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The circuit below can be used to test a
person’s reaction time to a precision of ±0·01 seconds.
The time is indicated by a series of seven leds showing
the output of a binary counter (4060). The two D type
flip-flops are in a 4013.
The led shown on the circuit diagram is the "stimulus".
Switch S1 starts the timer and illuminates the
stimulus led. Switch S2 stops the timer. |
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To calibrate the timer |
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1. |
Remove the 4013 from its
holder; this allows the oscillator in the 4060 to
run continuously. |
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2. |
Connect the battery and
then connect an oscilloscope across the first led
(that is, the led which is connected to pin 7 of the
4060). |
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3. |
Adjust the variable
resistor to produce an oscillation of time period
10ms. |
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Vero diagram |
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