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[tooldude]

Hi-

I

View attachment 35536

 

[darrins]

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

 

[darrins]

Here's a cool website that shows an animation of a 555 timer in astable mode.

http://www.williamson-labs.com/480_555.htm

To stop the timer, you can ground pin 4 (reset).

Cheers.

Darrin

 

[hotwaterwizard2]

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Here is a simple solution.
Just leave out the loop wire!


http://www.redcircuits.com/Page72.htm