A mechanical camera shutter: a small mirror slap followed by the shutter closing, with a short resonant body under it. Use it for screenshots, photo capture buttons, scanner apps and any interface that pretends to take a picture. Under 200 ms, so it fires cleanly on every tap.
mirror: white noise 18 ms, band-pass 2.4 kHz, Q 1.4, at 0 s shutter: white noise 26 ms, band-pass 1.6 kHz, Q 1.2, at 62 ms body: sine 360 Hz -> 120 Hz over 40 ms, under the shutter low-pass 7 kHz to keep it from getting clicky envelope: full level at onset, 18 ms / 26 ms linear decay