cengizsamanci
Newbie level 6
Hello
I would like to select gain of differential amp's gain by a controller. I used N channel Mosfets and you can see on attached sch. each of them is working individually. But when I connect them together, the output singal becomes sine wawe. Op amp is TL082. Power supply of opamp is +-18V and I apply -18 and +18V to gates of mosfets.
Could you please tell me if there would be another mosfet connection to select gain?
thank you
I would like to select gain of differential amp's gain by a controller. I used N channel Mosfets and you can see on attached sch. each of them is working individually. But when I connect them together, the output singal becomes sine wawe. Op amp is TL082. Power supply of opamp is +-18V and I apply -18 and +18V to gates of mosfets.
Could you please tell me if there would be another mosfet connection to select gain?
thank you