Good IC's to mess around with (and a question about flip flops)

[tautech]

While on the topic of logic iC's I have come across a schematic that uses a 74AC14 to buffer the output. Looking at the schematic I wonder how does a logic IC buffer a circuit. Obviously the 200 ohm in parallel puts it roughly into a 50 ohm impedance, but what do the hex inverting Schmidt do? One stage of the 74Ac14 will convert the sine to a inverted square wave, but what does sending it to the other 4 stages do in terms of buffering other than reinverting the signal?

That circuit's commonly seen as a DIY pulser:
https://www.eevblog.com/forum/projects/super-simple-'fast-edge'-pulse-generator-for-scope-based-basic-tdr/
Member w2aew did a couple or more vids on it, here's his #87 from another thread, quickly found using the forum's search for: 74AC14
https://youtu.be/NuXitMK3HSA

[Bryan]

Thanks, forgot about that video. Allen does use a similar circuit in a further video, but still not really sure why ganging a number of Schmidt's in parallel acts as a buffer? I get the resistors in parallel as it will put it near 50 ohm impedance.

https://youtu.be/9cP6w2odGUc

[Bryan]

Digitally speaking, absolutely nothing, just extra propagation delay.

But digital is a subset of analog.  What does it do to the analog signal level?  What are the output pin characteristics of a single 74AC gate?  Four in parallel (with resistors)?  What does a pin even consist of?

You'll need some materials to do your homework...  See for example page 22 of https://archive.org/stream/RcaAdvancedCmosLogicIcs74ac-74act for useful information.

Tim

That is a very interesting e-book. thanks