I realize now that they are different. However my project only calls to use 5 out the 8 pins on the LM358 in effect I think it uses only one of the op-amp circuits. Since LM741 is a single op-amp I want to use that. Having said that what would be the substitute pins 4 and 8 of LM358 on LM741. Or their amplificatoin properties are completely different?
The opamps are different and might not work if a 741 opamp is used instead of the LM358:
1) The LM358 works with a supply voltage as low as 3V. The 741 needs 10V or more.
2) The LM358 works when the input voltages are as low as the negative supply voltage. The 741 does not work unless its input voltages are higher than 3V above the negative supply voltage.
3) The output of an LM358 can go down as low as the negative supply voltage. The output of a 741 does not go less than about 3V higher than the negative supply voltage.
4) The LM358 has a low supply current. The 741 has a normal much higher supply current.
Thanks for your replies. This is just what I needed to get the confusion out. Will have to replace the 741 since it is so different than the 358. Howver I will still try to make the 741 work. I will post if it will succeed.
Instead of the LM358 I use similar but much better MC33171 single opamp, MC33172 dual opamps and MC33174 quad opamps.
The minimum supply voltage is also 3V and the maximum supply is higher on the new ones.
The inputs also work at the negative supply voltage.
The outputs also go to the negative supply voltage.
They have exactly the same low supply current.
But the old ones have horrible crossover distortion and the new ones don't.
The old ones have a poor response above 2kHz and the new ones go up fine to 35kHz.
I haven't used a 741 or LM358 opamp for about 40 years.