Quote Originally Posted by Charlie View Post
You really should buy a Schmitt trigger device. An op-amp like a 741 does not have sufficient gain bandwidth product to be extremely fast, no matter what you glue around it. A proper Schmitt trigger device has internal architecture designed to transition states quickly, and does not need to worry about noise the way linear devices need to.
ooo i see , i guessed once about it but now i am seeing it as a truth . . well how to obtain a schmitt trigger device ? is it an I.C. or any circuitry ? i need a very pure result thanks for support please reply . .