F6 Amplifier

buzzforb said:
Single transformer.
Click to expand...

still at first morning coffee ( it doesn't matter that noon is already ) , but it looks pretty good

something like that I had in mind , asking you to toss redundant xformer ; now just few possible iterations , focusing on feedback , to make it SUSY

like this, it isn't

disclaimer - first morning coffee ....... I'm sure later I'll see Triffids on schematic :clown:
 
Cool idea but can't see how this (post 3836) would work ... Where is the voltage drive ie (Voltage between gate n source ) for each output fet coming from ?
 
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THe little circles are Vsources for the output fets. They will bias them and help establish midpoint of output. Could be wrong, stiill working on it, but it is like feeding input of ircuit with transformer that has no ground reference. Ground is relative.
 
Got that but imagine for a sec if you put a multimeter across the g and s for the fet, why wouldn't it read zero ? The gates are isolated at both ends and the transformer secondaries are also isolated....
 
Zen Mod said:
still at first morning coffee ( it doesn't matter that noon is already ) , but it looks pretty good

something like that I had in mind , asking you to toss redundant xformer ; now just few possible iterations , focusing on feedback , to make it SUSY

like this, it isn't

disclaimer - first morning coffee ....... I'm sure later I'll see Triffids on schematic :clown:
Click to expand...
Zen Mod. I hope that you [unlike me] use the trade mark SUSY[R] wisely. Mr. Pass is the best judge of that. Consult the abstract of its attendant patent to feel its scope. Distance your comments from the language used in the patent by using descriptors like cancellation of distortion, mirror image, intra communication etc..
 
kasey197 said:
Got that but imagine for a sec if you put a multimeter across the g and s for the fet, why wouldn't it read zero ? The gates are isolated at both ends and the transformer secondaries are also isolated....
Click to expand...

Gotta work now. ill give me chance to think on it. I see what you are saying. I am trying to assemble it my head in comparison to other bridged outputs.
 
kasey197 said:
Got that but imagine for a sec if you put a multimeter across the g and s for the fet, why wouldn't it read zero ? The gates are isolated at both ends and the transformer secondaries are also isolated....
Click to expand...

Because the voltage sources in the schematic would have to be referenced to ground and the rails, and they would be pulling the bias current. The input from the transformer would just be signal...

There is a lot of circuit in those circles with the V next to them.
 
6L6 said:
Because the voltage sources in the schematic would have to be referenced to ground and the rails, and they would be pulling the bias current. The input from the transformer would just be signal...

There is a lot of circuit in those circles with the V next to them.
Click to expand...

Fair enuff - so lets get to the signal - Same issue - how do we the signal across Vgs if theyre only referenced G to G
 
here it is ; time for another Black Gold beverage

sorry - it must have 2 additional caps , if one really doesn't wanna go full Babelfish route

SUSY generated with xformer action in all 4 quadrants

:devilr:

note - I didn't take care about original F6 xformer phasing
 

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  • Babelfish F6X concept.jpg
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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.
 
Zen Mod said:
here it is ; time for another Black Gold beverage

sorry - it must have 2 additional caps , if one really doesn't wanna go full Babelfish route

SUSY generated with xformer action in all 4 quadrants

:devilr:

note - I didn't take care about original F6 xformer phasing
Click to expand...
Zen Mod. Please attach a pdf copy of your schematic to print and work with it.
 
buzzforb said:
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.
Click to expand...

whatever

I can make you full DC coupled version , with integrated buffering - biasing route , but that will be too much - not so simple anymore

these feedback resistors - for their value - just multiply original F6 ones , 50-100x (say 1K8 & 10K)
 
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...
:Pawprint:
 
Zen Mod said:
better wait 'till tonight

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

I'm not used to think at day :rofl:
Click to expand...


Zen Mod. I see a point in your schematic which may need your explanation.
  • Focus on the Right side Amp
  • The phase of the input signal to the non-inverting buffer is taken to be positive
  • The phase of the buffer's output signal is also positive.
  • The phase of the power output signal is negative.
  • Consequently, the Pass negative feedback [PNF] signal to the output of the buffer has a negative phase. What is the best phase of PNF signal; positive or negative [as shown]?
  • Ditto for the Left side Amp.
 
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