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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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In Reply to: Re: about the actual design... posted by KevinC on July 2, 2003 at 19:09:31:
You are indeed correct. That is a cascode. I had to read up on Allen Wright's preamp cookbook and Valley&Wallman's texts to see that. Essentially, as Allen says, a common cathode gain stage (in this case a parallel set of FETS), with a grounded grid stage on top (I see you grounded the 'grid' section with a 10K resistor). This circuit essentially provides very high gain well above the device's amplification factor but with very wide bandwidth (thanks to the GG stage) and..parafeed outputs thrown in for good measure! Output impedance from a cascode is high but coupled with a transformer at 4:1 stepdown...simple and very nice Kevin.AnandR.
Edits: 10/32/01
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Follow Ups
- My bad... - AnandR 20:21:49 07/02/03 (0)
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