I have tested:
- 4 different op-amps: TL071, OPA277, OPA1611, and uA741
- different capacitors between in- and output of op-amp: (22pF, 33pF, 47pF, 100pF, 1nF, 10nF, and 100nF)
- MOSFET driven directly by op-amp and via an NPN transistor; there are no differences between circuits.
Always oscillations, tested:
- R2: 1 kΩ and 10 kΩ
- R5: 47 Ω and 100 Ω
About the circuit: it's a tool for testing laboratory cables (banana plug).
X1 - a connector for the power supply (5 V, 16 A). Aimed DC/DC 5-12/12 V for op-amp supply.
C14 - 1000 μF
CSR-2.0-R010 - 10 mΩ shunt resistor
P-MOSFET - IXTH120P065T.
R_I - selectable resistor 10& ohm;, 50 Ω, 80 Ω, 100 Ω for 1 A, 5 A, 8 A, 10 A testing current.
PR1 - calibration 1 mA across T1.
Is it problem with the op-amp, layout, or something else?