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Running the VideoFrameCapture.pde sketch works great with the Output Select switch in “Overlay” mode. But switching it to “Sync Only” gives no output instead of the 1-bit image.
Am I missing something obvious? Moving the jumper seems to have no effect on the output signal.
Did you adjust the threshold potentiometer? You’ll need to adjust it when switching between output select modes.
@Michael wrote:
Did you adjust the threshold potentiometer? You’ll need to adjust it when switching between output select modes.
You mean the big knob and not the trimpot?
It’s not clear to why that would be needed if the input signal stays the same.Yes, the potentiometer with the long stem. It is for adjusting the threshold.
The input signal is the same, but when connected to the TV, there is 75 ohms of resistance between signal and ground in the TV, so when you disconnect the TV (with the switch set to sync only), it changes the electrical characteristics.
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