I'm building this based on schematic i found at eevblog.See circuit below.
It all works but when I increase the potvalue until about 100mA
A high frequency component signal becomes apparent at the output
from my 2nd opamp.
Adding caps on my batterysupply didnt help.
But adding a 10 uF on the Drain of the mosfet solved the problem.
Can someone explain why this happens?
What else can I improve on this circuit?
View attachment 65953
It all works but when I increase the potvalue until about 100mA
A high frequency component signal becomes apparent at the output
from my 2nd opamp.
Adding caps on my batterysupply didnt help.
But adding a 10 uF on the Drain of the mosfet solved the problem.
Can someone explain why this happens?
What else can I improve on this circuit?
View attachment 65953