just build an signal amplifier which is meant to amplify by 3. Now all it does is having about 4.5 V at the output and the inverting input, whatever happens at the input. Did I kill the op amp?
The 741 has a very poor spec,.I see. I put in +6V and 0 (battery) and its going to run on +9/0 V, just trying it first on a veroboard before I do 8 of them. So it wants to have a balanced voltage?
Shall I rather go for another chip, LM358 or so?
edit: r100k goes to an LM35, had 180mV. But I pulled the resistor out, just to check, same. Put 1.5V onto the input of the LM741, still the same. Shortened the 20k resistor, voltage went down (same both ends of the 20k, thats what its meant to do). But still, seems to go into saturation? (suppose 4.5 is max when you put a nominal 6V accupack on)
While the 741 is an old chip, it is very suitable for what you are doing. However, it does reguire a dual power supply to operate properly. It can be used single supply, but with an entirely different circuit than what you are showing.and it needs symmetric voltage? Yes, did Multisim with 1V at the input, was ok. Only today I checked with less than 1V, all of sudden it has more than amplification 3 (in my case with R1 10k, R2 20k).
For upper limit: will be 3 V max, 9 V supply, all good.