Deck 53: The 555 Timer

Question 1

If pin 5 is connected to ground through a variable resistor, the on time is shorter, and the off time is not affected.

Answer 1

True

Question 2

Pin 2 of a 555 timer must be connected to a voltage that is less than 1\10 Vcc (the applied voltage) to trigger the unit.

Answer 2

False

Question 3

When creating an on-delay relay, a(n) ____________________ is used to control the relay because the 555 timer may not be able to supply the current needed to operate it.

Answer 3

transistor

Question 4

What controls the output frequency of an oscillator using the 555 timer?

Question 5

Pin 8 is connected to ____________________.

Question 6

How is the control voltage pin (pin 5) used?

Question 7

The 555 timer is a(n) ____-pin integrated circuit that has become one of the most popular electronic devices used in industrial electronic circuits.

A) Six
B) seven
C) Eight
D) Nine

Question 8

The formula for a RC time constant is: Time = Resistance x ____.

A) Current
B) Voltage
C) Pin number
D) Capacitance