Hi everyone,
I am trying to built a timer circuit which will have 3 momentary push buttons that each will trigger a timer with 3 different preset durations in the range of 0-4 seconds. Once triggered the timer's output should go high until the timer runs out and any further triggering while the timer is running should be ignored. Then it should return in the idle state, waiting for the next trigger. 555 with RC network accuracy is sufficient (no need to use crystals).
Closest I could get by googling is the following:
http://home.cogeco.ca/~rpaisley4/LM555PowerOffDelay2.GIF
This seams to be exactly what I need, just missing the multiple triggers. Any thoughts on whether they could be implemented, preferably by using 3 sets of RC networks rather than 3 timers?
Thank you in advance,
Pete
I am trying to built a timer circuit which will have 3 momentary push buttons that each will trigger a timer with 3 different preset durations in the range of 0-4 seconds. Once triggered the timer's output should go high until the timer runs out and any further triggering while the timer is running should be ignored. Then it should return in the idle state, waiting for the next trigger. 555 with RC network accuracy is sufficient (no need to use crystals).
Closest I could get by googling is the following:
http://home.cogeco.ca/~rpaisley4/LM555PowerOffDelay2.GIF
This seams to be exactly what I need, just missing the multiple triggers. Any thoughts on whether they could be implemented, preferably by using 3 sets of RC networks rather than 3 timers?
Thank you in advance,
Pete