--- In Doepfer_a100@yahoogroups.com , "Silas Johansen" <sijodk@...> wrote:

>
> Have a look at the circuit layout on
>

http://www.musicfromouterspace.com/analogsynth/YOUR_FIRST_SYNTH/YOUR_FIRST_SYNTH.html-

> the project in itself is a nice exercise in building synth circuitry,
> although the end product is of limited use musically (unless you

need bleeps

> and bloops that doesn't sync to anything other than the circuits lfo).
>
> Or for a direct link to the image in case you're unsure of which one I'm
> talking about:
>

http://www.musicfromouterspace.com/analogsynth/YOUR_FIRST_SYNTH/your_first_synth.gif

>
> Everything to the right of the dotted line is the filter section -

pretty

> simple with no CV control but fairly easy to build. I'm not sure how

this

> filter would respond to modular level signals, though, as I built

the entire

> circuit. Maybe somebody with more DIY experience might be able to

tell you

> based on the parts values and design.
>
> On 9/18/07, Stu Grimshaw <grimshaw@...> wrote:
> >
> > Hi group,
> >
> > working with the a188 bbd, i'm kind of hand-tied by the fact that i
> > need a filter (of which i only have two) to remove the clock signal
> > from the echoes produced.
> >
> > so i need to buy another one, or do i is there an easy way to build
> > a fixed freq lpf it's easy enough on the guitar, i.e. a passive
> > circuit, but what's the score with all this active circuitry
> >
> > any help or advice greatly appreciated.
> >
> > stu
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>

HI,
My answer is not the one you expect, i'm not an electronician, but I
don't use a LPF to avoid the clock noise because it's also suppress a
lot of frequencies i want to keep in.
In fact i use a notch filter ( the A121 one ) and here, all is ok, the
clock noise disapears and the high frequency are still there. Perhaps
you can try that and choose to DIY a notch filter.
My one per cent.
Patate le mage