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Question about 567 Tone Decoder

Discussion in 'General Electronics Discussion' started by kong, Jun 21, 2013.

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  1. kong


    Sep 26, 2010
    Been experimenting with the 567 tone decoder. Using a 555 timer chip to produce a tone of 1 khz, and a wire connecting the output of the 555 to the 567 input.

    R2 on the 555 is a 50k variable, what I wanted to do is to adjust R2 until the light I have connected to the 567 goes out, indicating the wrong frequency.

    I assume this has something to do with the bandwidth and I know that corresponds to C2, (pin 1 to ground on 567), but not sure how to calculate a narrow bandwidth.

    I also think it has something to do with Vin, and somehow the amplitude of the input signal also matters, but I'm fuzzy on this.

    I don't have/have access to an oscilloscope.

    Any clarification would be greatly appreciated. Thanks, G
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