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Old 4th June 2008, 08:56 AM   #6081
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Is the low noise the result of operating the devices at essentially Vcb=0?
What does this circuit do, actually?


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Old 4th June 2008, 09:00 AM   #6082
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Quote:
Originally posted by janneman

What does this circuit do, actually?


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Amplifies, up to some 50dB. My guess is that it was old John's MC preamp input stage.
 
Old 4th June 2008, 09:00 AM   #6083
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And some are never, ain't that so?

Please stay technical.
Mind your own business.
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Old 4th June 2008, 09:03 AM   #6084
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Have you got any point, Edmond? Or just taunting as usually?
 
Old 4th June 2008, 09:13 AM   #6085
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As usually, I had a point.
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Old 4th June 2008, 09:16 AM   #6086
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Amplifies, up to some 50dB. My guess is that it was old John's MC preamp input stage.

That's interesting, with such heavy C-B feedback.

Edit: I see you changed R3 from 100 ohms to 10k. Did that change the gain?

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Old 4th June 2008, 09:52 AM   #6087
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Yes, it changes gain, and should be chosen according to bias current.
 
Old 4th June 2008, 12:14 PM   #6088
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John -

why not this?
Attached Images
File Type: gif jcpat_double.gif (7.4 KB, 533 views)
 
Old 4th June 2008, 12:16 PM   #6089
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That's interesting.....

Jan Didden

OT Jan, I enjoyed your interview of Eduardo de Lima in the new "Voice Coil".

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Old 4th June 2008, 12:24 PM   #6090
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John -

why not this?
Hereby distortion, same output (100mV). Less than 0.00002%. Gain 57dB. F(-3dB) = 1.7MHz. Wow!
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