A 4 bit R-2R ladder DAC that can output values from 0 V to 28.1 V
A design like this is much more scalable and economical than a standard DAC since it's hard to find exponentially bigger resistances, but it's easy to find just a resistance and it's double and buy those in bulk.
Changing the value of Rf (the resistance in the top right) the amplififcation factor can be adjusted. In this case the amplification is 2.
(the op-amp can amplify as much as the voltage that is provided to it, in this case it is 30 V).
Interacting with the switches let's you see how the output voltage changes.
