555 IC 50 Circuits Download PDF

Download 555 IC 50 Circuits PDF

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About Of The Book :

This e-book covers 555 words. 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 "ONESHOT" 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.

Contents Of The Book :

Active High Trigger

Active Low Trigger

Alarm Sounds (4 sounds)

Amplifier using 555

Animated Display

Audio Frequency Meter

Automatic Curtain Closer

Astable Multivibrator

Battery Charger

Bi-Coloured LED

Bike Turning Signal

Bi-Polar LED Driver

Bi-Stable 555

Building the Circuits

Capacitor Charge Pump

Car Lights Flasher - warning flasher

Car Tachometer

Charge Pump

Clark Zapper

Clicks Uneven

Calculator 555 7555

CMOS 555

Constant Current

Continuity Tester

Curtain Closer

Dark Detector

Dog-Bark Stopper

Dice

Dice to 7-Segment Display

Display - Animated

Divide by 2

Driving A Bi-Coloured LED

Driving A Relay

Driving White LEDs

Music Box

Negative Voltage

Normally Closed Trigger

One-Shot 555

Organ

Police Lights 1,2,3

Police Siren

Powering A Project

Pulse Extender

Pulser - 74c14

Push Pull

Push-Pull - high current

PWM Controller - FET buffer

PWM - transistor buffer