Generating Video Sync Pulses

[Robert Knight]

Can anyone advise me on where to find information on generating video
sync pulses for PAL television systems, without using PIC chips?

The basic aim of the project I am working on is to take an analog
voltage from a sensor, convert it to a bcd number and then display
that number on a TV screen.

To start with I tried using a NOR gate astable (CMOS) to generate the
horizontal sync pulses, but I may try a counter instead as that will
hopefully be more accurate.

In order to generate the vertical sync signal, I have read that I can
just send out 20 blank video lines with the horizontal sync inverted.
Is this correct? (I would prefer to use non-interlaced display if
possible)

The signal I need to generate is a standard composite video signal (So
I don't need to encode it for transmission).

I did look into the possibility of using a sync signal generator chip,
but the only one I could find (from Fairchild I believe) is far too
complex for my needs.

 

[Electric dabbler]

Hi Robert,

The SAA1043P from Philips was a great chip for doing this kind of thing, it
can generate a fully interlaced sync pulse and a host of other video timing
signals with just a couple of other components. Very probably obsolete now
however.

Philip

 

[RobK]

Thanks Philip,

Fortunately I managed to find just such a chip. The reason I cannot
use PIC is as this is an A-Level electronics project, and marks are
awarded for use of hardware rather than software.

Regards,
Robert.

Electric dabbler wrote:

Hi Robert,

The SAA1043P from Philips was a great chip for doing this kind of
thing, it
can generate a fully interlaced sync pulse and a host of other video
timing
signals with just a couple of other components. Very probably
obsolete now
however.

Philip