From: rob@despammer.com   
      
   On 22/11/2020 13:05, RobH wrote:   
   > I built an alarm circuit from a book I bought called Make Electronics by   
   > Charles Platt.   
   >   
   > https://drive.google.com/file/d/1NxvKdZCqykuSjBvPVoWz_MEMhKYMM   
   9E/view?usp=sharing   
   >   
   >   
   > The said circuit produces a siren type sound on a buzzer  so I added an   
   > led through a resistor, a 10k pot and a LDR. I then connected the centre   
   > pin of the 10k pot to pin 2 on the top IC555 shown on the schematic   
   >   
   >   
   > Working  version of the circuit   
   > https://drive.google.com/file/d/1NwYnNkljKLd7ORmZ16VYrtb7ZwCsv   
   n_/view?usp=sharing   
   >   
   >   
   > As the said circuit was working as I wanted with the ldr and buzzer, I   
   > built another of the same circuit.   
   >   
   > On this 2nd circuit, the led goes off when I adjust the 10k pot, but the   
   > sound does not. It does on the first circuit I built.   
   >   
   > Thanks   
      
   If anyone has replied to my post, I'm not seeing them.   
      
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