Brief 555 Schmitt Trigger Logic Inverter

555 timers have 2 input terminals, which set the output voltage to the opposite supply voltage of a signal voltage.

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

Therefore, by connecting those 2 inputs together so that they see the same signal voltage, you get an output that is opposite of the input.

Low (close to ground) voltage to pin 2 (trigger) sets the output high. While a high (close to Vcc) voltage to pin 6 (threshold) sets the output low.

An LED load connected to Vcc will light up when the output is low.

Whereas an LED load connected to ground, will light up when the output is high.

Brief Circuit Schematics with Short Video List of Pages


Assorted integrated circuits (ICs) kit. Included is the NE555 timers and other commonly known ICs. I have previously covered some of the other ICs in YouTube videos. It is an Affiliate link ad that supports this channel.

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