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Old 7th April 2013, 11:21 AM   #8771
FdW is offline FdW  Netherlands
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Originally Posted by Salas View Post
Very nice lab space, very cool builds. Those VU beg for tear down and FDW in deville font printed on their clean space. FG to 0.5MHZ only? 0.005% THD alright but some faster pulse edge would be needed in the future...
The imprinted text will (most probably) be this:

Signature Transresistance Current-Feedback BIGBT Amplifier - Frans de Wit

With thanks to 'Lazy Cat' (also note that this is not a SSA or comparable design)

Last edited by FdW; 7th April 2013 at 11:45 AM.
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Old 7th April 2013, 01:12 PM   #8772
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You're using LazyCat's balanced compound blocks ?

Been counting the power device pairs under the board, but still fail to spot any ménage-à-trois business going on.
Not using fancy emitter resistors, are you ?
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Old 7th April 2013, 01:40 PM   #8773
MiiB is offline MiiB  Denmark
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FdW going commercial.....cool
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Old 7th April 2013, 01:51 PM   #8774
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Cool Frans, the amp looks good.
I like the "flying" screen in your lab.
I have seen part of the circuitry of Frans amp and it is innovative.
The main issue is ( was ? ) to stabilize it because it is a VFA with a CFB "flavour" .
When Frans broke the loop on the simulator i could have sworn that the input stage is VFB and the output stage CFB.
That 1.45kHz does not have a particular reason. I could have taken 1kHz. More taxing would be a double tone, say 19kHz plus 20kHz.
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Old 7th April 2013, 03:22 PM   #8775
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by jacco vermeulen View Post
You're using LazyCat's balanced compound blocks ?

Been counting the power device pairs under the board, but still fail to spot any ménage-à-trois business going on.
Not using fancy emitter resistors, are you ?
This one is a 'manage-à-cenq'
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Old 7th April 2013, 03:23 PM   #8776
FdW is offline FdW  Netherlands
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Originally Posted by MiiB View Post
FdW going commercial.....cool
One has to do, what one has to do
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Old 7th April 2013, 03:24 PM   #8777
FdW is offline FdW  Netherlands
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Originally Posted by Joachim Gerhard View Post
Cool Frans, the amp looks good.
I like the "flying" screen in your lab.
You have to find your driving boots, this thing is singing like a thousand-and-one Nightingales.
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Old 7th April 2013, 03:33 PM   #8778
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Originally Posted by FdW View Post
This one is a 'manage-à-cenq'
Naughty boy, using such expensive RTO's.

(if you make this one public, some may be challenged to use €50 each VFP-4 )
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Old 7th April 2013, 03:39 PM   #8779
FdW is offline FdW  Netherlands
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Originally Posted by jacco vermeulen View Post
Naughty boy, using such expensive RTO's.

(if you make this one public, some may be challenged to use €50 each VFP-4 )
What RTO do you mean RTO - What does RTO stand for? Acronyms and abbreviations by the Free Online Dictionary.
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Old 7th April 2013, 03:49 PM   #8780
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Sfernice RTO-20 (the 0R5/20W)

Board looks difficult to mount, with 8 power devices on one side, and 8 emitter resistors on the other side of the aluminum blocks.
(lange imbus-sleutel, zeker ? )
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Last edited by jacco vermeulen; 7th April 2013 at 03:53 PM.
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