Hey!
Op amp: LM358PE3
What i am doing:
I have thermocouples and i am trying to amplyfy the signal.
Setup:
Non-inverting, R1 = 1k, R2 = 250k, Vcc = 4.8dc
Thermocouple + to opamp +, thermocouple - to ground.
Problem 1(main focus now):
amp2 is amplyfing less then amp1(40 times difference)
Problem 2:
saturation at 3.7 volts while supply is 4.8
What i have tested:
1. i have checked all resistors and i have swapped them, no help.
2. i have swapped chip 4 times thinking i have damaged it somehow, no help.
3. Tested inverting solution - same problem.
4. Tested op-amp without thermocouple as voltage follower - working.
5. Tested non-inverting solution without thermocouple and gain of 10 -working.
From the tests i am thinking that op-amp is working and problem is related to high gain or thermocouple.
I am slowly losing my mind here..everything works at amp1 then i put thermocouple at amp2(100 % same circuit as amp1) and it fails.
I have no idea what to test next to find the problem..help
Thank you!
Op amp: LM358PE3
What i am doing:
I have thermocouples and i am trying to amplyfy the signal.
Setup:
Non-inverting, R1 = 1k, R2 = 250k, Vcc = 4.8dc
Thermocouple + to opamp +, thermocouple - to ground.
Problem 1(main focus now):
amp2 is amplyfing less then amp1(40 times difference)
Problem 2:
saturation at 3.7 volts while supply is 4.8
What i have tested:
1. i have checked all resistors and i have swapped them, no help.
2. i have swapped chip 4 times thinking i have damaged it somehow, no help.
3. Tested inverting solution - same problem.
4. Tested op-amp without thermocouple as voltage follower - working.
5. Tested non-inverting solution without thermocouple and gain of 10 -working.
From the tests i am thinking that op-amp is working and problem is related to high gain or thermocouple.
I am slowly losing my mind here..everything works at amp1 then i put thermocouple at amp2(100 % same circuit as amp1) and it fails.
I have no idea what to test next to find the problem..help
Thank you!