Yet another BBD question...

[KA4HJH]

>The MN3004 is spec'ed for 10kHz - 100kHz. But in the Polysix they are
>clocked as high as 600kHz.

This is what I keep wondering about. This kind of educated-torture is 
a little beyond my experience, so if somebody has already figured it 
out...


>I did some hacks on a Polysic FX board (another one ...)

not ANOTHER one  8o


>, modified the
>clock and signal path that all BBDs can be swept from 8kHz to 600kHz
>with the trimmers on the board, and the outputs of two lines being
>added rather than one line + the direct signal.
>I haven't done in depth tests yet - it was early in the morning - but
>I'll go on later that week. BTW, where would one apply the feedback loop
>for resonance in such a flanger ? Around one BBD line only ? From
>the output of one to the input of both ? From the added outputs to both
>inputs ? Or feed back the difference while using the sum for the output ?

If you're using a fixed delay for the "straight" signal the other one 
is the actual "delay". But who knows what weird things might happen?


>Lot of things to try.

Try them all. But +/- feedback on the variable delay is the obvious 
place to start.

Terry Bowman, KA4HJH
"The Mac Doctor"

ICQ: 45652354