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Old 14th September 2005, 07:01 PM   #1
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Default Pass JFET Power Amplifier

Well, I guess the cat's out of the bag.

First Watt is in production with a JFET power amplifier, with
delivery next month, using the Lovoltech vertical power JFETs.

The DIY version of it can be found on

www.passlabs.com/np

under the title ZV8_POWER_JFET.PDF

This is the final draft, but you have an opportunity to correct
my grammar and errors of fact.

Enjoy.

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Old 14th September 2005, 07:05 PM   #2
PSz. is offline PSz.  United States
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Wow,
Nelson are you trying to fill an entire issue of AudioExpress this month?

Ok, now I've got to go read this one!

Thank you NP!

regards,
PSz.
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Old 14th September 2005, 07:07 PM   #3
moe29 is offline moe29  United States
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With all the hard work you put into your creations, i hope that
you weren't scooped without permission....
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Old 14th September 2005, 07:13 PM   #4
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I would say my timing was impeccable.

For those of you who want to cut to the chase without
downloading a 2M pdf, here's one of the schematics:
Attached Images
File Type: jpg temp.jpg (76.6 KB, 6948 views)
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Old 14th September 2005, 07:46 PM   #5
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I'M IN OVERLOAD

Slow down! Digikey isn't that fast!


---we will enjoy---

Thank you NP.
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Old 14th September 2005, 07:55 PM   #6
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Hi Mr. Pass
Why do you analyse and put much attention to Vds-Id curves, comparisons to triodes, pentodes... if final result is cascoded JFET?
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Old 14th September 2005, 08:00 PM   #7
paulb is offline paulb  Canada
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"Figure 1 shows a simplified schematic
of the Yamaha B1, [which] remains a highly regarded product."
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Old 14th September 2005, 08:02 PM   #8
Raj1 is offline Raj1  United Kingdom
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Quote:
Originally posted by darkfenriz
Hi Mr. Pass
Why do you analyse and put much attention to Vds-Id curves, comparisons to triodes, pentodes... if final result is cascoded JFET?

Maybe cause nearly every posting made gets dissected, from every conceivable type of viewpoint.
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Old 14th September 2005, 08:05 PM   #9
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Great news .... another Pass article .... you are spoiling us Nelson, Thx!

haven't read it yet, gonna read it at once....

cheers,
Thijs
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Old 14th September 2005, 08:08 PM   #10
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Default Re: Pass JFET Power Amplifier

Quote:
Originally posted by Nelson Pass
Well, I guess the cat's out of the bag.

First Watt is in production with a JFET power amplifier, with
delivery next month, using the Lovoltech vertical power JFETs.
Ah, that's what I thought.

I'd looked at those some time back but their input capacitance was way too high for how I'd originally thought of using them (their already high input capacitance would have been magnified by a factor of 100). And oddly enough, I was looking at them again just the night before I saw Srajan's blurb on 6 Moons.

In any case, coolness!

se
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