The 555 timer can be used as a flip flop while it is wired up in the bistable mode. Bistable means that the output is stable while it is off until it is forced to turn on via a low pulse to the trigger. And then while the output is on, it stays on, until it is forced off via a low pulse to the reset. Bistable mode can also be thought of as a schmidtt trigger.
Video below: 555 timer bistable mode push button controlled flip flop circuit build and explained Click here to watch directly on YouTube!
- Grounding the trigger sets the output high (on).
- Threshold is held at ground (0V) so that it has no chance to reach 2/3Vcc, which would end up automatically shutting setting the output low (off).
- Grounding the reset set the output low (off).
Bonus video: 555 timer outut used to control NPN BJT transistor switch in order to provide more power (voltage and or current) than 555 timer can provide.
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