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please help with time delay circuit for pyrotechnics

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grimoire

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I am trying to make a time delay for electronic ignition for fireworks. I will have four stations with seperate power supplies with about 200 - 300 shots per station. Due to the amount of wire to be run, I was wondering if there was a way to send one wire to the display rack and put a 2 -3 second time delay for each shot or shots. That way I dont actually have to manually trigger each shot. I can by a time delay from any of my air conditioning parts house, but for the amount I am trying to make, it would not be economical. Any sugestions would be helpful.

I am just learning about electronics, but I have a very good understanding about electricity.
 
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