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Old 29th July 2005, 09:33 PM   #11
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This idea is not even crazy enough.
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Old 29th July 2005, 09:47 PM   #12
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sa:

...but powerwise not really satisfying? Right?


mzzj:
"base current suckout" ?
Sorry, I never observed something like this.
But if the Ube of your transistors were quite different, and
you tried to bias with low voltage drops across the emitter
resistors it could look like like this.....
The BJTs with low Ube will carry the idle current while the others are
still passive. When paralleling BJTs you should select for identical
Ube, or work with with high values of emitter resistors.
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Old 29th July 2005, 09:52 PM   #13
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Default Cheers Chocoholic, this trap was directed to you.

You was fished me dear friend.

One Chocolat Strudel to you and a glass of wine, my dear old friend.

Cheers for her also!

Carlos
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Old 29th July 2005, 09:53 PM   #14
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more detailed:
you should select for identical Ube while running at a
defined collector current and Uce above 5V......
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Old 29th July 2005, 10:00 PM   #15
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Cheers Carlos !

...unfortunately the smilies don't offer a glass of wine...
Well, this will do the job




BTW:
"Cheers for HER also !"
???
Ähem, you win.
Only a lady can keep me from hanging around in this forum...
....and you noticed that...
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Old 29th July 2005, 10:22 PM   #16
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Default Yeah Choco, you are rigth, and i feel good reading all that knowledge.

Yeahh!.... you can capture.... very nice.

And my daugther lonely.... pretty girl, sad.... alike a ship encraved in a sand bank...so good girl she is.

And a lot of handsome single guys in our forum.... oh!..life is not fair.

Cheers,

Carlos
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Old 29th July 2005, 10:49 PM   #17
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This time from my side:
Cheers for her also !
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Old 30th July 2005, 10:42 AM   #18
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Hi Carlos ,

Your daughter is very pretty and her eyes are like jewel just like yours..brazilians are good in nature and ofcourse in beautifulness......

cheers Carlos,
K a n w a r
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Old 30th July 2005, 02:26 PM   #19
mzzj is offline mzzj  Finland
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Quote:
Originally posted by ChocoHolic



mzzj:
"base current suckout" ?
Sorry, I never observed something like this.
But if the Ube of your transistors were quite different, and
you tried to bias with low voltage drops across the emitter
resistors it could look like like this.....
The BJTs with low Ube will carry the idle current while the others are
still passive. When paralleling BJTs you should select for identical
Ube, or work with with high values of emitter resistors.
in order to turn-off BJT faster it is usefull to reverse-bias base-emitter junction to "suckout" base charge. I Thought that it may be the reason to my output stage's strange behaviour biased vs. unbiased case. Dunno, maybe i should start new thread about sucking the base out...
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Old 30th July 2005, 06:58 PM   #20
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....you mean that you had issues with the storage time
of your BJTs... ?
Ok, storage time has heavy tolerances, but I would not expect
trouble with this when you use a BC327 in linear mode (not switched to saturation) at HiFi frequencies....

any scope pics or description of the effects that you had observed?
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