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Old 10th April 2003, 02:28 PM   #11
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Quote:
I don't see how this will work properly unless the top MOSFET is a depletion mode device
Hi Michael,

Frank just beat me to it. Both are indeed depletion mode mosfets..

Cheers,
Bas
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Old 10th April 2003, 02:38 PM   #12
mlloyd1 is offline mlloyd1  United States
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Sorry, I wasn't paying attention... again...SLAP!
Cool. I need to get some of those!

mlloyd1
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Old 10th April 2003, 03:00 PM   #13
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Hi Michael,

If you can't get them anymore...send me an email

Cheers,
Bas
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Old 11th April 2003, 01:01 AM   #14
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Default DEPLETED.

Hi,

Bas,

May I ask what you're using this CCS for and how you think it impacts on the sound?

Just curious,
__________________
Frank
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Old 11th April 2003, 07:54 AM   #15
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Hi Frank,

first question:
Not using this particular ccs yet. Still design phase. Dunno yet where or when I will use it. But a guy like me had better do his homework
The first time I used the depleted mosfet...single was as a constant current sink in my differential amp

second question:
No idea.
..it is supposed to sound better than a plate resistor or plate choke.

Cheers,
Bas

Don't forget I am new to diy audio...got to explore..
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Old 12th May 2003, 07:49 AM   #16
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Default I have no more DN2540'S to sell!

unfortunately..
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Old 10th November 2008, 08:19 PM   #17
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The LND150N3 N-Channel Depletion MOSFET is available at Mouser for $0.55 -- featured in this article on Headwize:

http://www.headwize.com/projects/cavalli2_prj.php
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Old 10th November 2008, 10:02 PM   #18
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If you are gonna abuse a battery, I don't see the point of limiting
yourself to depletion mode devices. The little 12v used for alarm
fobs seems a convenient package for that sort of duty.

IGBTs seem to have the highest Gm for the least capacitance.
You might investigate some of the latest devices. Check IXGT
6N170A, cheap but might be unobtainium in hobby quantities.
Do sneak a peek at the spec sheet anyways...

If you can live with a mere 600V equivalent part, obtaining a
handful of sand to smokeout is a lot less challenging.

Nelson Pass once built a very successful IGBT amp back when
the one and only complimentary P-Channel IGBT ever offered
was briefly available.

Like sweep tubes, they are good for more than one thing.
Don't let a switching characterization limit your thinking.
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Old 10th November 2008, 10:04 PM   #19
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Quote:
Originally posted by kenpeter

Like sweep tubes, they are good for more than one thing.
Don't let a switching characterization limit your thinking.
I think my first ham transmitter used one !
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