[sdiy] Video Synth...

[Tom Wiltshire]

On 21 Dec 2007, at 21:21, np wrote:
>
> For my video signal generator I need two sync-signals at relative  
> stable frequencies. VSync is at 50Hz (well - that's easy). HSync at  
> 15625 Hz.
>
> I did some math and found out that I can get both frequencies by  
> dividing down a 27Mhz crystal oscillator.

Why do you need to go so high? You could get 15625 by dividing a 1MHz  
crystal by 64. In fact, this frequency is half the MIDI baud rate, so  
pretty much anything that can generate a clock for a MIDI signal  
would be suitable. Lots of people use 500KHz oscs for this too.
Do you need both division ratios to be powers of two?

T.