ne555 timer with sound frequency

:roll: hi,
I just wanted to know how NE555 timer works sound freuqency man.

It can make any tone that you can hear.

Link.

thansk, but any 1 knows how 555 timer works with pest reppeller

the explaination

8) hai to
i'm arief from indonesia
i build TV transmitter with test tone
i use MC1455 similar with NE555
sound frequency that human can hear is range in 20Hz until 20kHz.
using MC1455 i made in astable multivibrator mode, the output is in pulse waveform
i made it variable from 1kHz until 30kHz. you can change the range by changing the variabel resistor. i've the schematic, if u very interest in it you can contact me at email:batigol_arief@yahoo.com
ok,that's all l

thanx but i never heard of another chip that can do similar job as 555 timer. I wanted to know if ultra sonic frequency can used as didgital frequency.