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RC Timer Delay Self arming circuit

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EoDGuy

Joined Jan 7, 2010
1
I am an EoD Tech with the Army and I am currently trying to create a circuit that is RC activated has a time delay, by way of a 555 IC, and fires the penalty at the end of the delay. I have attempted a few different way but so far farthest I have gotten is using a 510 MOSFET to run the current from my walkabout to the 555, then from the 555 to a second 510 MOSFET to run a relay. My issue from here is that I can not plug my penalty onto either side of the relay due to frist activation. NO on the relay is energized and when starting the timer the NC on the relay becomes energized, I.E. detonation no matter what I do. I apreciate any suggestions, but I'm sure if we get this built, my training partners won't be ready to jump up and say thanks. =)
 
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