Hello community ! I tried to adjust the amplitude of a pulse-width generator with an amplitude between 4 V and 8 V using a potentiommeter and resistances, but when k =0 the amplitude is 3.95 V instead of 4 V even if the values of components are well calculated. For k=1 i have no problem, the amplitude is 8 V. Which may be the problem ? What is the explanation for this ?