Mike Candys

For our other free eBooks, Go to: 1 - 100 Transistor Circuits Go to: 101 - 200 Transistor Circuits Go to: 100 IC Circuits

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 the development and history of the 555, go to these links: http://semiconductormuseum.com/Museum_Index.htm - ageneral 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 - Page6http://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 - Page9http://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 to suit the hobbyist: see TALKING ELECTRONICS WEBSITE

Save 50 - 555 Circuits (actually 76 Circuits) as: zip (1.9MB) or .doc (1.5MB) or .pdf (1MB) (21-3-2010)
54 CIRCUITS as of 29-11-2009 Rev1.2 29-11-2009 - added Hysteresis (Schmitt Trigger, Knight Rider-2, MorseCode, Music Box, Reaction Timer Game 61 CIRCUITS as of 5-12-2009 Rev1.3 5-12-2009 - added Traffic Lights, Driving White LEDs, TV Remote Control Jammer, 3x3x3 Cube, Up/Down Fading LED, H-Bridge, H-Bridge with PWM. 64 CIRCUITS as of 14-12-2009 Bike Turning Signal, 555 on 24v, Police Lights, LED Dice, Roulette, Model Railway Time 71 CIRCUITS as of 1-1-2010 plus: Servo Controller, Curtain Closer,Stepper Motor Controller, 4-way Traffic Lights, TE555-1 Chip: Stepper Motor Controller, 76 CIRCUITS as of 10-1-2010 plus: Useless Machine, Animated Display, 4 Alarm Sounds, Police Lights-3, Dice to 7-Segment Display LED FX

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 andmost-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 CMOSchip (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 inan 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...