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Old 8th October 2011, 09:59 PM   #241
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Dzius View Post
Just for another confirmation. On the BOM list of BA-3 front end I found:

Q3 N-Channel MOSFET Output 2SK2013
Q4 N-Channel MOSFET Output 2SJ313
so I'm little bit confused. First 2SJ313 is P chanel type. .
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Old 8th October 2011, 10:05 PM   #242
tinitus is offline tinitus  Europe
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actually I think there is a typing error in the BA3 driver board BOM

I guess Q3 should be SJ313, P-channel
and Q4 SK2013, N-channel

fairchild replacement devices seems reversed too
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Old 8th October 2011, 10:15 PM   #243
generg is online now generg  Germany
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Yes Juma, you are right........

F4 was in my head!

F5 and BA-3 have p and n types just opposite!

I only can apologize ........!!!
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Old 8th October 2011, 10:27 PM   #244
Zen Mod is offline Zen Mod  Serbia
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naah ......

do not worry ........

what's little smoke , between friends .......



(disclaimer - as long someone is still sane in our musings )

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Old 8th October 2011, 10:28 PM   #245
generg is online now generg  Germany
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Quote:
Originally Posted by generg View Post
Q4 is SJ and Q3 is SK

compare with F5 for instance or BA-2 the p is connected with negative rail, the n with positive rail....
@Dzius

Take care! I was wrong, mixing up F4 and F5!
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Old 8th October 2011, 11:10 PM   #246
juma is offline juma  Serbia
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Quote:
Originally Posted by generg View Post
...

F5 and BA-3 have p and n types just opposite!

...
You're killing me !

It's all in the F5 article - common Source, common Drain, common Gate topologies, explanations and drawings...

Just remember that every FET with 2SJ prefix is a P-channel and every 2SK is a N-channel device.

Few simple things more:
- every N-ch device has its Drain more positive than the Source in order to work
- N-ch depletion mode device (f.e. JFET, like 2sk170) will not conduct the current only if its Source is far more positive than its Gate
- N-ch enhanced mode device (f.e. HEXFET, like IRF610) will conduct the current only if its Gate is more positive (few volts) than its Source

-With P-ch devices everything is the opposite
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Old 9th October 2011, 08:38 AM   #247
generg is online now generg  Germany
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Quote:
Originally Posted by Zen Mod View Post
naah ......

do not worry ........

what's little smoke , between friends .......



(disclaimer - as long someone is still sane in our musings )

You are right! Juma is invited!
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Old 9th October 2011, 10:17 AM   #248
Zen Mod is offline Zen Mod  Serbia
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Default well - this JPG is certainly flawless ......

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Old 9th October 2011, 02:06 PM   #249
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Quote:
Originally Posted by Bksabath View Post
..Ops.
Chester or Jester ?
5:43 => Court Jester - Part 6/11 - YouTube
(haa, no one outfoxes the fox)

Py-Jamas => P-channel = J (shoot, now i can't use that joke anymore)
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Last edited by jacco vermeulen; 9th October 2011 at 02:10 PM.
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Old 10th October 2011, 07:06 AM   #250
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Apart from jacco and yours trully Jokes

AL I wanted to say it would be nice to have a place where to meet and share here in the UK and that I am willing to do same hard labor for it.

I am prety good with barbeque and such.
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