Was: programmable 16 step shift register?

[Tony Allgood]

Chris wrote:
It shouldn't take very much, but you may not be able to fit 'em in the
box when you're done. The BBD IC is run from a clock. All you need to do
is replace the existing oscillator with a square-wave output VCO. I
think the wilson delay is tuned to 1v/oct for the BBD clock - but
really, how important is that?

I used a 4046 for my VCO to drive my BBD circuits, these are good and cheap
but have a linear (sort of) V/Hz. I found that give the best effect, for
vibrato or chorus, the modulation of the VCO must be done by sine wave. A
triangle just does not sound nice. Probably something to do with uniform
rates of change in a tri wave.

BUT as Chris said these BBDs are very noisy,could use a compander, NE570?,
to help. Or perhaps put them before your final VCA...and when the BBDs
distort, yuk, nothing smooth about them at all!

Tony Allgood

Cumbria, UK

e-mail: oakley at enterprise.net