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combinational sequential logic counter

sammyTheElectronicsGuy

Apr 13, 2010
1
Joined
Apr 13, 2010
Messages
1
Scenario.

a circuit is required for the following to switch on and off a motor and some indication lamps.

the circuit is the following
a spdt on/off switch
a reset switch
a 5v square wave clock pulse operating at 1hz
a number of limit switches A,B,C,D.
a light sensor.

the motor is required to turn on for 25 seconds after the power is switched on provided the A,B,C,D meet A'CD+AB'D+ABC' ( ' beside a letter means not)
after it will stay off until reset button is pressed.

i have tried to build this circuits on multisim using 2 74161n's 4 bit counters. unfortunately to no succes. any info anyone could give me would be much appreciated.

cheers sam :)
 

55pilot

Feb 23, 2010
434
Joined
Feb 23, 2010
Messages
434
You are going about it the hard way. It is a lot easier to do it using a micro.

---55p
 
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