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TIEP//Demo3/English – Informaatioteknologian tiedekunta

In this task you will create a circuit that turns the led on, when any two of three switches are pressed together. The different colors are used for visualization, in the lab there might not be as many colors of wires.

In this task we use a counter circuit to create a up-counter, that increments its output on pressing of a switch. The output is displayed on a binary led display. The circuit only counts from 0 to 9.

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In this task all inputs of the counter circuit are not used. Also Borrow and Carry inputs are not used. The circuits below are available. You have several ways to implement the Half Dataxheet that can be done with two circuits.

74HC Datasheet pdf – Presettable synchronous BCD decade up/down counter – Philips

Below is an example of placing the components. Note that the pull-down resistors are only needed for inputs that come directly from switches.

The figure has them in all inputs. Note also that if you end up using NOR circuit, its inputs differ from other circuits.

When you are designing try to think of next task also, so you can easily continue to build a Full Adder from your Half Adder. You have several ways to implement the Full Adder that can be done with three circuits. Implement Demultiplexer one input, that is connected to dwtasheet output of two with a select switch using the circuits available.

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Implement Multiplexer two input, one of the is connected to the output with a select switch using the circuits available. Powered by Trac 0.

Visit the Trac open source project at http: Last modified 2 years ago Last modified on Half Adder, own implementation with the circuits of your choice Example on breadboard Task 4: Full Adder, own implementation with the circuits of your choice Example on breadboard Task 5: Demultiplexer, own implementation with the circuits of your choice Task 6: Multiplexer, own implementation with the circuits of your choice.

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