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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:[email protected]
ok,that's all l