Electronica

Save 50 - 555 Circuits (more than 97 Circuits) as: .doc (2.1MB) or .pdf
(1.4MB) (26-5-2011)
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For more data on the 555, see these pages:
555-Page 1
555-Page 2
555-Page 3
555-Test

for CD users: 555-Page 1
555-Page 2
555-Page 3
555-Test

To learn about thedevelopment 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.h
tm - history of the 555 - Page2http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Page3.h
tm - history of the 555 - Page3
http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Page4.h
tm - history of the 555 - Page4
http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Page5.h
tm - history of the 555 - Page5http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Page6.h
tm - history of the 555 - Page6
http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Page7.h

tm - history of the 555 - Page7
http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Page8.h
tm - history of the 555 - Page8http://www.semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Page9.h
tm - 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
84 CIRCUITS as of 12-9-2010 plus Frequency Divider, Constant Current, 170vPower
Supply, Audio Frequency Meter, Toggle,
Reversing A Motor, Automatic Curtain Closer, Stepper Motor Controller, Animated Display
Controller, 4 Alarm Sounds, Dice
LED Effects, Headlight Selector
97 CIRCUITS as of 12-1-2011 plus 12v DC to 12v DC Battery Charger Water Level
Detector

See TALKING ELECTRONICS WEBSITE
email Colin Mitchell: talking@tpg.com.au

INTRODUCTION
This e-bookcovers 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 operationif 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 an8-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...