J-fet Zen Srpp ??? - diyAudio
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Old 6th March 2006, 04:54 PM   #1
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Default J-fet Zen Srpp ???

I came to think of this today.
Click the image to open in full size.
Of course cascode moddulation can be implemented. would it work?
As its drawn it has a ultralinear feedback arrangement.
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Old 6th March 2006, 06:11 PM   #2
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I believe it will work very well. I have a similar schematic which I
have yet to build.

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Old 7th March 2006, 03:51 PM   #3
kekso22 is offline kekso22  Germany
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The circuit should have much more gain then ZEN9?
Do you have modelled it with SPICE?

Regards
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Old 7th March 2006, 05:12 PM   #4
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Thank you Mr Pass! Looking forward to it!


kekso22: I have not spiced it. I dont know how to. I dont know if it has more gain than Zen v9, but its a way to make a simple pushpull circuit.
I just like the SRPP circuit Its simple and elegant.
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Old 7th March 2006, 05:14 PM   #5
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I think R10 should be a constant current source. It should work a lot better with a stable voltage accros R11.
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Old 7th March 2006, 05:25 PM   #6
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Or a cap around R11


Very cool circuit Circlomanen
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Old 8th March 2006, 01:23 PM   #7
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Quote:
Or a cap around R11
Yes, thats one simple solution. Thanks!

Quote:
Very cool circuit Circlomanen
Im glad you liked it! Thanks one more time!

Johannes.
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Old 8th March 2006, 02:24 PM   #8
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Click the image to open in full size.
The preamp.
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Old 8th March 2006, 03:14 PM   #9
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I think that R8 and R4 should be 33 ohms or something similar.
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Old 8th March 2006, 06:00 PM   #10
massimo is offline massimo  Italy
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Default The preamp

Some friends of mine years ago tried a Fet based SRPP circuit, using Japanese and European semi such as 2SK and BF type, but they found many problems.
The only "working" Fet/SRPP schematics I'm aware of has been published on the Japanese mag MJ.
The "secret" was the particular hi voltage Vfet used: 2SK79, made by Sony and non longer manufactured).
I understand you circuit is different, but I think it needs to be tested carefully.
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