smart learning - for use with the mobile interactive … · 2020. 4. 21. · are you ready? use the...

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1

Once you have downloaded the App, you can use it to navigate the

website. You may need to follow the links on each page of the App, to

research / complete answers to all the questions.

SMART LEARNING - FOR USE WITH THE MOBILE INTERACTIVE PDF Apps FROM www.technologystudent.com

HELPFUL LINK:

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LINK

AINTRODUCTION TO THE

555 INTEGRATED CIRCUIT.

2 THIS IS A SIMPLIFIED VERSION OF A 555 CIRCUIT.IT IS A TIMER. WHEN THE SWITCH IS PRESSED

IT STARTS TO WORK. EXPLAIN HOW THE CIRCUIT WORKS.

TO ANSWER ALL THE QUESTIONS YOU WILL NEED TO DOWNLOAD THE ‘555 INTEGRATED CIRCUIT’ APP, FROM THE INTERACTIVE

MOBILE APP SECTION OF www.technologystudent.com

http://www.technologystudent.com/mobapps/555%20Intergrated%20Circuit.pdf


A 555 INTEGRATED CIRCUIT IS SEEN BELOW. PINS 2 AND 3 HAVE SPECIFIC FUNCTIONS. EXPLAIN EACH FUNCTION

12

3

5552

34 5

6781

9v

0v TRANSISTOR

LED555 TIMER

PUSHSWITCH

RESISTOR

CAPACITOR

THE PINS OF THE 555 ARE NUMBERED. COMPLETE THE TABLE BELOW, BY ADDING

THE MISSING FUNCTIONS. SOME HAVE BEEN COMPLETED FOR YOU.

3

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By V.Ryan

FUNCTION PIN

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HELPFUL LINK:



LINK

BTHE 555 MONOSTABLE

CIRCUIT.





DESCRIBE HOW THIS 555 MONOSTABLE CIRCUIT WORKS.

12

3

4 87

6

5

10K 10K

C1220uf

680ohm

680 ohm

THIS 555 MONOSTABLE CIRCUIT ENERGISESA RELAY. EXPLAIN HOW THE CIRCUIT WORKS2

+220uf

10k 10k

9v

0v

7 4 86 3

2 1 5

3 LIST THE COMPONENTS USED IN THE CIRCUIT, IN Q2.

You can label the circuit if this helps your explanation.

V.Ryan © 2020

V.Ryan © 2020

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LINK

THE 555 MONOSTABLE CIRCUIT.





EXAMINATION QUESTIONS

SMART LEARNING - FOR USE WITH THE MOBILE INTERACTIVE PDF Apps FROM www.technologystudent.comwww.technologystudent.com © 2020https://www.facebook.com/groups/254963448192823/WORLD ASSOCIATION OF TECHNOLOGY TEACHERS V.Ryan © 2020

C

+220uf

R1

9v

0v

7 4 86 3

2 1 5

1. The following question is based on the 555 monostable circuit. The circuit shown is part of a production line and controls the timing sequence. The automated production line is shown below. Parts / components move along the production line where they are sensed, clamped down, drilled and then released, moving down the production line again. The 555 monostable circuit controls the timing of the entire production line.

CONVEYOR BELT

COMPONENT TO BE DRILLED

CLAMP DRILL

SENSOR

1 2 3 4

5 6 7 8

0

9

CONTROLCIRCUITS

The timer circuit is found inside the control circuit box. The incomplete circuit diagram is found below. Add the following components to complete the timer circuit:

A. 0v and 9v supplyB. A variable resistor for altering the length timing sequence.C. A buzzer that sounds during the timing sequence.

SW2

SW1

D. Explain how your completed circuit works.

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3. The 555 timer is an IC. What does IC mean?

4. The 555 timer has a DIL layout. What does DIL mean?

2. What is the role of the variable resistor and capacitor?

TR1FROM PIN 3

V.Ryan © 2009 World Association of Technology Teachers

5. It has been found that the sound emitted by the buzzer is too low. A circuit designer has suggested that a relay be added. The circuit also needs protecting by the addition of another component placed in parallel with the relay. (See layout below)

Complete the circuit diagram by adding the relay and a suitable additional ‘protecting’ component.

6. Name the component that protects the circuit and explain how it does this.

NAME:

How the component protects the circuit.

7. What is back EMF ?

+220uf

9v

0v

7 4 86

3

2 1 5

SW2

SW1

BUZZER

R1

VARIABLERESISTOR

TR1

DIODE RELAY

8. The incomplete timer circuit is shown below. Some components are missing. Draw the missing components in the correct positions, adding suitable labels. The missing components are shown below the circuit diagram.

SWITCH BUZZER CAPACITOR

9. In the space below explain how the entire circuit works. Include an explanation of the key components and their role in the circuit.


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HELPFUL LINK:



LINK

DTHE 555

ASTABLE CIRCUIT.

3 THIS IS A SIMPLIFIED VERSION OF AN ASTABLE 555 CIRCUIT.

EXPLAIN / DESCRIBE HOW THE CIRCUIT WORKS.





THIS ASTABLE 555 CIRCUIT CREATES A PULSE. WHAT IS ANOTHER NAME FOR

THIS TYPE OF CIRCUIT?

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V.Ryan © 2020

HOW DOES A 555 ASTABLE CIRCUIT, DIFFERFROM A 555 MONOSTABLE CIRCUIT?

12

3

4 87

6

5

10K

10K

C11uf

330ohm

1 K

2 WHAT IS THE EASIEST WAY OF DETERMINING, IF A 555 CIRCUIT IS SET UPAS ASTABLE?

55

5234 5

6781

AN ASTABLE CIRCUIT IS SOMETIMES CALLED AN ‘OSCILLATOR’. TRUE OF FALSE?

TRUE

FALSE







HELPFUL LINK:



LINK

ETHE 4017B DECADE

COUNTER - PULSED BYA 555 ASTABLE CIRCUIT.

1 EXPLAIN THE ROLE PLAYED BY THE ASTABLE555 CIRCUIT, ‘PULSING’ THE 4017B DECADE

COUNTER.





1 2 3 4 5 6 7 8

16 15 14 13 12 11 10 9

4017B

0v

9v

12

3

4

87

6

5

555 F B A C G H D-ve

J E I+ve

C1 100uf

R2

1K

R3

1K2

R1

1K

R4

10KPUSH SWITCHBATTERY SNAP

RED

BLK

RESET SWITCH

+

+ +

+

+

+

+

+

+

+

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smart learning - for use with the mobile interactive … · 2020. 4. 21. · are you ready? use the...

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