Zv9

[Rodeodave]

Looks a little to busy for me to do it point to point...

Here's my take on a point to point solution, although it's not the desired star-ground solution.

And if smaller bypass caps are used, like 10uF polyester-film types, they can fit between the electrolytic ones, making it easier to use component's leads for wiring.

 

[jh6you]

Beautiful . . .
And, I like your flexible diy . . .

Regards
jh

 

[plepez]

Cascode modulation ?

Can someone explain or provide pointers on how one determines the optimum modulation of the cascode tension?

Best regards.
Philippe.

PS. Thank you Nelson, the whole ZEN serie is really something in the DIY audio with this wonderful feeling it is also about “understand it by your self”.

 

[moe29]

Rodeodave,

Thanks for the diagram... very cool

i'll have to give that a try after i finish the Zen V8.

 

[Nelson Pass]

Cascode modulation ?

Can someone explain or provide pointers on how one determines the optimum modulation of the cascode tension?

You can measure (or listen) to various values.

 

[plepez]

You can measure (or listen) to various values.

Hi Nelson, thank you for your reply.

If you allow 2 more questions on this subject …
So this is a purely experimental process; no theory and no calculation?
Will a spice simulation help or are we below the validity threshold of the models?

Regards.
Philippe.

 

[GRollins]

I believe you will find that it is dependent on device variations--something that simulations do not take into account.

Grey

 

[jh6you]

Now the question would be which type of resistor sounds best

Of cource diy resistor if we can do . . .

jh

 

[Nelson Pass]

So this is a purely experimental process; no theory and no calculation?

Will a spice simulation help or are we below the validity threshold of the models?

The theory is straightforward enough - you can cancel
complementary Vds and Ids nonlinearities under the right
conditions.

You can calculate simulate this, but if you want to be certain
about the results you will test real parts.

 

[plepez]

Dear Nelson, thank you for you reply.
Ok, I have the feeling that looking at the curves published in Zen V8, I might begin to understand what it is about. I will try to simulate to grasp a better understanding but I will take your words about the real thing.

Best regards.
Philippe.

 

[Nelson Pass]

ZV8 was deliberately made as dumb as possible - I didn't want
confusion between the operation of a bare bones JFET circuit and
a version with all the trimmings.

 

[mastertech]

the biggest engineer of all time np

 

[mastertech]

the biggest law of all time moore's law

 

[carpenter]

ZV7-T applications to ZV9?

I'm facinated with the inductor version of ZV7. I'm wondering if it can be implimented with ZV8 or ZV9. Those 1000V/A plitrons of mine would make nice inductors...

Any thoughts, huh? Anyone?

John (the crazy carpenter)

 

[Blues]

Hi Steen,

Indeed, I am very excited about the project/PCB. I am working up the schematic right now and will be drawing the PCB soon. I am still doing some reading to be sure I understand what I am doing as much as possible, but I think it will be a very fun project.

I will be looking for input from everybody, and I hope I can get as much great help with this one as I did with Twisted XBOSOZ.

Cheers!
Russ

I not being a kill-joy here but can we please ask Mr. Pass to offer the PCB first...who wouldn't like something straight from the Master?

 

[apassgear]

Re: ZV7-T applications to ZV9?

I'm facinated with the inductor version of ZV7. I'm wondering if it can be implimented with ZV8 or ZV9. Those 1000V/A plitrons of mine would make nice inductors...

Any thoughts, huh? Anyone?

John (the crazy carpenter)

Power Toroids dont make nice inductors, they need to be gapped to avoid saturation with DC running through it.

 

[Russ White]

I not being a kill-joy here but can we please ask Mr. Pass to offer the PCB first...who wouldn't like something straight from the Master?

I would be the first to want to see it. But I am not very patient, so I will press on.

 

[carpenter]

Hi Apassgear

Have you constructed Nelson's ZVT-7? Nelson indicated that it performed rather well with a toroidal, and he didn't say a word about regapping anything... I'm going to reread the article again, perhaps I missed something.

John

 

[apassgear]

Re: Hi Apassgear

Have you constructed Nelson's ZVT-7? Nelson indicated that it performed rather well with a toroidal, and he didn't say a word about regapping anything... I'm going to reread the article again, perhaps I missed something.

John

You are right if these are magneticaly coupled as Nelson did for the ZV7. DC will cancel the effect of saturation over that circuit.

But they wont work for ZV8/9

 

[flg]

I believe gaping is used in that way in other applications. Mostly to use a smaller inductor/core like in a SMPs xfmr where linearity is not to much of an issue. But, I also must suggest, you would have to be over 1000VA give or take to saturate those things ... Hmmm, 100V and 5A or 10A/ch??? Actually it is only the I component that causes saturation. So how many amps bias would you like to run