When designing your next PCB, if you're not sure what sort of tactile switches you can fit, or how they would look, thisTactile Switch Assortment with 25 Different Buttons (10 pcs each type) is incredibly handy! You get just enough that you can prototype and even lose a couple of pieces, but not so many that you're drowning in buttons.
Also great for repair, if you're not positive about what tactile switch is in the appliance or device you're using.
Each switch is momentary-type, where the contacts on either side close when the button is pressed. Some have 4 legs since there are duplicate connections - that doesn't mean there are two separate switches. Use a multimeter on continuity mode if you're not sure of how the tact switch is set up.
These work best soldered into a PCB but many of the through-hole types can be used on a solderless breadboard as shown in this tutorial.
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