555 Timer Circuit Diagram Police Siren



555-timer-schematic-police-siren

555 Timer Circuit Diagram Police Siren

This 555 timer police siren schematic diagram use 2 555 timer to produce an up-down wailing sound.

The first 555 is wired as a low-frequency oscillator to control the VOLTAGE CONTROL pin 5 of the second 555. The voltage shift on pin 5 causes the frequency of the second oscillator to rise and fall.




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