| Generic Inverter Gate
| Defaults
|}
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Open the "'''Parts Bin'''" by selecting the "'''Add Part'''" tab of the "'''Toolbox'''" or the left side panel. By default, the "'''Function'''" tab of the Part Bin is active. This means that parts are sorted based on their function. Open the "'''Digital Components'''" menu and select the "'''Gates...'''" item as shown below. All the logic gate parts and devices are listed in the Part Bin. Scroll down the list and find and select â'''74LS10D'''â, which is a three-input NAND gate. Either double-click the part's name or click the "'''Place Part'''" button at the bottom of the Parts Bin to place the device on your schematic. The program may ask which section of the package you want to select. Accept all the defaults. Repeat the same procedure as above and find and select â'''74LS04D'''â, which is an logic inverter.
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You can also locate parts by filtering. Click the button labeled "'''Extended Filter...'''" in the middle of the Add Part tab of the Toolbox. This opens up the '''Select Device Dialog'''. Type in part of the device's name into the "Name" field of the Filters. For instance, typing "74LS" or "LS10" will show only devices that contain that text somewhere in the name.
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{| border="0"
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[[File:b2TUT4_2.png|thumb|left|300px]]
| valign="bottom"|
[[File:b2TUT4_3.png|thumb|left|300px]]
|-
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</tr>
</table>
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Your circuit at this point should like the figure below:
{| border="0"|-<table>| valign="top"|<tr><td> [[File:b2TUT4_5.png|420pxthumb|450px|The digital parts placed in the Schematic Editor.]]</td>|-|}</tr>
Finally, use one the wiring methods you learned in the earlier tutorial lessons to connect all the parts and I/O ports. At the end, you should have a digital circuit similar to the figure shown at the beginning of this lesson. Straight wires can always be drawn by simply clicking on device pins and dragging a line out of the pins. For drawing bent lines and multi-segment lines, sometimes you have to use the '''Wire Tool'''.
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<table>
<tr>
<td> [[File:b2TUT4_1.png|thumb|450px|The finished digital circuit.]] </td>
</tr>
== Testing the Digital Circuit by Stepping Manually ==