one shot beep unit :homebrew
tone is changeable. on-time is changeable.
can make NASA beep as you like.
this is as RK-106 for studying ne555.
YouTube: one shot beep unit : using 555 timer
The start trigger is an external contact. Turn this on and the operation starts. The circuit is such that the on-time is not affected even if the contacts are turned on while the ne555 is doing.
There is a video in the second half that does not change the on-time even if the switch is turned on several times. How did you understand that?
It is a "board for understanding the operation of ne555" for junior high school students.
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