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?
- 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?
Attachments
Hi, it look like the grand mos, 10p on driver
http://francis.audio2.pagesperso-orange.fr/Grand_Mos.jpg
http://francis.audio2.pagesperso-orange.fr/Grand_Mos.jpg
Last edited:
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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