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

[snoggerT]

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.

 

[Proton Soup]

TTL isn't a 0~3V waveform. it's a specification for range of acceptable output voltages and acceptable input voltages, etc.

http://digital.ni.com/public.nsf/allkb/ACB4BD7550C4374C86256BFB0067A4BD

and you could find more info via google.