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Old 20th November 2012, 04:59 PM   #2991
Antoinel is offline Antoinel  United States
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Quote:
Originally Posted by flg View Post
Wim DeHaan's design I posted is a complementary output design. Still a nice idea I will attempt...
Thank you flg.
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Old 20th November 2012, 05:07 PM   #2992
Nelson Pass is offline Nelson Pass  United States
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This old bull will have to document the performance of the F6 with IRFP240's
so as to keep the DIYers happy.

It will need some output stage degeneration, and more bias voltage on the
voltage sources. Zeners will work fine.

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Old 20th November 2012, 05:18 PM   #2993
Antoinel is offline Antoinel  United States
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Quote:
Originally Posted by Nelson Pass View Post
This old bull will have to document the performance of the F6 with IRFP240's
so as to keep the DIYers happy.

It will need some output stage degeneration, and more bias voltage on the
voltage sources. Zeners will work fine.

In a past post regading ACA, this MOSFET was quoted to have a Gm = 2. Will additional voltage gain be needed in this version of diyF6?
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Old 20th November 2012, 05:48 PM   #2994
Antoinel is offline Antoinel  United States
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Quote:
Originally Posted by Antoinel View Post
In a past post regading ACA, this MOSFET was quoted to have a Gm = 2. Will additional voltage gain be needed in this version of diyF6?
I proposed in a past post of this thread the attached schematic in the event additional voltage gain was needed in diyF6. I already bought the PCBs from the DIYAudio store. I hope the schematic is useful for DIYers. One pending question hung: Where's one inject overall loop feedback in it?
Brgds.
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Old 20th November 2012, 05:55 PM   #2995
buzzforb is offline buzzforb  United States
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Quote:
Originally Posted by lhquam View Post
I think I have the answer to that question and I am doing simulations right now.

Build the F6 using Nelson's "F6 with Variable 2ND Harmonic" schematic with "ordinary MOSFETs" and the lower (maybe upper too) source resistor with a higher value like 0R47. The FET degeneration will be determined by the Zen pots P3 and P4, not the source resistors. BUT the bias thermal stability will be improved by the DC drop across the source resistor(s). My guess is that this will work without thermistors in the same manner as the many F5s built without thermistors.
Ilquam. I think you should try this layout with lateral fets. I started with them. It would be interesting to gt your opinion.
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Old 20th November 2012, 07:22 PM   #2996
Nelson Pass is offline Nelson Pass  United States
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You could go either way pretty easily. The design with undegenerated
Jfets had open loop gain to burn at 39 dB.

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Old 20th November 2012, 07:30 PM   #2997
dantwomey is offline dantwomey  Canada
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Quote:
Originally Posted by Nelson Pass View Post
This old bull will have to document the performance of the F6 with IRFP240's
so as to keep the DIYers happy.

It will need some output stage degeneration, and more bias voltage on the
voltage sources. Zeners will work fine.

Wow! Papa leaves no stone unturned in supporting his 'followers'.
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Old 20th November 2012, 11:39 PM   #2998
Nelson Pass is offline Nelson Pass  United States
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Especially complimentary followers.

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Old 20th November 2012, 11:56 PM   #2999
labjr is offline labjr  United States
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Originally Posted by Nelson Pass View Post
Especially complimentary followers.

Is that a hint about the next circuit?
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Old 21st November 2012, 12:40 AM   #3000
kasey197 is offline kasey197
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Quote:
Originally Posted by Nelson Pass View Post
Especially complimentary followers.

hawhawhawhaw punny! lols
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