1. Jan 29, 2009 #1

   simo

   

   Can you tell me what is wrong with my timer. I want it to make a relay open and shut periodically. For some reason it's not working.

    

   Attached Files:

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     555 timer.doc

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     41.5 KB

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     94

   simo, Jan 29, 2009
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3. Jan 29, 2009 #2

   berkeman

   

   Staff: Mentor

   You show your output directly shorted to ground. Is that correct, or a typo?

    

   berkeman, Jan 29, 2009
4. Jan 29, 2009 #3

   simo

   

   Nope, that's how I made it.
   
   If I disconnect the output/diode junction from ground, would it sink the current?

    

   simo, Jan 29, 2009
5. Jan 29, 2009 #4

   dlgoff

   

   Science Advisor

   Gold Member

   If you do the calculation from the numbers you give, the sink current would be about 11ma, so the 555 should be able to sink that.

    

   dlgoff, Jan 29, 2009

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