| chipco3434 |
Well, all I know is that I would use 555 timer IC's and the rest is a mystery....
It's a count down timer for small boat racing that operates like this...
Need three, 1 second pulses at initial start (@ 3 minutes)
Two, 1 second pulses one minute later (@ 2 minutes)
One, 1 second pulse one minute later (@ 1 minute)
Three, half second pulses 30 seconds later (@ 30 seconds)
Two, half second pulses 10 seconds later. (@ 20 seconds)
One, half second pulse 10 seconds later (@ 10 seconds)
Four 1/4 second pulses every one second, 5 seconds later (@ 5 seconds)
One one second pulse at -0- seconds.
Anybody... |
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| Stocker |
sounds like something easier accomplished with a computer.
or else, multiple circuits. one circuit to do all that could get hairy. maybe have one circuit firing, start another...? |
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| chipco3434 |
Computer is not a possiblility... Too wet, too much exposure to elements.
Cascaded 555's/556's is certainly a possibility. |
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| pinkmouse |
| I'd have thought a PIC or similar would be ideal for that application. |
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| dnsey |
| I made a very similar thing for photographic processing many years ago, based on cascaded 555s. Easy and effective - just make sure that the ICs are adequately decoupled, or they may 'go off' on the wrong pulses! |
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| gmphadte |
7217, 4017, 4541, MM5369 will come handy in such design
Gajanan Phadte |
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