True supersymetric 2 stage PLH-amp???

Circlomanen · 14th December 2009, 08:16 PM

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.

Zen Mod · 15th December 2009, 05:27 AM

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

EUVL · 15th December 2009, 07:18 AM

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

Circlomanen · 15th December 2009, 07:36 AM

If you are refering to this:

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.

Circlomanen · 15th December 2009, 07:38 AM

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?!

Circlomanen · 15th December 2009, 07:50 AM

One, two and three stages????

EUVL · 15th December 2009, 10:35 AM

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

Circlomanen · 15th December 2009, 10:51 AM

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.

EUVL · 15th December 2009, 12:18 PM

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.

Nelson Pass · 16th December 2009, 10:09 PM

Clever boots. A cursory examination indicates that they will
all work.

14th December 2009, 08:16 PM	#1
Circlomanen diyAudio Member Join Date: Sep 2004 Location: Göteborg	True supersymetric 2 stage PLH-amp??? 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. __________________ We live in a horizontal world, why use vertical topologies???

15th December 2009, 05:27 AM	#2
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	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 __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

15th December 2009, 07:36 AM	#4
Circlomanen diyAudio Member Join Date: Sep 2004 Location: Göteborg	If you are refering to this: 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. __________________ We live in a horizontal world, why use vertical topologies???

15th December 2009, 07:50 AM	#6
Circlomanen diyAudio Member Join Date: Sep 2004 Location: Göteborg	One, two and three stages???? __________________ We live in a horizontal world, why use vertical topologies???

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15th December 2009, 07:18 AM	#3
EUVL diyAudio Member Join Date: Oct 2003	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

15th December 2009, 10:35 AM	#7
EUVL diyAudio Member Join Date: Oct 2003	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

15th December 2009, 12:18 PM	#9
EUVL diyAudio Member Join Date: Oct 2003	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.

16th December 2009, 10:09 PM	#10
Nelson Pass The one and only Join Date: Mar 2001	Clever boots. A cursory examination indicates that they will all work.

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