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Completely Symmetrical 32W ALL FET
Completely Symmetrical 32W ALL FET
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Old 18th May 2018, 10:29 AM   #1
lineup is offline lineup  Sweden
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I have a supplier which can sell:
- 2SK246BL 2SJ103BL complementary JFET
- 2SK216 2SJ79 complementary Lateral MOSFET
- 2SK1058 2SJ162 complementary Lateral MOSFET

So I made a symmetrical design for those. Will give like 32W in 4 Ohm and like 16W in 8 Ohm. I think.

The amplifier is very easy to understand. The R10 and R11 resistors are used to calibrate for 8mA in the input stage. I might even need to change the P2 value. Also R3 and R4 can be necessary to adjust for 50mA in the VAS.

What I want to ask is, if there is any compensation needed? Do I have to put in some capacitors in the circuit?

I am thinking putting 100pF across 2SJ79 and 100pF across 2SK216. Is this the right thing to do? How would you compensate this amplifier?
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Old 30th May 2018, 07:35 PM   #2
UltimateX86 is online now UltimateX86  France
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Hi, it look like the grand mos, 10p on driver

http://francis.audio2.pagesperso-ora.../Grand_Mos.jpg

Last edited by UltimateX86; 30th May 2018 at 07:37 PM.
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Old 30th May 2018, 08:24 PM   #3
UltimateX86 is online now UltimateX86  France
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for input stage http://jm.plantefeve.pagesperso-orange.fr/zenevo.gif
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Old 31st May 2018, 12:30 AM   #4
MadInventor is offline MadInventor  United States
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Quote:
Originally Posted by lineup View Post
I have a supplier which can sell:
- 2SK246BL 2SJ103BL complementary JFET
- 2SK216 2SJ79 complementary Lateral MOSFET
- 2SK1058 2SJ162 complementary Lateral MOSFET

What I want to ask is, if there is any compensation needed? Do I have to put in some capacitors in the circuit?

I am thinking putting 100pF across 2SJ79 and 100pF across 2SK216. Is this the right thing to do? How would you compensate this amplifier?
Hello lineup,

First, do you have a camera in my lab? I'm designing a preamp with this front-end, except I'm using Unobtainium J-Fets and a servo, no pot adjust. Speaking of which if I ask you where you get the 2SK216 2SJ79, would you tell me? Start with a 33-47 pf on the 2SK216. The high current in the VAS, is the right way to go.

Later,
MI
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