From: rob@despammer.com   
      
   I've been trying out a couple of Automatic Fence Lighting circuits with   
   a 444, 741 and ldr.   
      
   I posted earlier about the circuits above , and the problem I had was   
   that I could not get a buzzer to work from pin3 of the 555.   
      
   I came across this   
   https://www.electronicshub.org/how-555-timer-ic-testing-circuit-works/   
      
   and found that out of x3 555's I had which I thought were faulty, only 1   
   was. The other 2 worked fine when used in that circuit, as both leds   
   flashed on / off alternately.   
      
   When I replaced the good?? 555 back in the fence Light Circuit I built,   
   there still no output to a buzzer.   
      
   So by logical deduction, I can only assume that the Light Fence Circuit   
   I used/built has a fault in it somewhere.   
      
   Any pointers as to where I should look.   
      
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