So I have for the last few weeks ordered small stuff off eBay, like wiring, LEDs and mechanical buttons for use with an electrical circuit, but although I have taken care to take a screenshot of the spec's for such components when that info is shown, there seem to be stuff I have ordered that don't have any specs associated with them in the sales listing.
I am now wondering, disregarding the iffy predicament of buying electrical components off some random seller on eBay, if it will be near impossible or perhaps too difficult, to work with such un-spec'ed components.
I think I've learned that you can do a measurement (diode test) on a diode with a multimeter to get an idea of how much resistance the diode offer in terms of sucking up voltage, but what about contact buttons? Presumably, I would want to know, how they work (easy I guess), but also any ampere rating and voltage rating.
Presumably, the amp rating for such parts would then have to be guessed, in cases where I do not have specs for the components I bought.
Note, I do not yet know, if there are perchance specs included already in the packaging when buying some minor amount of components off eBay, which, if so, could solve my issue here in knowing what specs these components have.
As a bonus question, I am also wondering how to work with Surface Mounted Device (SMDs) if not intending to use the SMDs with a board, but instead, trying to install an SMD button for an installation and not some board. Any hints as to how one can work with SMDs is appreciated, though I suppose I can try youtube for that particular issue of mine.