Brief 555 Schmitt trigger logic inverter

Schmitt triggers are voltage comparators that have 2 threshold voltages that cause the output to change state plus a middle ground voltage (hysteresis) where the output stays in the last state that it was put into.

Schmitt trigger hysteresis graph diagram by Electronzap Electronzapdotcom
Schmitt trigger hysteresis graph diagram by Electronzap Electronzapdotcom

This prevents rapid switching if the voltage is bouncing back and forth a tiny bit across any specific voltage.

Brief circuit schematics with short video – List of pages

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Assortment of commonly used integrated circuits (IC). I made a lot of videos with them.

Diagram

Simple 555 timer Schmitt trigger logic inverter circuit schematic diagram by electronzap electronzapdotcom
Simple 555 timer Schmitt trigger logic inverter circuit schematic diagram by electronzap electronzapdotcom

Diagram is explained in the video below.



Screwdriver set that I use in my videos.



These t connectors are really nice for quickly and easily connecting the end of one wire along part of a different wire.

  • When pin 2 has less than 1/3 supply voltage to it, the output goes high.
  • When pin 6 gets more than 2/3 supply voltage, the output goes low.
  • From 1/3 to 2/3 supply voltage, the output stays in whatever state it was last put into. That’s the hysteresis range if using a 555 timer as a schmitt trigger.

Video

Quick 555 timer based schmitt trigger inverting logic switch circuit schematic diagram to breadboard



Power supply I use in my videos.

Other basic 555 timer circuits:

555 timer pin layout illustrative diagram by electronzap electronzapdotcom
555 timer pin layout illustrative diagram by electronzap electronzapdotcom

Brief 555 bistable mode flip flop alternating LEDs circuit

Brief 555 timer monostable one shot mode circuit

Brief 555 timer astable multivibrator mode circuit


White version of the oscilloscope that I use in many of my recent videos.

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  • Information on this site is not guaranteed to be accurate. Always consult the manufacturer info/datasheet of parts you use. Research the proper safety precautions for everything you do.