Reaction Timer Circuit
Using the 555 in its three modes at once #basicTronics 08
I will summarize the sequence of events when the circuit Reaction Timer is working:
1 — User presses Go button;
2 — Which triggers 555 — Monostable by pulsing GND in pin 2, the trigger one;
3—555 — Monostable goes high for a few seconds while its capacitor charges;
4—555 — Monostable output drops back low, communicates a pulse of low voltage through pin 4 of 555 — Bistable;
5—555 — Bistable output flips low and flops there; The LED and the display lights are on!
6 — User presses the stop button;
7 — The switch connects pin 2 of 555 — Bistable to ground;
8 — A negative to pin 2 of 555 — Bistable turns the output positive; This pulse disable the clock of 4026 IC, freezing the display;
9 — The user presses Reset button;
10 — it sends a negative pulse to pins 15 of both 4026 IC, resetting the display.
That’s it!
Note that 555 in astable mode it runs all the time!
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References & Credits:
Proteus — Reaction Timer Simulation
Alex Ishida: Video&Photo footage
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