[sdiy] removing dc offset

[gregory zifcak]

this is what i was doing, but i have to use a cutoff frequency of about 300 
hz to substantially reduce the dc. i'm assuming this is because the 6db 
slope is just not steep enough.
i guess that because the toy originally used a small internal speaker, they 
didn't need to worry about the dc. i've added an output and i'm worried 
about damaging speakers with the thump.
>
>Are you using a capacitor in series with the output as a DC blocking
>capacitor?  It needs to be larger for lower frequencies to pass through
>it.  It's really a simple highpass filter, so the larger the cap, the
>lower the cutoff.
>
> >--- gregory zifcak <zifcak at hotmail.com> wrote:
> >
> >> hi,
> >> i am modifying a toy that has very rich bass, but due to the fact
> >> that it is
> >> run from a single battery supply, there is a dc offset. i've tried
> >> filtering
> >> this with caps of various sizes, but i can't seem to get rid of the
> >> offset
> >> without getting rid of the bass. is there a simple way to do this?
> >> thanks for any suggestions,
> >> greg
> >>
> >>
> >>
> >
> >
> >
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