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The furnace controller laboratory exercise shows either a 555 timer circuit or a function generator driving the clock input of the counter. The techniques to select, place, and interconnect parts are given below. One-by-one you will need to place and interconnect the counter (74193) and the gates that create the signals Gas and Fan. After you click the New Schematic button on the toolbar, or open an existing schematic, the main window of the LTspice program will change from dark gray to light gray the light gray indicates the program is ready to operate. As you create your schematic you should periodically click the Save button on the toolbar (the icon is a floppy disk). The schematic file must have an extension of asc and can be stored in the LTspiceIV folder.ΔΆ Lab 9: of 8 To give a new schematic a file name (or create a new file name for an existing schematic): Click File > Save As And then enter the desired file name (e.g., Lab9 (with an extension of asc)) into the File name box and then click Save. To open an existing schematic, click the open-folder button on the toolbar (the button hint is Open ). Begin this process by executing the LTspice program so that you can perform schematic capture of your furnace controller design: Click Start > Programs > LTspice IV To create a new schematic, click the left-most button (icon) on the toolbar (the icon is a sheet of paper with a red circular symbol (when the pointer is on the button/icon, the button hint is New Schematic )). The circuit is simulated and the results analyzed 2.
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The parameters for the simulation must be established (e.g., the amount of time for which the circuit is to be simulated) 6. The wires in the schematic whose voltage (or current) are to be reported in the simulation results (e.g., a timing diagram) must be selected for viewing 5. A "stimulus" for the circuit must be created (e.g., a clock signal) 4. Wires must be drawn to interconnect the parts (parts placement and interconnection can be done in an iterative manner) 3. The appropriate electronic parts must be "placed" onto the schematic 2.
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To perform schematic capture and simulation of your furnace controller (or any other design) you will proceed through the following steps (see page 8 of this lab for an example schematic created using LTspice): 1. CAD programs that are designed specifically for electronic circuits are known as EDA (electronic design automation) programs. The circuit simulation feature will be used to show the output signals of the circuit in relation to the input signals using a timing diagram format. The first version of SPICE (Simulation Program with Integrated Circuit Emphasis) was introduced in Schematic capture is the process of using a computer aided design (CAD) program to draw the electronic schematic on the display of a computer and then save the schematic as a file. Linear Technology is an integrated circuit manufacturer that developed an easy-to-use version of the SPICE circuit-simulation program. This lab is written assuming that you will use the LTspice IV (Linear Technology SPICE) program for "schematic capture" and circuit simulation. 1 Lab 9 Lab 9: of 8 Using LTspice Simulation Software to Simulate a Digital Circuit Introduction: In this laboratory exercise you will use software to simulate the circuit action of the furnace controller you designed and built in an earlier laboratory exercise.