Brief 555 bistable mode flip flop alternating LEDs circuit

Table of Contents

Bistable mode 555 timer means that the output stays in it’s current state of either high or low,¬†until forced to change to the other state. After changing states, it stays in it’s new state until forced to change again. 2 stable states = bistable.

  • High: Typically close to the positive supply voltage.
  • Low: Typically close to the negative supply voltage. This is usually the zero volt reference point ground.
555 timer pin layout illustrative diagram by electronzap electronzapdotcom
555 timer pin layout illustrative diagram by electronzap electronzapdotcom

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Diagram

Simple 555 timer bistable mode flip flop alternating LEDs circuit schematic diagram by electronzap electronzapdotcom
Simple 555 timer bistable mode flip flop alternating LEDs circuit schematic diagram by electronzap electronzapdotcom
  • Set: If the output is low, and you give a low signal to trigger pin (2), then the output will go high and stay there. That is unless the reset pin (4) is low (see below)
  • Reset: If the output is high and you give a low signal to reset pin (4), then the output will go low and stay there.
  • Reset pin (4) always overpowers trigger pin (2). So, if you give a low signal to both of them at the same time, then the output will be low.

Video

Quick 555 timer bistable flip flop mode circuit schematic to breadboard build by electronzap

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