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Old 9th November 2012, 10:38 AM   #2701
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Quote:
Originally Posted by Papa
I'm only going to make 10, and there is no intention to sell them, so it's
strictly DIY.
Not that we greedy boys do not appreciate the selfless contribution.
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Old 9th November 2012, 11:33 AM   #2702
Skorpio is offline Skorpio  Denmark
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Quote:
Originally Posted by Nelson Pass View Post
Now that the cat's out of the bag via BAF, here is the official F6 schematic.

There are several versions, but I am building 10 channels of this for in-house
use. There is a version without the input buffer, and a couple of versions
showing degeneration on the input devices and degeneration on the outputs,
which I have not chosen to use.

Very exciting design

Is the feedback compensating for the transformer distortion? I mean like this:
http://www.lundahl.se/pdfovrigt/feedbck.pdf
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Old 9th November 2012, 02:01 PM   #2703
Sandor is offline Sandor  Italy
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Will the F6 work with SIT devices?
And are those SIT devices currently available?
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Old 9th November 2012, 02:09 PM   #2704
CeeVee is offline CeeVee  Portugal
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Quote:
Originally Posted by Sandor View Post
Will the F6 work with SIT devices?
And are those SIT devices currently available?
have u done any research ?...you should before asking.
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Old 9th November 2012, 02:43 PM   #2705
Sandor is offline Sandor  Italy
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Quote:
Originally Posted by CeeVee View Post
have u done any research ?...you should before asking.
I've just hoped to get news from Nelson about SITs.

Neslon, is there any chance that we will see a SIT-F6? What about the availability of SITs?
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Old 9th November 2012, 02:51 PM   #2706
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You can build this circuit with just about anything, and that is the point of
such a topology. The Jfets I used are nice parts, but not the central thing.

The central thing to me was a nice passive way of isolating and splitting the
drive for the devices while at the same time implementing feedback, all done
passively by the transformer.

Sits will work fine, as will ordinary Mosfets.

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Old 9th November 2012, 03:25 PM   #2707
Rush is offline Rush  United States
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Quote:
Originally Posted by Nelson Pass View Post

Sits will work fine, as will ordinary Mosfets.

Do the output devised need to be matched? If so how close?

Rush
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Old 9th November 2012, 03:45 PM   #2708
Tea-Bag is offline Tea-Bag  United States
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A SIT or depletion mode device I would think would need some alterations to run negative voltage to the gate.
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Old 9th November 2012, 03:46 PM   #2709
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Rush has a very good idea, IMO. Dont tell, Rush, until i can get some ordered.
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Old 9th November 2012, 05:58 PM   #2710
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Quote:
Originally Posted by buzzforb View Post
Rush has a very good idea, IMO. Dont tell, Rush, until i can get some ordered.
Come on now I can't keep up! F5, L'AMP, F6! I should just buy shares in Plitron/Digikey.

P.S. Many thanks to Nelson for his generous support of the DIY community!
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