Astable 555 timer buzzer active passive using light dependent resistor LDR circuit electronics

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Buzzer controlled by 555 timer output with light dependent resistor (LDR) timing. Step by step build using active and passive buzzers, and various capacitors to help set the frequencies.

#555 #buzzer #LDR
  1. electronzapdotcom
  2. 555
  3. timer
  4. electronics
  5. buzzer
  6. active
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Hey, I tried making these types of photoresistor oscillators but the tone changes with the voltage and different types of 555 chips give better or worse results but some of them overheat mabye they all got damaged somehow but I think the older early 2000’s 555 chips are the most reliable

dampandrew
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I tried this. The active buzzer goes off continuously even without the photo conductor connected. What seems to be the problem?

villages