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Zen jfet v.8 problems, help!
Zen jfet v.8 problems, help!
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Old 17th November 2008, 12:23 PM   #11
chinsettawong is offline chinsettawong  Thailand
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Yes, and the circuit is designed for a power Jfet and not a regular Jfet.

Wachara C.
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Old 17th November 2008, 01:02 PM   #12
liberty is offline liberty  Italy
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Quote:
Originally posted by chinsettawong
Yes, and the circuit is designed for a power Jfet and not a regular Jfet.

Wachara C.

Ok, thank you.
I'll go for power jfets.

Reading the discussion linked above I had the illusion to can experiment also transistors and mosfets.

I don't undestand why they wrote about this possibility.

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Old 17th November 2008, 01:42 PM   #13
h_a is offline h_a  Europe
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Hi liberty,

maybe I could have been clearer on this.

The Zen#8 and #9 are built around the very special Lovoltech Jfet. No other part will fit here with the same performance.

There's no sense in replacing it with a mosfet*; if you don't get the jfet, you can build one of the Aleph-Series. That makes much more sense than just replacing the jfet in the Zen#8/9. In fact I bet the original mosfet Aleph beats mosfet Zen#8/9.

Go read the articles!

Have fun, Hannes

*why? Loadline cancelation does not work with a mosfet; cascoding not necessary for a power mosfet. As the jfet is depletion mode the Zen8/9 do not have any biasing network which is necessary for a mosfet/bjt.
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Old 17th November 2008, 02:35 PM   #14
liberty is offline liberty  Italy
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Quote:
Originally posted by h_a
Hi liberty,

maybe I could have been clearer on this.

The Zen#8 and #9 are built around the very special Lovoltech Jfet. No other part will fit here with the same performance.

There's no sense in replacing it with a mosfet*; if you don't get the jfet, you can build one of the Aleph-Series. That makes much more sense than just replacing the jfet in the Zen#8/9. In fact I bet the original mosfet Aleph beats mosfet Zen#8/9.

Go read the articles!

Have fun, Hannes

*why? Loadline cancelation does not work with a mosfet; cascoding not necessary for a power mosfet. As the jfet is depletion mode the Zen8/9 do not have any biasing network which is necessary for a mosfet/bjt.


Hi h_a,
yes, I undestand the purpose of zen 8 and I know from the articles why using jfets there.

The idea to try mosfets or transistors born reading the linked discussion, where users say about them.
I had many doubts reading, but I decided to try, only for experiment.

Clearly something went wrong in that discussion.
Probably there was a misunderstanding, in the page #9, between users on Q1, since only Q2 seems to be universal for mosfets and transistors and not Q1.

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