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The 555 Integrated Circuit (IC) is an easy to use timer that has many applications.  It is widely used in electronic circuits. it is a 8 pin ic..and also available as a dual timer ic which is 16 pin ic. pin configuration of 555 ic.                                                      Astable - free running mode: the 555 can operate as an oscillator. Uses include LED and lamp flashers, pulse generation, logic clocks, tone generation, security alarms, pulse position modulation, etc. Monostable mode: in this mode, the 555 functions as a "one-shot". Applications include timers, missing pulse detection, bouncefree switches, touch switches, frequency divider, capacitance measurement, pulse-width modulation (PWM) etc this ic has 3 operating mode. Bistable mode or Schmitt trigger: the 555 can operate as a flip-flop, if the DIS pin is not connected and no capacitor is used. Uses include bouncefree latched switches, etc. Astable mode   An  Astable Circuit  has

  I HAVE MADE DIGITAL ELECTRONIC DICE  USING LOGIC GATES AND BOOLEAN ALGEBRA IN VARIOUS COMBINATION TO DEVELOP LOGIC IN PURELY ANALOG CIRCUIT. WE HAVE USED DIFFERENT LOGIC GATES AND THEIR COMBINATIONS TO OBTAIN THE DESIRED RESULT FOR OUR PURPOSE. WE HAVE MADE AN ELECTRONIC DICE USING A 7-SEGMENT DISPLAY,4026 DECODER IC,555 TIMER,PULSE GENERATION IC AND SOME LOGIC GATES SUCH AS AND GATE AND NOT GATE       THE 4026 DECODER IC IS USED TO DISPLAY THE NUMBERS ON 7-SEGMENT DISPLAY FROM 0-9 ONE BY ONE. WHEN THE PULSE GENERATOR IC (555 TIMER IC) GIVES PULSES TO 4026.  FIRST OF ALL SOME LOGIC IS TO BE DEVELOPED SO THAT THE DECODER IC RESETS AFTER THE NUMBER 6 BECAUSE A DICE CONTAIN NUMBER UPTO 6.  WHEN THE LOGIC IS DEVELOPED WE WILL BE SUCCESSFULL IN MAKING THE 7-SEGMENT COUNT FROM 0-6 ONLY.       AFTER THAT IF WE HAVE TO STOP THE DISPLAY AT A PARTICULAR NUMBER SO THAT THE PLAYER GETS A NUMBER TO PLAY.          WORKING OF A SIMPLE 7-SEGMENT DISPLAY