Is there any way to get a 5V TTL signal (pulse of whatever duration, could even be a boxcar) from a button press with a very simple circuit or with some consumer device?
I need this to do some debugging, and am a bit surprised — given how ubiquitous TTL pulses are in electronics — that I can't find anything for the simplest possible instantiation of creating such a pulse. I would imagine a lot of people need such a device just to test stuff out 🤔 I have found a number of questions here (e.g. this one), but they seem to address much more specific use cases.
I guess I could just connect a few batteries in series to get to about 5V and just connect/disconnect the wires... But that would give me a lot of current as well, in addition to being pretty finicky to operate.