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Old 24th July 2013, 05:29 PM   #5041
OllBoll is offline OllBoll  Sweden
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Quote:
Originally Posted by Nelson Pass View Post
If you are looking to have a current source (high output impedance) amplifier,
then it would work. If I were doing that, I would say you can eliminate R2
and run the primaries in series from input to ground.

Cool, Ideally I want a current source amp so that would work even better =)

Would it still have about the same high frequency rolloff as a vanilla F6 or would it be limited as if you remove the feedback in a vanilla F6?

Last edited by OllBoll; 24th July 2013 at 05:55 PM.
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Old 25th July 2013, 02:12 AM   #5042
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Here are the response curves of an F6 with and without feedback:

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Old 25th July 2013, 02:14 AM   #5043
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Here it is in GIF
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Old 25th July 2013, 04:35 AM   #5044
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so nelson watt's new ? working on anything interesting ?
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Old 25th July 2013, 05:47 AM   #5045
OllBoll is offline OllBoll  Sweden
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Quote:
Originally Posted by Nelson Pass View Post
Here it is in GIF
Yes, I remember that curve from further back in the thread. It was the main reason why I didn't pursue a current source F6 further then. If I'm not mistaken the reason for it is the transformer, which is what made me have som wishful thinking that it would be possible to easily bypass the transformer since then the feedback could be removed without penalizing the roll off.

Is there any easy ways to extend the bandwidth without adding feedback? I guess you could hook up some resistors and caps to lower the gain before the transformer to something more uniform. In that case then my guesstimate would be a passive line level 50 khz first order highpass shorted by a large resistor would do it.

Last edited by OllBoll; 25th July 2013 at 06:00 AM.
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Old 25th July 2013, 03:08 PM   #5046
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Quote:
Originally Posted by kasey197 View Post
so nelson watt's new ? working on anything interesting ?
My sheet currently shows about 40 amplifier projects and variations. Most
of them are interesting, and most of them will be constructed for analysis.

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Old 25th July 2013, 03:11 PM   #5047
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Quote:
Originally Posted by OllBoll View Post
Is there any easy ways to extend the bandwidth without adding feedback?
You can give the output devices an active buffer. Usually if I'm looking for a
lot of bandwidth I go active.

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Old 25th July 2013, 03:18 PM   #5048
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My sheet currently shows about 40 amplifier projects and variations. Most
of them are interesting, and most of them will be constructed for analysis.

Slowin down, it seems
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Old 25th July 2013, 04:11 PM   #5049
OllBoll is offline OllBoll  Sweden
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Quote:
Originally Posted by Nelson Pass View Post
You can give the output devices an active buffer. Usually if I'm looking for a
lot of bandwidth I go active.

You mean something like this?
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Old 25th July 2013, 05:03 PM   #5050
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lower Jfet in both buffers is starved
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