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2nd February 2009, 04:20 PM
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#1 |
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diyAudio Member
Join Date: Mar 2008
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Input Stage Question
Hi, I have a question:
Is there a real difference between the input stage A and B? Input Stage A - from Randy Slone  and Input Stage B - from SiliconChip  Some interesting links to read more about it? How is configured the VAS in Input Stage A sorry for my Englis 
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2nd February 2009, 04:35 PM
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#2 |
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diyAudio Member
Join Date: May 2006
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Yes there is a difference, input stage of randy sloan does not work. The vas bias current is not defined and causes output offset to be unstable. The more recent sloan design has changed the current mirror ltp to cascodes which works. Do a search here, of randy sloan, you will find many info about this.
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