Quote:
Originally Posted by FERNSEH
For discussion later, the circuit of the sync separator and frame pulse integrator and clipper.
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The filter capacitors were not as large as I remembered but the resistor is too large. I would recommend as a trial make the 100k about 22k or thereabouts by tacking a resistor across it and after that if no improvement, try replacing the diode with a 22k resistor.
If that doesn't work, disable the vertical oscillator and look at the separated V sync pulse on the scope to see if has been suitably separated and filtered.