[sdiy] Re: About this LC filter formula questions

[harrybissell]

About the cross sectional area of the tube...

I think that you want a small diameter tube... so that the waves must go
'down'
the tube, and not bounce side to side.  Its obvious that low frequencies
will go
straight... but high frequencies could bounce. It will have to do with
'some' wavelength
of sound (in air)... but if its a full wave, 1/2 wave, 1/4 wave... who
knows.  I'm thinking
it should be less than 1/2 wave in diameter at the highest frequency.

Also the line should probably be terminated in some acoustic dead
mass... so that there is
not reflections or standing waves....

Yes... get a BBD !!!!   :^P

H^) harry

"There ARE some things worse than a BBD....  death is not among them !"

The Peasant wrote:

>
> > I found that my audio frequency unit made a lot of noise
> > (source) and received a
> > lot
> > of noise...  I considered it a failure and moved on.
>
> WOW, this sounds just like my ex-wife!
>
> > I
> > suppose the idea could
> > be made to
> > work better, but its a far cry from tape, bbd, or digital
> > solutions.
>
> Worse than BBDs!!????!!!!! Say it isn't so, Harry!!
>
> > Maybe we should turn the project over to the Electric
> > Peasant, who excels in
> > such
> > low-tech enterprises.  (see the slinky reverb for
> > example).  ;^P
>
> I've always wanted to experiment with injecting audio into
> a network of various resonant pipes and containers and
> installing microphones in different locations, but there
> are just too many other projects on the go here right now.
>
> If you really want to warp sound, put a small microphone as
> far inside a large sea shell as you can get it. Put the
> whole thing in a sound-proofed box with a speaker, and have
> fun!
>
> Take care,
> Doug
> ______________________
> The Electronic Peasant
>
> www.electronicpeasant.com