CV BBD (Was: [sdiy] repairing a BBD delay)

[René Schmitz]

Hi Karl and all,

Karl Ekdahl wrote:

> Couldn't i just replace the MN3101 with a VCO and use
> a counter to get half the frequency or is there any
> other magic supplied by the MN3101 that i don't know
> about?

You only need two antiphase signals, so sometimes one uses a flip-flop 
and divide. Or you can use an oscillator which already generates 
antiphase signals.

> Any examples of other people doing this highly
> appreciated!
> 
> Karl

Here are two examples of clocking circuits:

http://www.uni-bonn.de/~uzs159/bbdclock.gif
http://www.uni-bonn.de/~uzs159/bbd-clock.gif

I've sucessfully used the latter circuit to drive TDA1022s.
With a larger BBD (hence more capacitance as a load) one might
have to beef up the outputs with complementary push pull stages.

Note the odd way of powering the CMOS stuff here. Should match the 
powering of the BBD.

Cheers,
  René

-- 
uzs159 at uni-bonn.de
http://www.uni-bonn.de/~uzs159