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The 555 timer should be wired for astable mode for your application. I believe that there should be two timing resistors for astable mode and that pin 7 is wired at the junction of these two resistors.

Here's a good website for a tutorial on 555 timers.


I'm not sure about your replacing the 2N3053 with the TIP120 darlington. I'm sure someone more knowledgeable than myself can address that one.

Good luck with your project.


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