BBD-MN3010 and MN3011- is a MN3101 clock necessary?

[Tony Allgood]

>...the old standby is to make the clock run a 2X the frequency you
need, and then
use a 4013 D flip-flop as a divide by 2 circuit. The Q and notQ outputs
are non-overlapping.

Although this may seem true, I do not think they are non overlapping
when you drive the BBD chip. Capacitance in the BBD's clock inputs will
produce a certain degree of overlap. I think you really need some dead
time between the two trains. I have a chorus unit made from two TDA1022s
and I used a 4013 to derive my clocks. I will be redoing this board at
some time to see if the amount of dead time can have a significant
effect on the amount of noise. Currently, the unit is not very useful
since it is too noisy. Its not companded either, which doesn't help
matters.

Regards,

Tony Allgood  Penrith, Cumbria, UK

Modular synth circuits, TB303 clone and Filter Rack

http://www.techrepairs.freeserve.co.uk/projects.htm