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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.

http://www.uoguelph.ca/~antoon/gadgets/555/555.html

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.

Darrin

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