Hii, i am now working on my mini-project "Induction motor protection". For that i need four comparator circuit driving four 12V relays, in which 3 of them are for protection against single phasing and 1 for over temperature protection. i am using a 7805 regulator IC so that i can get constant 5V for driving comparator IC LM339. Can anybody help me to design the comparator section,please? Thanks in advance. ![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)