[sdiy] equalizer

[cheater cheater]

On 10/7/05, Seb Francis <seb at burnit.co.uk> wrote:
>Sounds like you need to use combinations of high-pass / low-pass filters
>to get total-kill, rather than just EQ cut.

You are totally right.

On 10/7/05, Amos <controlvoltage at gmail.com> wrote:
> I'm a little rusty on my filter architecture right now... but a band-stop
> filter should be just as easy as a bandpass filter, as it's basically the
> same thing from a different perspective.  I remember that a cheesy way to
> increase the Q of your filter is to use an identical one in series... you
> can gang them to the same controls, and then I think total band kill is a
> definite possibility.  For some reason most of the band-stop/bandpass
> filters I can think of rely on inductors.... but there must be a cheaper R/C
> version of the same thing, I just can't think of it.  I'm away from all my
> books right now.  And actually, should probably get back to work... ;-)
>

No, a typical band pass/reject filter won't do - it'll "kill" just the
center frequency. The rest of the dip won't be that big.

Cheers,
D. 8)


>
> On 10/6/05, cheater cheater <cheater00 at gmail.com > wrote:
> > Tempting! It seems to have nice features.
> > However, I'm not sure if it has the feature i need most...
> > can it totally cut ("kill") each of its bands?
> >
> > Best regards,
> >
> > Damian
> >
> > On 10/6/05, ken mosley <keninverse at gmail.com> wrote:
> > > sorry hit send way too fast:
> > >
> > > how about the Calreq pq1549 project at the gyraf audio site:
> > > http://gyraf.dk/gy_pd/calreq/calrec.htm
> > >
> > > PCBs can be purchased from gustav here:
> > >
> http://prodigy-pro.com/forum/viewtopic.php?t=233&sid=ef77164249ee072a50c4ad8318d132fa
> > >
> > >
> > >
> > > ken m.
> > >
> > > On 10/6/05, ken mosley <keninverse at gmail.com> wrote:
> > > >
> > > >
> > > >
> > > >
> > > > On 10/5/05, cheater cheater < cheater00 at gmail.com > wrote:
> > > > > yes!
> > > > > schematics anyone? :>>
> > > > >
> > > > > On 10/5/05, dustin sedlacek < dustin.sedlacek at gmail.com> wrote:
> > > > > > i personally would love to have a EQ killer or at least know how
> to
> > > build
> > > > > > one , thats a really cool unit i think
> > > > > >
> > > > > >
> > > > > > On 10/4/05, cheater cheater < cheater00 at gmail.com> wrote:
> > > > > > > Hey,
> > > > > > > very interesting find indeed!
> > > > > > > $199 is definitely prohibitive for me :(
> > > > > > >
> > > > > > > On 10/4/05, Danjel van Tijn < syntheticdan at gmail.com > wrote:
> > > > > > > > Have you ever looked at the electrix EQ Killer? I highly
> recomend
> > > > > > > > incorporatng that design into a DJ mixer. You could actually
> > > reverse
> > > > > > > > enegineer one if you got it (not such complicated circuitry)
> > > > > > > >
> > > > > > > > Cheers,
> > > > > > > >      Danjel
> > > > > > > >
> > > > > > > >
> > > > > > > > On 10/4/05, cheater cheater < cheater00 at gmail.com > wrote:
> > > > > > > > > Hi guys,
> > > > > > > > >
> > > > > > > > > I'm looking to build my own DJ mixer [as, frankly, nothing
> on
> > > the
> > > > > > > > > market is anywhere near what I'm looking for.... :( ]
> > > > > > > > >
> > > > > > > > > the first step would be to build a good equalizer: something
> > > that's
> > > > > > > > > four-band and can totally cut out each one of them. I'm
> looking
> > > for
> > > > > > > > > the same kind of thing that's in, for example, the Pioneer
> > > DJM-600
> > > > > > > > > (this one's 3-band, though), or the Vestax DCR-1200 PRO
> (which
> > > is a
> > > > > > > > > stand-alone equalizer).
> > > > > > > > > The Pioneer's EQ, for example, drops the whole band to -36
> dB.
> > > Without
> > > > > > > > > weird resonance. Nice!
> > > > > > > > > I haven't personally used the DCR-1200 PRO, but from
> > > stories&tales it
> > > > > > > > > seems it's the thing I'd want in my mixer.
> > > > > > > > > No, I'm not buying 6 of those >:(    ;)
> > > > > > > > >
> > > > > > > > > I've searched the archives, but not come up with a lot of
> > > stuff....
> > > > > > > > > some nice reads queued, though :)
> > > > > > > > >
> > > > > > > > > If anyone could point me in the right direction, perhaps
> assist
> > > me...
> > > > > > > > > [I've never made a complicated circuit like that, but I'm
> > > definitely
> > > > > > > > > NOT shy of my soldering iron ;) ]
> > > > > > > > >
> > > > > > > > > Best regards to everyone,
> > > > > > > > >
> > > > > > > > > Damian
> > > > > > > > >
> > > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > --
> > > > > > Dustin
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
>