XPost: sci.electronics.design   
   From: me@somewhere.invalid   
      
   One of my garden lamp circuits is shown here:   
      
   https://www.dropbox.com/s/10cc6lwfrsqjp68/DiningLamp-Post.jpg?raw=1   
      
   But the CMOS 4013 flip-flop circuit suffers from occasional spurious   
   triggering. Somehow it frequently gets activated overnight.   
   Frustratingly I’m unable to pin it down. But I suspect it may be due to   
   the very long wire (60 ft or so) carrying the high-going brief input   
   signal. In places that runs alongside other wiring, some DC, some mains   
   and that situation cannot be changed.   
      
   So I’m seeking suggestions on either alternative input filtering or   
   failing that an entirely new toggle circuit.   
      
   Hope I’m not breaking the rules by posting in both forums.   
      
   Terry, East Grinstead, UK   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)