Home > Designing basic digital circuits/circuit wizard > Bistable circuit using a 555 timer

Bistable circuit using a 555 timer

This circuit is called a bistable or a ‘flip flop’ circuit as it has two states output high and output low.  It has two inputs SW2 and SW1.

bistable print screen

SW1 makes the output high so the LED comes on (555 pin 2) trigger is active low it functions when less than 1/3 VS

SW2 (555 pin 4) makes the output low and so switches the LED off.  Reset is active low and it resets at less than o.7 V

This was a simple circuit to construct and it functioned efficiently .  I made two switches simply using wire one which switched the led on the other switched the led off, these are the 2 logical states hence the name bistable

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