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Yes, the buzzer it self and the frequency i picked is loud enough. In video i used 20kohm for R9 but in schema i left it 10kohm so following schema provides even louder sound.
Yes they are. And my next project will be shocking which do this 3 phase cricket chirping only by single ic.
Police Siren Circuit Using 555 Timer IC
Timer 555 Cricket ChirpingView Instructable »