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Old 21st May 2007, 09:27 PM   #1
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Default 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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Old 21st May 2007, 09:44 PM   #2
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No problem; here is mine:

Click the image to open in full size.
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Old 21st May 2007, 10:02 PM   #3
SY is offline SY  United States
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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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Old 21st May 2007, 10:30 PM   #4
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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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Old 21st May 2007, 10:39 PM   #5
SY is offline SY  United States
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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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