Part Number:TL084
Hi!
I am trying to build a transistor curve tracer but at some settings I get stubborn oscillations that I really can't get rid of.
I think that HF-oscillations should be quite "easy" to get rid of, it usually just takes a small capacitor at the right place.
However, I have tried for weeks now to find that certain place.
The oscillations occur at Ub (and actually almost everywhere but it is there I measure it).
Now, using a Rig of 1k makes things work without oscillations but using Rig of 1 Ohms makes it oscillate.
I really need 1 Ohms to be able to test high power transistors (up to 5 amps momentarilly is my thought).
So why does it oscillate with Rig of 1 Ohms and not with Rig of 1k?
I have almost given up on this project.
MVH/Roger
PS
To me it seems like it is current dependent but how can a certain amount of current make things unstable?
I seem not to be able to move the picture to where i want it, I am bad with computers.