Depletion mode mosfet cascoded constant current source. - Page 2

Bas Horneman · 10th April 2003, 02:28 PM

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

mlloyd1 · 10th April 2003, 02:38 PM

Sorry, I wasn't paying attention... again...SLAP!

Cool. I need to get some of those!

mlloyd1

Bas Horneman · 10th April 2003, 03:00 PM

Hi Michael,

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

Cheers,
Bas

fdegrove · 11th April 2003, 01:01 AM

Hi,

Bas,

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

Just curious,

Bas Horneman · 11th April 2003, 07:54 AM

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..

Bas Horneman · 12th May 2003, 07:49 AM

unfortunately..

jackinnj · 10th November 2008, 08:19 PM

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

kenpeter · 10th November 2008, 10:02 PM

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.

jackinnj · 10th November 2008, 10:04 PM

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 !

11th April 2003, 01:01 AM	#14
fdegrove diyAudio Senior Member Join Date: Aug 2002 Location: Belgium	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

12th May 2003, 07:49 AM	#16
Bas Horneman diyAudio Moderator Emeritus Join Date: Apr 2002 Location: The Netherlands Blog Entries: 18	I have no more DN2540'S to sell! unfortunately..

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10th April 2003, 02:38 PM	#12
mlloyd1 diyAudio Member Join Date: Feb 2001 Location: illinois	Sorry, I wasn't paying attention... again...SLAP! Cool. I need to get some of those! mlloyd1

10th April 2003, 03:00 PM	#13
Bas Horneman diyAudio Moderator Emeritus Join Date: Apr 2002 Location: The Netherlands Blog Entries: 18	Hi Michael, If you can't get them anymore...send me an email Cheers, Bas

11th April 2003, 07:54 AM	#15
Bas Horneman diyAudio Moderator Emeritus Join Date: Apr 2002 Location: The Netherlands Blog Entries: 18	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..

10th November 2008, 08:19 PM	#17
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	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

10th November 2008, 10:02 PM	#18
kenpeter diyAudio Member Join Date: Nov 2007 Location: Dallas	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.