The scenario
A pushbutton switch produces noisy bouncing edges; this falling-edge triggered NE555 monostable generates a single 50 ms pulse on the first falling edge, ignoring subsequent bounces.
What is in this drawing
Read the decisions behind it.
01
Use NE555 as one-shot with TRIG pulled up to VCC and switch to ground for falling-edge trigger
02
Choose R=100k and C=470nF for ≈52 ms output pulse (1.1×R×C)
03
Tie RESET to VCC and add 10 nF bypass on CV for stable timing
Use for debouncing mechanical switches, generating fixed-width pulses from edge triggers, or driving loads that require a clean digital pulse.
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