How can the output voltage be increased without exceeding the binary code voltage level on a DAC with an R-2R resistor matrix?

Question

Electronics

According to the idea, it is impossible to increase the voltage, because it directly depends on the code that we set. Perhaps there are some secret ways from the category to add some element to the circuit. Or you can increase the reference voltage, then according to the formula it may well turn out. In this case, it is necessary to insert some kind of potentiometer into the circuit, with which it will be possible to adjust the reference voltage.

Answer 1

Put an op-amp on the output of R2R and get a completely arbitrary voltage at the output (within the output range of the op-amp). The operational amplifier also has such an important plus that R2R is sensitive to load resistance, the lower the resistance, the more the output voltage will "float". The op-amp has a very high input impedance, so paired with R2R it will work just fine.
Article on Habré
I think that the simplest circuit is suitable for you - a non-inverting amplifier.