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Old 31st May 2014, 10:27 AM   #1
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Default Bride of Zen - mosfet gate capacitance

Hi,
i have just bought some nice pcbs to try to build the single ended Bride of Zen
I read something about the relatively high gate capacitance of the recommended mosfet, IRF 610 and 510.
I have two kind questions:
1) which is the best choice of the two ? are they perfectly equivalent ?
2) is this gate capacitance really a problem ?
I had some direct experience of the project.
I just remember that i was amazed by the differences using different power supplies, with a very nice sound coming from a regulated one.
My feeling is that with a very low noise PS the sound will be very very good.
Still i am concerned about the gate capacitance impacting maybe the high freq response
By the way my ears go up to only 15K or so i think ...
Thanks a lot and kind regards, gino
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Old 31st May 2014, 10:34 AM   #2
AndrewT is offline AndrewT  Scotland
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Build two versions. One as "standard" and one with the 510 cascoded.
Compare and then modify the one that measures/sounds worse.
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Old 31st May 2014, 10:44 AM   #3
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Quote:
Originally Posted by AndrewT View Post
Build two versions.
One as "standard" and one with the 510 cascoded.
Compare and then modify the one that measures/sounds worse.
Hi and thanks a lot for the kind reply.
Sorry but i am quite ignorant ... what means "cascode" ?
I would stick with the original schematic
But in the article both parts 510 and 610 are recommended
Speaking of sound, as the article very well explain, the quality of the PS is decisive.
I have great expectations.
Thanks and regards, gino
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Old 31st May 2014, 10:49 AM   #4
Zen Mod is offline Zen Mod  Serbia
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use any of them

post schm and I'll show you how to make cascoded one

in a meantime , read this http://www.firstwatt.com/pdf/art_cas_amp.pdf

and all other articles at FIRST WATT ARTICLES
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Old 31st May 2014, 11:04 AM   #5
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Quote:
Originally Posted by Zen Mod View Post
use any of them
Hello, Thank you very much indeed ! 1st problem solved !

Quote:
post schm and I'll show you how to make cascoded one
i am not sure what you mean ... the schematic is the one available in the net here below. I hope that the pcbs are built accordingly.

Click the image to open in full size.

Quote:
in a meantime , read this http://www.firstwatt.com/pdf/art_cas_amp.pdf
and all other articles at FIRST WATT ARTICLES
Wow ! very impressive distortion spectrum
I am exclusively interested in line stages for now.
And do you think that is possible to mod the original schema to cascode ?
It looks a little complicated to me ... but the trace on the scope is very impressive ... completely clean !
Thanks and regards, gino
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Old 31st May 2014, 12:39 PM   #6
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Try an IRF614 - lower gate capacitance.
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Old 31st May 2014, 01:26 PM   #7
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Quote:
Originally Posted by Samuel Jayaraj View Post
Try an IRF614 - lower gate capacitance.
Thanks a lot for the valuable reply
I am modifying the schema a little, moving the pot at the input
I would like to use a 10K-20K attenuator ... or a nice potentiometer
The gain is a little high for a line stage.
Thanks again.
Regards, gino
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Old 31st May 2014, 02:03 PM   #8
Zen Mod is offline Zen Mod  Serbia
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Old 31st May 2014, 05:14 PM   #9
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Quote:
Originally Posted by Zen Mod View Post
.
Thanks a lot for the very interesting advice.
This mod makes things more complicated ... and you say that there is a big improvement in terms of distortion ?
And will these improvements be evident even in a low level system ?
The rest of the chain is nothing special.
I am worried because one thing is to solder parts on a pcb another one is to start from a schema ...
Anyway i will think about it.
Interesting this cascode arrangement. Very much indeed.
Thanks again and kind regards, gino

Last edited by ginetto61; 31st May 2014 at 05:18 PM.
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Old 31st May 2014, 05:15 PM   #10
Zen Mod is offline Zen Mod  Serbia
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try it and decide

it's easy enough to build it point to point
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