Switches Essay, Research Paper
2.When
the start button is pushed the switch closes and the voltage of the ?set? input
goes high causing Q to go low. However when the ?reset? input goes high, Q will
also go low until the stop switch is pressed forcing it to go high.1.The
555 oscillator forms the basic timing process of eth watch/stopwatch central
circuitry. The frequency of eth oscillation is controlled by C1 and R1. F =??????????? 1 ???????????????? C 1 x R 1 F = 1 The output of the oscillator is fed into the clock input of eth 40173.The
4017 is a decade counter. When the reset pin is high the clock pulses from the
555 chip are counted. At the first count the Q output goes high and the LED at
pin 10 controlled by TR1 goes on. On the second clock pulse, pin 5 goes high
and the second red LED controlled by TR2 goes on. At pin 9 on the third clock
pulse the buzzer controlled by TR3 and the stopwatch simultaneously go on. When
pin 11 goes high on the fourth count the bistable is reset and the counter
reset goes low, stopping the counter. However including the diode prevents JFET
being turned off allowing the stopwatch to continue to count until the stop
switch is pushed.4,5,6.When
the voltage in pin 5,9 and 10 goes high (+5V), the transistors conduct the
LED?s and buzzer are active. The 10K resistors, R1, 2 and3 limit the current
that flows into the base of the transistor and further resistors (4 and 5)
whose job it is to limit the current flowing through the LED?s.The
values I choose limit the base current to: ????? 5 – 0.6 10K?? ??? =0.4mA And the LED count to:????????????? 5 330
=
0.015mAThe
power dissipation is TR1, TR2 is:
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