How do I create a 0-3V TTL waveform at 20 Hz in Capture (Pspice)?

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To create a 0-3V TTL waveform at 20 Hz in Pspice, it's essential to understand that TTL refers to a standard for voltage levels rather than a specific voltage range. The user successfully adjusted the potentiometer but still struggles with generating the correct waveform. Resources, including a link to National Instruments, provide further guidance on TTL specifications and waveform generation. Additional information can be found through online searches. Understanding TTL's voltage specifications is crucial for accurate waveform creation.
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Can someone explain to me how to create a 0-3V TTL waveform at 20 Hz in Capture (Pspice)?

- edit: Figured out how to adjust the pot, but still can't figure out the TTL waveform.
 
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