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Old 26th July 2012, 10:14 PM   #331
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Quote:
Originally Posted by lhquam View Post
I think maybe Papa has hit a roadblock on his design and is looking for ideas from us.
If so, then Zen Mod's suggestion of using Enhancement and Depletion N-Jfets [with in-phase driveto their gates] is a possibility. Granted the two devices are exact opposites in characteristics; such that a high symmetry in operation is obtained. Loop feedback will correct for residual asymetry.
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Old 26th July 2012, 10:14 PM   #332
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Quote:
Originally Posted by lhquam View Post
I think maybe Papa has hit a roadblock on his design and is looking for ideas from us.
Haha. Very clever way of interrogating someone.
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Old 26th July 2012, 10:17 PM   #333
lhquam is offline lhquam  United States
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I realize that this is an incomplete circuit (no input buffer, and no bias circuits), but it demonstrates the drive of the output FETs from the transformer. I have no idea what inductances should be used for the transformer. In this simulation I used a 1:1 winding ratio.

watts Thd
1 0.039940%
5 0.023063%
10 0.017839%
15 0.018988%
25 0.032031%
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Old 26th July 2012, 10:22 PM   #334
Zen Mod is offline Zen Mod  Serbia
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very well worth ignoring .........

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Old 26th July 2012, 10:23 PM   #335
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What if you have positive feedback on the source follower to increase harmonics so they cancel out with the common source output?
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Old 26th July 2012, 10:45 PM   #336
alazira is offline alazira  United States
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34 pages, but no one has asked the most important question:
Will it drive F4?
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Old 26th July 2012, 10:51 PM   #337
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Quote:
Originally Posted by lhquam View Post
I realize that this is an incomplete circuit (no input buffer, and no bias circuits), but it demonstrates the drive of the output FETs from the transformer. I have no idea what inductances should be used for the transformer. In this simulation I used a 1:1 winding ratio.

watts Thd
1 0.039940%
5 0.023063%
10 0.017839%
15 0.018988%
25 0.032031%
Please reverse the phase of the transformers above to be like that in thread #1. We look forward to your comparative results.
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Old 26th July 2012, 10:55 PM   #338
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by alazira View Post
34 pages, but no one has asked the most important question:
Will it drive F4?


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clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
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Old 26th July 2012, 11:40 PM   #339
flg is offline flg  United States
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Quote:
Originally Posted by Nelson Pass View Post
This is not misdirection. Try it both ways and see.
Really?
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Old 26th July 2012, 11:54 PM   #340
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In any case, ZM corrects me. JT123-FLPCH is still available.

This is obviously one of those days where the cosmos is playing with me.

Lucky I have ZM around to play Jester.

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