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Old 10th April 2005, 09:39 PM   #1
MaXiZ is offline MaXiZ  Italy
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Default Any reason?

Hi to all!
I've build various p3a amplifier.
But i've noticed that with some output it doesen't work..
Why?
I've build it with MJE4281 and MJF44H.
But with MJW22191/2 desen't seem any way to make it work! Why?
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Old 11th April 2005, 01:22 AM   #2
djk is offline djk
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Probably because none of those numbers are any good, not a one of them.
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Old 11th April 2005, 05:54 AM   #3
MaXiZ is offline MaXiZ  Italy
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Could u explaind a little bit more?
I'm not an electronic engeneer...
What mean?
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Old 11th April 2005, 12:32 PM   #4
edl is offline edl  Hungary
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I have never heard about these transistors. Google neither.
I think they aren't in production.

Or maybe they are home-made transistors, fabricated by you?
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Old 11th April 2005, 04:22 PM   #5
MaXiZ is offline MaXiZ  Italy
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http://www.onsemi.com/pub/Collateral/MJF44H11-D.PDF
http://www.onsemi.com/pub/Collateral/MJW21192-D.PDF
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Old 11th April 2005, 04:33 PM   #6
MikeB is offline MikeB  Germany
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Could you explain "doesn't work" ?

Maybe you accidently swapped pnp and npn, that's a trap
with these devices, MJW21191 = pnp,MJW21192 = npn.
I don't see any reason why these shouldn't work, except that
they are not "state of the art"-devices.

Mike
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Old 11th April 2005, 04:40 PM   #7
MaXiZ is offline MaXiZ  Italy
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And what are the parameter that i should look to see if they're "state of the art" or not?
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Old 11th April 2005, 04:52 PM   #8
MikeB is offline MikeB  Germany
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The hfe-curve, 2nd breakdown (SOA), vbe-curve, maxdissipation,ft,
thermal resistance (junction to case) and so on.
A very good transistor is the mjl3281a/1302a for example.
The mjl21196/5 is also not bad.
Or take a look to the sanken 2sc2922/2sa1216.

Mike
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Old 11th April 2005, 07:56 PM   #9
MaXiZ is offline MaXiZ  Italy
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Quote:
Originally posted by MikeB
Could you explain "doesn't work" ?

Maybe you accidently swapped pnp and npn, that's a trap
with these devices, MJW21191 = pnp,MJW21192 = npn.
I don't see any reason why these shouldn't work, except that
they are not "state of the art"-devices.

Mike

MJW21191 at +v and mjw21192 at -v right?
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Old 11th April 2005, 08:06 PM   #10
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70-90% (EF output) probability otherwise
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