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Block diagram. Any corrections?

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  • Block diagram. Any corrections?


  • #2
    Re: Block diagram. Any corrections?

    Looks right, 'cept maybe the divider frequencies. I think both are div-7, around 1.4kHz.

    - Carl

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    • #3
      Re: Block diagram.

      The Q1 output should be high every other positive cycle, and end up as div by 2 (5KHz).
      The others or'ed with the diodes takes a little more thought, however the product spec reads 630Hz.

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      • #4
        Re: Block diagram.

        Yup, you're right. I forgot that it's a binary divider. Q2-Q4 are diode ANDed, which creates a short duty cycle pulse. The frequency is equal to the lowest divide rate (fclk/16) and the pulse width is set by the highest divide rate. The middle diode is not even needed.

        So for a 10kHz input, the audio f is 625Hz, with a 12.5% duty cycle. Tweaking the duty cycle like this, sets the "pleasantness" of the audio tone.

        - Carl

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        • #5
          I wondered about the diodes...




          Yes, it must just sound better. What about the phase shifts going to the analog switches? The numbers are what the scope measured.

          Anyway, here's a diagram for the signals at the binary counter.

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          • #6
            Re: Block diagram. Any corrections?

            Hi Goodrat

            I do same simulations in pspice about phase shifter circuit of bandido but i have a very different risults.
            I have:
            GB +60°,+90°
            disc -10°,-110°
            Are yours data misured on real circuit or came from simulation?
            I'm not a spice guru so may be i do same errors.
            Bye Max

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