Sequential launch controller circuit diagram

Aug 04, 2006 5 Replies

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Mitch 19 years ago

Hi there, I was searching around for a sequential launch contoller circuit and found this old post.

I was just wondering if anyone could point me in the direction of something similar to what is described below.

(the webpage is 404 - standard geocities link! :)

cheers, mitch.

---quoting old post below-------------

Hi list,

I have posted to my web page a little project of mine, that might be interesting for this list.

It's sequential launch controller, that can launch 3 rockets one after another in presettable time from 9,9 sec. to 0,1 sec. Included is also countdown timer.

Have a look at:

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Any comments are welcome.

Regards Jure

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Halam Rose 19 years ago

Its not working this instant, but you can view copies of old web sites at :

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Alternativly you could do something with 555 timers, there is a nifty little book available from Maplins for about a fiver which shows how to use and chain them and also use decade counters.

Halam

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Halam Rose 19 years ago

My error, forgot not everyone is in UK. try this

formatting link

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steve 19 years ago

After reading through the Model Rocketry isn't this type of launch controller frowned on? I thought automatic count down timers were unsafe, unless there is some kind of cut off that will interrupt the countdown? Sorry if this is a newbie type reply. I am starting back into the hobby again with my kids, so I am trying to get up to speed with the changed over the last 20 years. Steve

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Steve Humphrey 19 years ago

steve wrote: > After reading through the Model Rocketry [Safety Code] isn't this type > of launch controller frowned on? I thought automatic count down timers > were unsafe, unless there is some kind of cut off that will interrupt > the countdown?

Yes, the launcher should be fully under the control of the operator at all times. That way a launch can be "scrubbed" at the last second if, say, a youngster runs up to the launch pad. But that can be accommodated in an automatic sequencer: just design it so that the operator has to keep the launch button pressed throughout the launch sequence; releasing the button terminates the sequence.

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Jim 19 years ago

The "Mad Scientist" has a sequential controller:

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I would also be concened about safety. Needs a deadman switch or somthing, one that has to be pressed for the launching to continue.

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