Hello, I'm new to this forum so I'd like to do a quick presentation of my motifs for being here.
I'm a 19 year old student interested in electronics since a couple years. I also practice airsoft, which drives most of my circuit building (for making props among other things).
So, a couple days ago I started on a project of making a bomb prop for my airsoft team. I got the beeping all figured out (555 multivibrator with diode taken from here ).
Now all I need is a timer to turn te bomb on at the start of the game (by means of pressing a button) and have the output of said timer turn on or off after a preset amount of time (planning on having 5-15-30-45 minute presets from which you can choose).
I found this page while looking for such a diagram, but unfortunately, it doesn't work for me, and the page is written in an unknown language which resemble chinglish (that Chinese-English mix we have on our gun's manuals)
it is pretty much exactly what I want, except the delays are not correct for me, and there is no formula given to calculate the delay...
And so I come here asking for help! does anyone know how to fix the diagram I found on there and know the formula to calculate R2-3-4-5?
I'm a 19 year old student interested in electronics since a couple years. I also practice airsoft, which drives most of my circuit building (for making props among other things).
So, a couple days ago I started on a project of making a bomb prop for my airsoft team. I got the beeping all figured out (555 multivibrator with diode taken from here ).
Now all I need is a timer to turn te bomb on at the start of the game (by means of pressing a button) and have the output of said timer turn on or off after a preset amount of time (planning on having 5-15-30-45 minute presets from which you can choose).
I found this page while looking for such a diagram, but unfortunately, it doesn't work for me, and the page is written in an unknown language which resemble chinglish (that Chinese-English mix we have on our gun's manuals)
it is pretty much exactly what I want, except the delays are not correct for me, and there is no formula given to calculate the delay...
And so I come here asking for help! does anyone know how to fix the diagram I found on there and know the formula to calculate R2-3-4-5?