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Old 2nd October 2009, 10:57 AM   #1
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Default Yet another Push-Pull

Hai all,

I'm drawing and simulating a PP amp; it started as a Nelson Pass's Aleph Mini Clone, then evolved into an Hybrid (tube/mosfet) and now it is a full SS PP amp.
I intend to use a pair of N jfet at the input (as per Aleph Mini J), as a differential pair (or LTP).
I've seen Nelson Pass suggest 2SJ109 device, which is unfortunately not available anymore.
I'm simulating the amplifier using two BF862 device, which looks promising.
They are unfortunately available in the SOT23 package, which is not really a DIY-friendly package.

So, my question is: can you suggest me a N Jfet model, maybe in TO92 package, which can be used here, and which you like?
Of course a dual Jfet would be perfect.

Here is the schematic and LTSpice simulation (rename the txt file into a asc file).

Please check also the schematic, if you can it can be improved let me know.

Ciao,
Giovanni
Attached Images
File Type: jpg pp1.JPG (67.1 KB, 154 views)
Attached Files
File Type: txt PUSH_PULL_025.txt (11.7 KB, 11 views)
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Old 2nd October 2009, 11:43 AM   #2
AndrewT is offline AndrewT  Scotland
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I am confused.
You like Mosfets.
Do you know how and why they operate?
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Old 2nd October 2009, 12:20 PM   #3
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Quote:
Originally Posted by AndrewT View Post
I am confused.
You like Mosfets.
Do you know how and why they operate?
I know mosfets, yes.
Your statement means I forgot something important in my schematic?
I cannot understand what do you mean.
Please explain.
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Old 2nd October 2009, 12:24 PM   #4
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In the meantime I realized I posted the wrong schematic, now I'm working on the one below.
The only big difference is it uses only N channel mosfet at the output, cause I have a bag full of IRF122 devices...
Attached Images
File Type: jpg pp2.JPG (62.9 KB, 124 views)
Attached Files
File Type: txt PUSH_PULL_027.txt (11.4 KB, 3 views)
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