[sdiy] Re: About this LC filter formula questions

[Ken Stone]

There is a half built one in my workshop at the moment. For a workable echo,
you need 20 metres of hose. I ahve 40, with multiple taps using electrets
set in T-pieces. To top it off, there is also a set of reeds being excited
by the same speaker, which should produce some interesting "resonant responses"

This method has been around for ages. Shcober Organs tried it before
settling on tape loops. The Time Cube is a commercial example, and numerous
experimentors have built their own.

Ken

>
>Here's a freaky idea:
>
>Build a "tube echo" with a large length of flexible plastic pipe, which has
>been rolled into a coil. Connect one end to a small box which contains a
>speaker. At several points along the pipe, drill a small hole and insert an
>electret microphone into the hole. Connect preamps (probably with some EQ)
>to each microphone. Then use your scanning circuitry to sweep back and
>forth among the various microphone signals. In other words, do the whole
>delay line with sound instead of an electrical transmission line simulation.
>
>How's that for an unusual vibrato-chorus design?
>
>One thing's for certain, it's sure to have an "analog" character to it.
>
>
>later,
>Glen Berry
>
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au  
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>