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Old 15th March 2013, 05:29 PM   #3861
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Quote:
Originally Posted by buzzforb View Post
Good chance mine will never work. Main reason went first route, as it made sense.
I am working it.
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Old 15th March 2013, 06:02 PM   #3862
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by buzzforb View Post
Good chance mine will never work. Main reason went first route, as it made sense.
Quote:
Originally Posted by Zen Mod View Post
better wait 'till tonight

will re-check my idea , after daily dose of work ........ and coffee

I'm not used to think at day
as I said - first sketch needed proofing ;

here it is , little brushing and , voila! , this will work - as I had glimpse few days ago ; just needed to recollect my gollumgollum memory what that was ..... ( that day I had a thought that key is driving just one winding , and left all other details for later thinking)

simmed with IRFP240 just for easiness sake

it seems I'm getting lazier each day ; using LTS for things for which I earlier used just a paper and calc

EDIT : naah ..... ooked something , as always

oomphteenth version will , eventually , work

later
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Last edited by Zen Mod; 15th March 2013 at 06:11 PM.
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Old 15th March 2013, 06:05 PM   #3863
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Quote:
Originally Posted by Antoinel View Post
I am working it.
buzzforb. Please see the attachements. My initial focus is to examine the Front End [FE] of your schematic. I show two FE options. Which option meets your objective? Here is what I see in each option.



Option 1.
  • There is Zero Signal at the summing junction due to the superposition of two signals of equal amplitude and 180 degrees out phase.
  • Thus, each primary winding is not "differencing" the input from its attendant output signal like in the primary winding of stand alone diy F6.
  • Thus, the resultant amp may appear to operate open loop. But; I am not sure if this is a correct statement.
Option 2 resolves the potential problems of Option 1; by operating FE like solo diy F6.
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Old 15th March 2013, 06:32 PM   #3864
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Quote:
Originally Posted by flg View Post
I thought I understood what he (ZM) said but, when I looked at the pic, I didn't get it. I think it is possible to cross couple the feedback if the phase is correct. The xfrmr wiring is the key to that phase...
flg. you are suggesting to use the power output port of the right-side amp to feedback the left-side amp. And to use the power output port of the left side amp to feedback the right-side amp. Thus the input signal to each buffer and its "bridge" feedback signal are in phase for the purpose of differencing.
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Old 15th March 2013, 07:23 PM   #3865
Zen Mod is offline Zen Mod  Serbia
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OK . here it is

two facts :

- previous one was perfect as SE input to BAL out ; sort of half SUSY .... half SUSY is same as little pregnant

- no way that ZM's dream of driving one winding is possible ; whatever , who cares - they're all coupled anyway , so no difference

- this one will work with either SE and Bal input , like intended

I forgot what's fourth fact , but who cares .......... aha - I'm satisfied - my usual brainstorming is usually having much more brainfarts than just two ...... and is lasting longer than just few hours
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Old 15th March 2013, 07:36 PM   #3866
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Default Cheapskate's versions

so - two versions for cheapskate Greedy Boyz

first one - functionally same as previous one with neg leg grounded - for CGB who is lacking in Jfets for input buffer ..... while not needing bal in


second one - for CGB , who is needing bal in , but is lacking some gnd in drawer ........ so - floating input



edit : first one was , essentially and effectively , what I posted in post #3862 , but still with messed up orientation of windings ; that's why I didn't realized that minus leg was redundant where it was .......

nasty redundantsess

gollumgollum
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File Type: jpg Cheapskate's-F6-SE-to-Bal.jpg (114.7 KB, 162 views)
File Type: jpg Cheapskate's-F6X-float-in.jpg (112.1 KB, 159 views)
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Last edited by Zen Mod; 15th March 2013 at 07:47 PM.
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Old 15th March 2013, 08:46 PM   #3867
lhquam is offline lhquam  United States
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I am curious why you lovers of 2nd harmonic over 3rd harmonic are promoting the notion of F6X or F6-SUSY, which will kill most of the 2nd harmonic while doing nothing about 3rd harmonic. What am I missing?
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Old 15th March 2013, 08:55 PM   #3868
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Default buzzforb; your schematic is repaired

Quote:
Originally Posted by buzzforb View Post
I was wandering how you were going to use all 4 windings. I think I am heading babelfish route. Got lots of laterals to make smoke with, figuring it out.
The repaired schematic is attached. The basic skeleton of your schematic was untouched. The new schematic resolves the concerns of kasey197 and 6L6. The key changes are :
  • The input buffers were also used as signal phase inverters on the P-channel JFET side. Their load resistors are referenced to the negative rail which is also the point of connecting the source ports of the R100As. Thus, they bias and supply signals of the correct phase to the gates of the bottom R100As. So, note points A and B at the drains of the P-channel JFETs and their final gate destination.
  • The secondary windings of the Jensen are connected like in diyF6. Note the phase of the signals at the gates of their attendant upper R100As. This arrangement resolves the concerns of kasey197 and 6L6.
Best regards
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Old 15th March 2013, 08:59 PM   #3869
PKI is offline PKI  United States
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Quote:
Originally Posted by lhquam View Post
I am curious why you lovers of 2nd harmonic over 3rd harmonic are promoting the notion of F6X or F6-SUSY, which will kill most of the 2nd harmonic while doing nothing about 3rd harmonic. What am I missing?
That was exactly my question, but I didn't have guts to ask it, thanks :-)
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Old 15th March 2013, 09:15 PM   #3870
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Quote:
Originally Posted by PKI View Post
That was exactly my question, but I didn't have guts to ask it, thanks :-)
my guess is a net performance with a vanishing %THD.
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