s-video: how many volts does C to GND and Y to GND have ?
Hello,
I have given a plug with 25 pins, I know there must be a s-video signal on it, but I do not know on which pins. Can I find it with the digital volt meter, when the camera is turned on ?
- will the volt meter cause no harm to the camera ?
- what is a typical voltage between C-ground and chrominance and between Y-ground and luminance ?
Best regards, Sonja
I have given a plug with 25 pins, I know there must be a s-video signal on it, but I do not know on which pins. Can I find it with the digital volt meter, when the camera is turned on ?
- will the volt meter cause no harm to the camera ?
- what is a typical voltage between C-ground and chrominance and between Y-ground and luminance ?
Best regards, Sonja
SOLUTION
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ASKER
Hi Jenkins,
to your first comment: I indeed have to make an interface between the given 25 pin plug and the 4 pin plug you showed. But I see no info about expected voltage in the text.
your second comment: I know this, but unfortunately I have no access to the camera side. So I really have to decide given only the 25 pin output, while the camera is running.
Thank you for your answers - maybe you know more about the voltage to be expected ?
Sonja
to your first comment: I indeed have to make an interface between the given 25 pin plug and the 4 pin plug you showed. But I see no info about expected voltage in the text.
your second comment: I know this, but unfortunately I have no access to the camera side. So I really have to decide given only the 25 pin output, while the camera is running.
Thank you for your answers - maybe you know more about the voltage to be expected ?
Sonja
Well, your looking for around a 75ohm impedance and the maximum signal strength allowed by the FCC is 15.5dBmV for tv/catv so i would assume that the voltage your looking for is around that...
the voltage to expect at the end is dependent on the camera.
the voltage to expect at the end is dependent on the camera.
ASKER
Hi Jenkins,
what means "dBmV" ? How many volts would you expect ?
Sonja
what means "dBmV" ? How many volts would you expect ?
Sonja
I would say to look for between 5 - 8.4v
Sorry - mV
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ASKER
thank you, Callandor. In a image with average colors and average darkness: would you expect the two voltages YGnd-->Y and CGnd-->C to be both about the same, or would the first be 0.3 V and the second 0.7 ?
Sonja
Sonja
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http://www.tkk.fi/Misc/Electronics/circuits/svideo2cvideo.html