The heart of the ADC you will build in the next two labs is
the DAC you built and designed in the previous lab. The
DAC is used to generate a test voltage, 
, that is
compared against the voltage, 
, you wish to convert
into a 3 bit digit. The reference voltage will
be generated by a potentiometer. In this lab you will use
diodes and operational amplifiers to build circuits
that compare the two voltages, buffer your R2R
ladder network from this new circuitry, and then
clamp the output voltages generated by your circuit to lie
within the 0-5 volt range that can be read by the
MicroStamp11.