Schmitt Trigger using 741

[Charlie]

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.

[rajultra]

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 . .

[Charlie]

There are hundreds to choose from. Go to any manufacturer or distributor site and search. Here is only 1 example - there are likely better choices for your application.
http://www.semicon.toshiba.co.jp/inf...type=datasheet

[Art]

If it’s for hobby 74132 might be ready available.
Tie one input of a NAND high, and use the other as the Schmidt trigger input.