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ne555 timer with sound frequency

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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 :D :D 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.
 
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