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21st May 2007, 09:27 PM
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#1 |
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diyAudio Member
Join Date: Jul 2002
Location: Baltimore, Maryland, USA
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CCS Plate Load
Can anyone help me with a cascode DN2540 50mA plate load design? I've seen some of Gary P's designs, but his site is no longer available and what is available is sparse in practical information. Thanks!!!
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They seek him here, they seek him there... |
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21st May 2007, 09:44 PM
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#2 |
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diyAudio Member
Join Date: Sep 2006
Location: Pleasant Hill, CA
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No problem; here is mine:
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The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity! |
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21st May 2007, 10:02 PM
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#3 |
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diyAudio Moderator
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Jack, here is what I've been using. For the grid-stoppers, the value will depend on your layout and the particular resistors, but 1k should be safe. I used 300R. The lower bias resistor will set the current- for the batch of DN2540 I have, 120R gave me 20mA, 300R gave me 10mA.
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“Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache |
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21st May 2007, 10:30 PM
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#4 |
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diyAudio Member
Join Date: Jun 2004
Location: Raleigh North Carolina
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Hi Jack,
Check out the articles at http://www.raleighaudio.com/MI%20articles.htm Also take a look at the line stage at http://www.raleighaudio.com/active_schematic.htm The resistors around the MOSFETs are 2.4K and, the diodes are 18V Zener. The resistor in the source sets the current. The value of this resistor must be found empirically because the characteristics of the MOSFETs vary from lot to lot. Dave |
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21st May 2007, 10:39 PM
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#5 |
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diyAudio Moderator
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Ooops, Jack points out that the symbols in my drawing were wrong- they should be N, not P. Otherwise, the drawing is correct.
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