I bought ( in error ) 40 piezo buzzers.. 86 db they turned up but!!! No internal circuitry... So no worky!!
I made this
and the buzzer buzzed!! Yeah! But just audible... I went to change the cap ( as its the wrong size ) and low and behold nearly 2.5Khz on the buzzer and quite loud... So 12v in.. 10k resistor.. common TTL NPN and piezo??? How is it oscilating?
I made this
and the buzzer buzzed!! Yeah! But just audible... I went to change the cap ( as its the wrong size ) and low and behold nearly 2.5Khz on the buzzer and quite loud... So 12v in.. 10k resistor.. common TTL NPN and piezo??? How is it oscilating?