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I need adjustable frequencies and decibel circuit

Question asked by clubmed7 in #Electronics on Sep 11, 2009
clubmed7 · Sep 11, 2009
hello everyone..
can show me the frequencies and decibel circuit that build with 555timer or other component that produce tone connected to earphone with battery 9V supply..
i gonna die thinking this circuit..
please help me.. Posted in: #Electronics

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