4 ms·
You can't use a 555, obviously. You need to use two of them, or a 556, because you need one half for the 30 second monostable and the other half for the astabl
by ErroneousBosh 11mo ago
You can't use a 555, obviously.
You need to use two of them, or a 556, because you need one half for the 30 second monostable and the other half for the astable that drives the beeper.
Out of contrariness I'd use a CD4011 though.
- jacknews 11mo agoYou're right, but I think a 555 is maybe more than required for the buzzer. Buzz-overkill, if you like.