A
[email protected]
- Jan 1, 1970
- 0
In the days of the first color NTSC TVs, a common practice was to drive
the color crystal directly with the incoming colorburst and then let
the crystal coast for the rest of the line.
My questions are...
How exactly did they drive the crystal? Was there something special
about those crystals that let them be driven? (Those cans were HUGE
back then, was it a different material, cut, etc?)
What if I took a modern hc-49 crystal and set it up in the classic
logic inverter oscillator circuit, but instead of an inverter I took a
NOR gate and periodically pulsed the other input of the NOR gate with a
narrow sync signal?
Would the crystal eventually get 'locked' to the phase of the incoming
sync?
TIA
the color crystal directly with the incoming colorburst and then let
the crystal coast for the rest of the line.
My questions are...
How exactly did they drive the crystal? Was there something special
about those crystals that let them be driven? (Those cans were HUGE
back then, was it a different material, cut, etc?)
What if I took a modern hc-49 crystal and set it up in the classic
logic inverter oscillator circuit, but instead of an inverter I took a
NOR gate and periodically pulsed the other input of the NOR gate with a
narrow sync signal?
Would the crystal eventually get 'locked' to the phase of the incoming
sync?
TIA