Scaling DC voltage 0v-3.3v to 0v-5v
You can use any op. amp. you would like, search for GP one (general purpose).
A simple LM358, OP07, OPA27, etc. LM358 are most common and used very often.

The schematics should be as shown below, with power supply of at least 6 volts DC to operational amplifier.



Then you have to set the Gain, which we mark with capital A.
If you use a non-inverting operational amplifier (as in this schematic, you want the output voltage the same polarity as input voltage).
Your gain must be the value, that when you will have 3.3V on the input, the output will have to be set to 5V. So let's say, that your gain will be calculated with equation Uout,max/Uin,max -> so 5V / 3.3V = 1.51515. Now, we have set your gain, but we still need to calculate the resistors.
And because you have a noninverting operational amplifier, the gain cannot be less than 1, so from your gain (1.51515), we subtract 1 and we come to the number 0.51515. This number equals now:

0.51515 = R1/R2

To determine R1 and R2, we will stick to standard E24 or at least E12 resistor series, in range from 1k to 10k (could up to 1M, but sin this range it will be just fine) somewhere inbetween.

If we set R2 to the 10k, we see, that the resistor R1 should be 5150 ohm. But, because 5150 ohm isn't quite standard resistor, we will use a 5k and 150R resistors in series to get the values we would like.
Ofcourse you can use the potentiometer (or trimmer in this case, more likely) and set it properly, but I think this is precise enough method too.

So the final schematic (as I was explaining) is here:







simulate this circuit &ndash; Schematic created using CircuitLab