True supersymetric 2 stage PLH-amp???

[Circlomanen]

An externally hosted image should be here but it was not working when we last tested it.

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]

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 :

http://www.diyaudio.com/forums/pass-labs/133433-choky-susy-f3-lu1014s.html

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

 

[EUVL]

Two stage is easy. I have both MOSFET and BJT versions :

http://www.diyaudio.com/forums/solid-state/3075-jlh-10-watt-class-amplifier-30.html#post658958

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


Patrick

 

[Circlomanen]

If you are refering to this:

An externally hosted image should be here but it was not working when we last tested it.

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]

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]

An externally hosted image should be here but it was not working when we last tested it.

One, two and three stages????

 

[EUVL]

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]

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".

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]

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]

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

 

[fab]

An externally hosted image should be here but it was not working when we last tested it.

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.

Hi,

Any update on this original amp circuit?

Thanks