Robonz wrote:Harry, I am not that familiar with the circuit. The first stage looks good for sure. I don't know your electronics abilities so this may be obvious. Make sure you put a 0.1uF capacitor across pin 4 and 7 on (close to) each IC to keep the supply noise to a minimum, this will avoid false sync signals. Also add 47uF across the 12V on your circuit.
Cheers
Keith
I started working onit today theres a lot of ways to go on this project but i think making the video signal will finish off the PMT flying spot camera and i could test the video on the lower line rates pretty much plus record it post up and share .
The circuit is a club circuit i am pretty sure its one Klass has designed i have used it a few times last on the PMT nipkow camera last year and it worked fine on my modified version ...i used at first the transistor to pins 1 and 8 on ic 2 for the sync but found inputting to pin 2 via a 120k resistance dropping the sync pulse level it worked better .
Yes decoupling caps will be added to the circuit ....still have to add a monostable for pulse width control for correct sync width see if i can fit on the little board i am using ...
i had room on boards in the PMT case for this circuit but i need to test this out side the case for correct level adjustments then i can mount it inside .
Thanks for the advice i will reduce circuit noise .
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.