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
For a list of every electronicsymbol, 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 (800kB) or .doc (1.2MB) or .pdf (900kB)
54 CIRCUITS as of 29-11-2009 Rev1.2 29-11-2009 - added Hysteresis (Schmitt Trigger, Knight Rider-2, Morse Code, 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,
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50 - 555 Circuits
See TALKING ELECTRONICS WEBSITE email Colin Mitchell: firstname.lastname@example.org
This e-book covers the 555.
The 555 is everywhere and it is one of the cheapest and most-rugged chips on themarket. 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 ICL7555or 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 adual 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. Thechip 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) 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
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Each website has lots more videos and you can see exactly...