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Old 24th July 2012, 01:24 PM   #111
flg is offline flg  United States
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The circuit most likely has gain. Where, the xfrmr, the comon source? If the windings are not equal that is another variable allowing the opposing efforts of the transistors to actually have on oppose more than the other and output something
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Old 24th July 2012, 01:37 PM   #112
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And I will be happy to do it, because it means I learnt something
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Old 24th July 2012, 01:46 PM   #113
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The only way I can see it working with the signals in phase after the transformer and it still be considered symmetrical is if it does some sought of push pull, but then it would not be a class A amp
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Old 24th July 2012, 01:46 PM   #114
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one gate must be fully modulated


lower one

so - there is gain
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Old 24th July 2012, 01:48 PM   #115
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Gain in the xfrmr and no gain in the follower? The winding to the lower (current source) is a reduced ratio to modulate it ?
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Old 24th July 2012, 01:49 PM   #116
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Ok. I better leave now before my head explodes
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Old 24th July 2012, 01:50 PM   #117
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Quote:
Originally Posted by buzzforb View Post
I thought that was every time.
Not so fast buzzforb; there is another way to cheer Mr. Pass. He may chose to smile instead knowing the onus is on us DIYers to understand the F6 circuit. Let us remember that our motto is DIY: Do It [the experiments] Yourself. The attached pdf [OTLAmp2] shows a safe and practical schematic to understand the F6 circuit. Use a low +/- Vc and high values for R to safeguard the bjts or others. The phase of the secondaries of the interstage transformer [toroid or iron core] can be connected [at will] one of two ways: In or Out of phase. Compare the attendant useful output power in a non inductive 8 Ohm load. The bottom right corner of the pdf shows a possible way to understand the F6 circuit by SIMULTATION [lucky you DIYers who have this capability]. Again the signal sources can be In or Out of phase.
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Old 24th July 2012, 02:15 PM   #118
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If we seperate the two output halves... The top follower would present a signal at the output that would be in phase with the input, but, the feedback is fed to the - side of the primary allowing for - feedback.
The bottom transistor feeds the output node out of phase. If this signal were the majority of the feedback signal it would be positive feedback. Oscilators are designed with positive F.B.
I don't know it all either??? If the output haves were effectively outputing the same signal, there would be no F.B. If one is distorted and the other not, there would be F.B. correcting the distortion
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Last edited by flg; 24th July 2012 at 02:19 PM.
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Old 24th July 2012, 02:20 PM   #119
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nope
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Old 24th July 2012, 02:23 PM   #120
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Quote:
Originally Posted by flg View Post
If we seperate the two output halves... The top follower would present a signal at the output that would be in phase with the input, but, the feedback is fed to the - side of the primary allowing for - feedback.
The bottom transistor feeds the output node out of phase. If this signal were the majority of the feedback signal it would be positive feedback. Oscilators are designed with positive F.B.
I don't know it all either??? If the output haves were effectively outputing the same signal, there would be no F.B. If one is distorted and the other not, there would be F.B. correcting the distortion
Your continued analysis of the F6 circuit is beneficial and worthwhile. best regards.
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