True supersymetric 2 stage PLH-amp??? - diyAudio
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Old 14th December 2009, 08:16 PM   #1
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Default True supersymetric 2 stage PLH-amp???

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I came to think of this on today??!

I have not seen anything like this i any thread about the PLH.
I know people have been trying to X the PLH, but i have never seen anyone come up with a 2 stage version?!

Will it work?

Johannes.
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Old 15th December 2009, 05:27 AM   #2
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PLH or not - it is SUSY

look at Donut a' la overkill - DIY Audio Forum and , I believe - it's floating somewhere here too ...... ( now little searching ) as ........ ah - I found it :

Choky Susy F3 for LU1014's

nota bene - I'm pretty fast on back on napkin ....... used to improve few things ditto on bench


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Old 15th December 2009, 07:18 AM   #3
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Two stage is easy. I have both MOSFET and BJT versions :

JLH 10 Watt class A amplifier

Single stage is a bit more tricky. I have not figured out an elegant solution as yet.


Patrick
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Old 15th December 2009, 07:36 AM   #4
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If you are refering to this:
Click the image to open in full size.

Then that is a three stage version. LTP input, phase-splitter and outputstage.
My version is without the LTP. I rearrenged the phasesplitters as a a LTP, but at the same time the are splitting the phase to each of the mosfets in the output section.
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Old 15th December 2009, 07:38 AM   #5
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Quote:
Single stage is a bit more tricky. I have not figured out an elegant solution as yet.
How could you have a singelstage susy balanced PLH amp whitout the phasesplitting/input mosfet??? That would be a Son of Zen?!
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Old 15th December 2009, 07:50 AM   #6
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One, two and three stages????
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Old 15th December 2009, 10:35 AM   #7
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One can argue whether a phase splitter is a stage or not.
If it is according to your definition, then I am most happy to give you that.

Innovative circuits, as one would expect from you.

Best regards,
Patrick
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Old 15th December 2009, 10:51 AM   #8
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Quote:
One can argue whether a phase splitter is a stage or not.
If it is according to your definition, then I am most happy to give you that.
I tend to think of the phasesplitter as a gainstage, since it does have a lot of gain. I asked just to understand what you meant by "single stage".

Quote:
Innovative circuits, as one would expect from you.
Thanks!! But i dont know if it will work????
I hope it will, but i dont know. Thats why i ask here.

Johannes.
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Old 15th December 2009, 12:18 PM   #9
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The lower BJT in the phase splitter is just a source follower. In the all-FET version, I use equal resistors for top & bottom, so they are both gain <=1.

The PLH is a single stage. I tried to work out an X'ed version but came to nothing (see PLH thread). Perhaps Nelson has an idea.

I like your ideas; certainly different and often inspiring. Keep it up.


Patrick

PS Maybe someone would sim this one for you. I am not a fan of spice, and am rather short of time right now.
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Old 16th December 2009, 10:09 PM   #10
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Clever boots. A cursory examination indicates that they will
all work.

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