This lab allows you to design and simulate any digital combinational or sequential circuit. Following instruction help you build the multiplexer circuit. A Javascript-based basic tool and simulation enigne is at the hear of this laboratory. You can create many circuits and test them with fixed or time-varying input signals. You can also see the outputs as values or time-varying waveforms.

2-bit Comparator

The tool consist of mainly two pannels: Left Pannel, Right Pannel.

• Left Pannel:You can change the settings from the left pane.

  1. Textbox: It acts as medium to show the circuit data and load the circuit data from your system

  2. Save:Click on the button to save the cicuit data in your system after give a name to your file.

  3. Load:Click on the button to load a file from your system to the textbox.

  4. Set Data:Click on the button to view the loaded circuit data in the grid.

  5. Clear Workspace:Click on the button to discard all your settings and Start a new circuit

     WARNING: When you click on Clear Workspace.It Clears everything on the page and starts fresh

  6. If you get stuck, and are not able to make the comparator, then use the load comparator button. The circuit board will become inactive and only tonggle ON/OFF will work.

• Right Pannel: The right pane contains the workspace where you will simulate your experiment.

  1. The toolbox on the left contains the pre-made logic circuits you will require to build a counter.

     In case you want to build a 2- bit comparator, please open the Comparator experiment page.

  2. Drag them on the right, to place them on your breadboard.

  3. The left part of the abstracted circuit contains the inputs, and the right side the outputs.

  4. Click on the circle of the input or output to another input/output to make a connection.

     You can connect only one line to an input, but an output can have multiple lines.

  5. The "DC" icon outputs digital 1 at all times, connnect it to:

     • -push on: to simulate the 1 only when you're pressing on the button

     • -push off: to simulate 0 when you're pushing the button

     • -toggle: to toggle the output between 1 and 0.

  6. The OSC supplies 1 and 0 in a specific frequency which you set in the settings pane.

  7. The joint icon is just a connection, to make your connections look neater, as the lines from an output to an input are straight.

  8. The DSO displays the output in a graph format for easy verification. It has 8 inputs, you can choose to use any number of them. If you want more, just drag drop more of them.