Mike Keitz wrote:

> >Easiest is to use a National Semiconductor LM1881 Sync Separator
> which
>
> If you have $6.00 to kill, that is.  Sync can be detected with a
> single
> transistor but it is tricky.  A PIC can analyze a composite sync
> signal
> and recognize the various parts.  If the transistor is an NPN, connect
>
> the emitter to ground and couple positive-sync video to the base
> through
> a capacitor.  DC bias for the base is supplied through a large
> resistor
> so the transistor is cut off all the time except during the sync
> pulses.
> Take the output from the collector with a pull-up resistor.  The
> circuit
> is an overdriven, marginally biased amplifier with no feedback.

ok, thanks, i'll try that, this seems to be compatible with my wallet =)