/ / INTRODUCTION

Parts

• 8 ohm Speaker
• 1M potentiometer
• 555 Timer
• .01µF ceramic capacitor
• .1µF ceramic capacitor
• 10µF electrolytic capacitor
• 22K Ω resistor
• 10K Ω resistor
• 9 Volt battery

/ / Instructions

1. Here is the schematic and an image of the breadboard
   
   
   
   

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2. Build and test the circuit
   
   

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1. Free form solder the parts together:
   1. Connect a wire from pin 1 (This will be the GND line). Then connect pin 2 to the .1µF capacitor. The other side of the capacitor should go to GND
      
      
      

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   2. Connect pin 2 to pin 6. Make sure to not connect pins 1 and 2
      
      
      

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   3. Connect a wire from pin 8. This will be the power line. Connect pin 7 to a resistor. Connect the other side to the power line
      
      
      

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   4. Connect the leads from the battery clip to power and GND lines
      
      
      

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   5. Connect pins 6 to 7 with the resistor
      
      
      

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   6. Connect the electrolytic capacitor to pin 3. Connect the GND side of the capacitor to the red lead of the speaker. Connect the black lead of the speaker to the GND line
      
      
      

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   7. Connect the potentiometer to pin 4
      
      
      

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   8. Connect the LDR to the potentiometer
      
      
      

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   9. Test the circuit. If it works, hot glue it to prevent shorts
      
      
      

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2. Build an enclosure
   
   The LDR needs to be on the outside
   
   

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