EMT1250 Experiment #7 Binary Counters PDF

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Summary

Lecture - L.Hernan (highly recommend him)
Lab - David C....

Description

Experiment #7: Binary Counters

Due Date: 05/07/2018 Objective In this experiment we will learn how to use flip flops to make; Down Counters, Up

Counters, and last but not least, Decade Counters.

Theory A binary counter can be constructed from J-K flip-flops by taking the output of one cell to the clock input of the next. The J and K inputs of each flip-flop are set to 1 to produce a toggle at each cycle of the clock input. For each two toggles of the first cell, a toggle is produced in the second cell, and so on down to the fourth cell. This produces a binary number equal to the number of cycles of the input clock signal. This device is sometimes called a "ripple through" counter. The same device is useful as a frequency divider.

Equipment ● Digital Trainer ● BreadBoard ● Two (2) JK Flip-Flop (7476)

● One (1) NAND Gate (7400)

Procedure FOR ALL FLIP FLOPS! Inputs Count -Unless Specified elsewhere this must be connected to the “Bounceless” Push Button Switch Clear -MUST be connected to a logic switch (Switch A) Set -MUST be connected to a logic switch (Switch B) J K

-MUST be connected to +5 -MUST be connected to +5

Outputs Q(a^) - Q(d^)

-Will always be connected to an LED Terminal

Procedure FOR THIS LABORATORY PART 1 1. Wire the Circuit Below. 2. Activate the SET input and record the outputs of FLIP FLOPS A, B, C, D in the table (this is count 0) 3. Press the COUNT input switch ONCE 4. Record the output of each FLIP FLOP in the table 5. Repeat steps 2 until the table is completed.

Circuit Built in class

Data

Questions Procedure Part 2 6. Wire the Circuit Below. 7. Activate the SET input and record the outputs of FLIP FLOPS A, B, C, D in the table (this is count 0) 8. Press the COUNT input switch ONCE 9. Record the output of each FLIP FLOP in the table 10. Repeat steps 2 until the table is completed. 11. Rewire the Count input from the bounceless push switch to a logic switch. 12. Repeat steps 2 and 3.

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