scaling a voltage down using op amp
A 741 cannot do what you ask. Find a 741 data sheet, and look for "output voltage swing". You will see that, for instance, at a power supply of +/- 15 volts it will allow an output of ~+/- 12. In other words, the lowest output voltage specified is never anywhere near the - supply. In your case, the - supply is ground, so you cannot expect the 741 to give you a zero volt output.

Just as bad, please note that the 741 is specified (typically) for a voltage supply of +/- 15 volts. It really wasn't intended for any other situation.

The simplest solution to your problem is to get a "rail-to-rail output" op amp. Also check to be sure that it will handle a supply voltage of 12 volts (some will only go to 5 volts - or less). If that doesn't appeal to you, you'll need to provide a negative Vee.

With the op amp sorted out, your circuit is not a good design. Try







simulate this circuit &ndash; Schematic created using CircuitLab

EDIT: Please disregard the previous schematic. I had misread your requirement. Your circuit still won't work. For instance, if you provide a V- of about -16 to -20 volts, at 9 volts the circuit will produce -9.34 volts, and at 11 volts the output will be -12.61 volts.

Having said that you want the 9 to 11 volts to scale to 0 to 5 volts, you don't specify which value scales to which output value. For the requirement that 9 volts produces 0 volts, and with no negative supply,







simulate this circuit

does the job, while still using the 2 volt reference.