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The source has a default name of "V1" and no value – it's just "V". Since we need only one source, hit the escape key to get out of "placement mode". The cursor still has a voltage source attached to it, and we could place more sources if we wanted. Move the cursor to somewhere in the left-center portion of the window and click to place the voltage source. A voltage-source symbol is attached to the cursor. The dialog closes and we are returned to the schematic drawing window.
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Within a few letters, the voltage source component be found, and the voltage source symbol will appear in the box at upper left. You could try clicking around in the component list at the bottom until you find "voltage" (for voltage source), but it easier to just use the search function. The "Select Component Symbol" dialog opens. Right click somewhere within the window and from the pop-up menu, choose "Draft –> Component". (The Mac version has no menu bar or clickable icons at the top.) You can save the file now and give the schematic a name when saving or wait and save it later after the circuit has been laid out. On either system, a blank schematic drawing window opens. Since this is a first timer's tutorial, you should choose "Start a new, blank schematic". A "Welcome to LTSpice" dialog appears with some options for opening files. On Windows, launch the program and choose "New Schematic" from the File Menu.