50 555 Circuits.pdf

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Go to: 1 - 100 Transistor Circuits

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For more data on the 555, see these pages:

555-Page 1 for CD users: 555-Page 1

555-Page 2 555-Page 2

555-Page 3 555-Page 3

555-Test 555-Test

To learn about the development and history of the 555, go to these links:

http://semiconductormuseum.com/Museum_Index.htm - a general discussion about the development of the transistor

http://semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Index.htm - history of the 555 - Page1

http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Page2.htm - history of the 555 - Page2

http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Page3.htm - history of the 555 - Page3

http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Page4.htm - history of the 555 - Page4

http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Page5.htm - history of the 555 - Page5

http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Page6.htm - history of the 555 - Page6

http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Page7.htm - history of the 555 - Page7

http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Page8.htm - history of the 555 - Page8

http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Page9.htm - history of the 555 - Page9

http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Page10.htm - history of the 555 - Page10

For a list of every electronic symbol, see: Circuit Symbols .

For more articles and projects for the hobbyist: see TALKING ELECTRONICS WEBSITE

See TALKING ELECTRONICS WEBSITE

email Colin Mitchell: talking@tpg.com.au

INTRODUCTION

This e-book covers the 555.

The 555 is everywhere and it is one of the cheapest and most-rugged chips on the

market.

It comes as a TTL 555 and will operate from 4v to about 16-18v. It costs from 20 cents

(eBay) to $1.20 depending on the quantity and distributor. The circuitry inside the

chip takes about 10mA - even when the output is not driving a load. This means it is

not suitable for battery operation if the chip is to be powered ALL THE TIME.

The 555 is also available as a CMOS chip (ICM7555 or ICL7555 or TLC555) and will

operate from 2v to 18v and takes 60uA when the circuitry inside the chip is powered.

The "7555" costs from 60 cents (eBay) to $2.00

We call the TTL version "555" and the CMOS version "7555." This is called

ELECTRONICS JARGON.

The 555 comes as a single timer in an 8-pin package or a dual timer (556) in a 14 pin

package.

The 7555 comes as a single timer in an 8-pin package or a dual timer (7556) in a 14 pin

package.

The 555 and 7555 are called TIMERS or Timer Chips. They contain about 28 transistors

and the only extra components you need are called TIMING COMPONENTS. This is an

external resistor and capacitor. When a capacitor is connected to a voltage, it takes a

period of time to charge. If a resistor is placed in series with the capacitor, the timing

will increase. The chip detects the rising and falling voltage on the capacitor. When

the voltage on the capacitor is 2/3 of the supply the output goes LOW and when the

voltage falls to 1/3, the output goes HIGH.

We can also do other things with the chip such as "freezing" or halting its operation, or

allowing it to produce a single HIGH-LOW on the output pin. This is called a "ONE-

SHOT" or MONOSTABLE OPERATION.

When the chip produces an output frequency above 1 cycle per second, (1Hz), the

circuit is called an OSCILLATOR and below one cycle per second, it is called a TIMER.

But the chip should not be called a " 555 Timer ," as it has so many applications. That's

why we call it a " 555 ." (triple 5)

Another thing you have to be aware of is the voltage on output pin 3. It is about 1-2v

LESS THAN rail voltage and does not go to 0v (about 0.7v for 10mA and up to 1900mV

for 200mA sinking current). For instance, to get an output swing of 10v you will need

a 12.6v supply. In "electronic terms" the 555 has very poor sinking and sourcing

capabilities.

For photos of nearly every electronic component, see this website:

https://www.egr.msu.edu/eceshop/Parts_Inventory/totalinventory.php

You can also search the web for videos showing the 555 in action.

Here are a few:

Making A 555 LED Flasher – Video Tutorial

Three 555 LED Flasher

555 Timer Flasher

Fading LED with 555 timer

Each website has lots more videos and you can see exactly how the circuits work. But

there is nothing like building the circuit and that's why you need to re-enforce your

knowledge by ACTUAL CONSTRUCTION.

