MOTM

> Unfortunately, I don't quite understand this safety gap.  Can you explain
it
> further...?

The two clock pulses for BBDs should not ovelap. Even when you make
sure they won't overlap in your clock circuit, they might as soon as you
connect
the BBD. That's because of the BBD's input capacitance and the limited
current output of the clock circuit. Acts like a slew limiter.
You have to insert a "gap" between the two clock pulses, a small time when
none of them is on. The better your clock driver, the smaller the required
gap.

JH.