Multisim Error when importing JFET model

[tipa]

Похоже, ошибку нашёл.
 

Хотя это не влияет на настройку...Наверное модели выходных транзисторов надо менять...

[somekindasupertech]

I saw it too but it only relates to the symbol orientation. If you see the PINOUT the pins are mapped properly to the nets:

Kokorian has provided some interesting information:

"use only 2sj74 of other source than Toshiba. J174-j175 have gate cutoff voltage too high, it must be less than 1v. 2sj74 is less than 0.5v."

He provides two curve charts to review.

[tipa]

Схема неуправляемая. Увеличил R1, R2 до 6 Ом. Удалось достичь половины напряжения и ток в 1,2 Ампера при независимых источниках постоянного напряжения. У Кокоряна можете узнать, какие напряжения на затворах в его реальной схема?

[somekindasupertech]

Hi Tipa,

I have sent him a message but he is not responding at the moment. Did you try simulating his circuit with 2SJ74? I have not had a chance to yet but I will do it when I have some free time.

[tipa]

Hi - to be honest, I'm not inspired by this project. I have no idea how to steer the output transistors when I simulated their opening with regulated sources, and set the midpoint. He gave different signals to the shutters, but he didn’t get anything. I will study the theory about SRPP, and I will return to this topic. Everything should settle down in the brain, the answer sometimes comes by itself ...

[somekindasupertech]

нет коротких путей туда, куда стоит стремиться. Не важно, как медленно ты продвигаешься, главное, что ты не останавливаешься. Волко́в боя́ться — в лес не ходи́ть

I have 16 pcs of these devices so I hope to get a simple circuit working that can utilize them. Kokorian offered his design idea in good faith. I will try to utilize it.

SRPP is a popular topology in HIFI circles. I can refer some reference to:

http://sound-au.com/valves/preamps.html (see figure 3)

Old patent:

https://patentimages.storage.googleapis.com/84/88/29/5a49cb0708bba9/US3286189.pdf

[tipa]

Спасибо!!!

[somekindasupertech]

There is some further discussions going on here:

https://www.diyaudio.com/community/threads/unitedsic-uj3n065080k3s-sic-fet-amplifier-design-idea.397...

[somekindasupertech]

Hi Tipa,

I am working with another engineer. He helped to get it working better and found mistake with my instrument connections:

[tipa]

Hey super duper! The voltage swing on the oscilloscope is not visible - the dashboard is cut off, which is below. I see 12 volts on the voltmeter, but this is a small signal swing from a source of 50 volts. It seems that the terminal transistors are not swinging enough. I'm disappointed in this scheme...