=== Placing Digital Parts ===
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To build your first digital circuit, you need the following parts:
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{| border="0"
|-
| valign="top"|
|-
{| class="wikitable"
|-
! scope="col"| Part Name
! scope="col"| Part Type
! scope="col"| Part Value
|-
! scope="row"| V1
| AC Voltage Source
| 1
|-
! scope="row"| T1
| Generic T-Line
| Defaults: Z0 = 50, eeff = 1, len = 10
|-
! scope="row"| R1
| Resistor
| 50
|-
! scope="row"| R2
| Resistor
| 50
|}
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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.