785 views)
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Old 2nd October 2011, 09:13 AM   #1019
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Quote:
Originally Posted by fredlock View Post
Hi Lazy Cat,

Could you show us you jig or schematic in measuring hFE of the Power transistors?
Hi fredlock

You can use multimeter with hFE function which calculates hFE=Ic/Ib at Ic=1mA.

If you don't have such meter than you can use attached schematic.
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File Type: jpg NPN-PNP Bias Matching.jpg (225.3 KB, 669 views)
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Old 2nd October 2011, 10:40 AM   #1020
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Default The Beautiest V-12 Masterpiece

Dear Mr. Andrej

Thank You very much for the most beautiful SSA-V12 version.
You make me the beautiest day since long time awaiting for something to drive my speakers civilized - and You make it.
I know, this is the most Generous Scorpio's gift, You give to the whole worldwide sound-lovers & audio community. Thank You ...

Long Live & let God bless You . .

Andreas
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