Study the circuit,components and doing simulation for the circuit

Following our schedule, we have to study about the components used in the circuit and doing simulation of the circuit. So, we decided to divided the works. Mei Leng will study about the components while Hafizan will try to simulate the circuit using Circuit Maker 2000.

Components that we use in the long duration timer circuit are resistors, capacitors, dual timer 556 and 7493 counter.

I have find some relevant information about dual timer 556 from internet. Dual timer 556 constructed from two 555 timers in a 14 pins DIL package. The figure below shows the dual timer 556.

On the other hand, i also study the 7493 counter. Figure below shows the shematic diagram of 7493 counter.

Hafizan is trying to simulate the circuit today. However, some errors existed. He can't get the simulation result. One of the problem is we can't find the switch component in Circuit Maker 2000. Due to this problem, we can't get the simulation result. So, we decide to seek for help from our lecturer tomorrow.

Website Visited :

http://www.kpsec.freeuk.com/555timer.htm

http://www.world-class-programme.com/555-Timer.asp

http://www.scribd.com/doc/6990865/74ls93

http://en.wikipedia.org/wiki/555_timer_IC

http://tams-www.informatik.uni-hamburg.de/applets/hades/webdemos/30-counters/60-ttl/SN7493.html