Learning Electronics is like building a model with Lego bricks. Each "topic" or "subject"

or "area" must be covered fully and perfectly, just like a Lego brick is perfect and fits

with interference-fit to the next block. When you complete this eBook, you can safely

say you will have mastered the 555 - one more "building block" under your belt and in

the process learn about DC motors, Stepper motors, servos, 4017 chips, LEDs and lots

of other things. Any one of these can take you off in a completely different direction.

So, lets start . . .

Colin Mitchell

TALKING ELECTRONICS.

talking@tpg.com.au

To save space we have not provided lengthy explanations of how any of the circuits

work. This has already been covered in TALKING ELECTRONICS Basic Electronics

Course, and can be obtained on a CD for $10.00 (posted to anywhere in the world) See

Talking Electronics website ( http://www.talkingelectronics.com ) for more details on

the 555 by clicking on the following four pages: 555-Page 1 555-Page 2 555-Page

3 555-Test

Many of the circuits have been designed by Colin Mitchell: Music Box , Reaction

Timer Game , Traffic Lights , TV Remote Control Jammer , 3x3x3 Cube , while others

are freely available on the web. But this eBook has brought everything together and

covers just about every novel 555 circuit. If you think you know everything about the

555, take the 555-Test and you will be surprised!

SI NOTATION

All the schematics in this eBook have components that are labelled using the System

International (SI) notation system. The SI system is an easy way to show values

without the need for a decimal point. Sometimes the decimal point is difficult to see

and the SI system overcomes this problem and offers a clear advantage.

Resistor values are in ohms (R), and the multipliers are: k for kilo, M for Mega.

Capacitance is measured in farads (F) and the sub-multiples are u for micro, n for

nano, and p for pico. Inductors are measured in Henrys (H) and the sub-multiples are

mH for milliHenry and uH for microHenry.

A 10 ohm resistor would be written as 10R and a 0.001u capacitor as 1n.

The markings on components are written slightly differently to the way they are

shown on a circuit diagram (such as 100p on a circuit and 101 on the capacitor or 10

on a capacitor and 10p on a diagram) and you will have to look on the internet under

Basic Electronics to learn about these differences.

NEW! FROM TALKING

ELECTRONICS

A new range of 555 chips have been designed by Talking Electronics to carry out tasks

that normally need 2 or more chips.

These chips are designated: TE 555-1, TE555-2 and the first project to use the TE 555-

1 is STEPPER MOTOR CONTROLLER TE555-1 .

It's a revolutionary concept. Instead of using an old 8-pin TTL 555 chip, you can use a

new TE555-1,2,3 8-pin chip and save board space as well as components. These new

chips require considerably less external componentry and the possibilities are endless.

Depending on the circuit, they can have a number of timing and frequency outputs as

well as a "power-down" feature that consumes almost no current when the circuit is

not operating. See the first project in this series: STEPPER MOTOR CONTROLLER

TE555-1 .

See also: Stepper Motor Controller project

See also TE 555-2 TE555-3 TE 555-4 TE555-5

555 TIMER CALCULATOR

A program to work out the values for a 555 in Astable or Monostable mode is available

from Andy Clarkson's website:

http://clarkson-uk.com/555-timer/

555-Timer.zip (987KB). Name a folder: "555 Timer." Unzip and run "555 Timer

setup.exe"

Setup will produce a desktop icon. Click on icon for program. Set the voltage for the 555

then use the Astable or Monostable tabs to design your circuit. Read the Help screen to

understand the operation of: "Hold Output" and "smallest."

7555 CMOS CALCULATOR see 7555

The 555 comes in a low-power CMOS version. The drive-current from pin 3 is less than

the TTL "555."

At 5v, a 7555 will deliver 2mA and sink only 8mA

At 12v a 7555 will deliver 10mA and sink 50mA

At 15v a 7555 will deliver 100mA and sink 100mA

Use the following 7555 calculator to find the OUTPUT FREQUENCY in Astable mode or

OUTPUT TIME in Monostable mode:

7555 CMOS Calculator

Here's a 555 made with 22 transistors by Malcolm Faed. See his video .

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