Posted by **Amanda** on Saturday, November 25, 2006 at 11:45am.

I need help drawing the diagram

A three car race track has sensors in each lane at the finish line. As the cars cross the finish line their respective sensors respond and send a signal to a digital circuit. The three "finish" signals occur in the same order that the cars finish in. The digital circuit has a 3x3 matrix of nine LED's which indicate the placement of each car.

You're hired by the race track committee to design and build a digital circuit that will operate as described above.

The LED indicators must be laid out as shown on the picture.

A push button resets the circuit and extinguishes all lit LED's.

Design Hints:

*The signals from the track sensors are 10mS HIGH pulses. One pulse per race.

*Each LED is lit by an R.S. flip-flop.

*A two bit binary counter will start at zero and be incremented every time any track pulse occurs.

*Gating circuits are advised

*remember, each track signal only appears for every race

Chips Needed:

3 monostable multivibrators

97474 RS Flip-Flops

1 7476 gating chip

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