LM741 Op Amp output voltage range question

[thudson]

I am building a simple op amp circuit to double the input voltage. The input range is 0-5V and the output is 0-10V. After building the circuit, the output will not go below 3.9V, even when the input is below 1.95. Even with 0V input, the output always remains 3.9V. At input of 2V and above, the output is double the input, as expected. The configuration is attached. I'm using 12V for V+ and 0V for V-, R1=R2=10kOhm. Any help is appreciated.

 

[FvM]

LM741 can't reach the intended voltage range without negative supply. Try V- = -5V. Or use rail-to-rail OP.

 

[Audioguru]

The schematic you posted shows a positive supply and a negative supply. Why didn't you use a negative supply? Every circuit in its datasheet shows a plus and minus supply.
The datasheet for the 48 years old 741 design shows that its output cannot go within 3V or 4V from the positive or negative supply.

 

[schmitt trigger]

Not only the voltage output swing is limited, but the input common-mode range is also very limited.

Use a LM358...they are very cheap and easily available.