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Long Duration Timer
This circuit can be used with a relay, as shown, or it can be used to drive a triac.  
If a triac is used an opto-isolator should be used.
   
 
   
With the component values shown, the range of timed periods will be from about 10 seconds to about 1 hour.  
   
Vero board, copper side.  
 
Vero board, component side.  
 
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