The function of the 555 timer is mainly determined by two comparators. The output voltage of the them controls the state of the RS flip-flop and the discharge tube. It also contains 3 working states.

The 74LVC14A is a low-power hex Schmitt trigger with inverting buffers that can be driven from either 3.3 V or 5 V devices. It is generally used as wave and pulse shapers for high noise environments ...

More undocumented applications for the 555 ‘oscillator:’ Not all applications oscillate as we will see. Most are knowledgeable about common CMOS logic inverters and Schmitt triggers such as the 74HC04 ...

This application note shows a unique way of creating an Schmitt trigger to optimize the design. To view the application note, click on the URL below. Circuit selected for www.eepn.com by Rahul Kadam.