Ensemble Circuit Configuration Questions

[Rene Schmitz]

At 18:13 27.08.99 +0200, mbartkow at ET.PUT.Poznan.PL wrote:
>Dear all,
>
>I am following the discussion carefully since I plan to build such (possibly
>good sounding, no compromise) circuit using analogue circuits. First, I love
>the sonic effect, second I have an order for an analogue F/X from my friend 
>techno musician.

Hi Maciej, Sean and List!

I try to do something similar as well, maybe we should combine our efforts.
(I'm sure there are even more people interested..)
Just by coincidence, I have a circuit for a BBD clocking VCO on my bench
right now. It uses only a quarter of a 4093 and two transistors as active
devices. And a 4013 to get the out-of-phase-minimum-overlap clocks. Works
nice, from 2Hz to 2Mhz. I have yet to experiment with a linear current
source. Personally I'd patchpoint modularize the whole thing. (To use the
BBD lines seperately, Experiment with different random/control sources...)


>1) 120 degrees-

I think for fixed frequency generation of the three phase signal, the 4069
would be a good choice. One could maybe use their soft clipping for the
stabilization of the output amplitude. However it may be tricky to tune it
to different frequencies. Then using a QLFO will be the better choice IMO. 

>PS. Does anybody know what exactly are the lenghts of the delay lines used in
>vintage staff (especially Solina) ? MN3007 (1024 BBD stages) is acceptably
cheap,
>but MN3005 (4096 stages) seem to be unreasonably expensive (8 times the price
>of 3007). 

I use to call this "Bucket for the Buck ratio" (BFTBR ;-). Here the prices
for the MN3005 are insane. 50DM. For me the lowest BFTBR has the TDA1022,
512 stages.
Of course a longer register will allow higher clock frequencies for the
same delay, therefore improving SNR and aliasing. The question is rather
the maximum and minimum delay times for the delaylines. Sean, do you know
the figures?!

Bye
 René



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