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wasssup1990
Nobel Prize Winner
A Land Down Under
2261 Posts |
 Posted - Feb 17 2010 : 09:33:24 AM
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If you have an oscilloscope switch the probe to high-impedance and place the probe on the composite video cable coming from the source and make sure the T.V. is plugged into one of the split offs from the splitter. Check the signal level on the scope, then plug the Video Activated Relay into the second split off on the splitter. Check the signal level on the scope again and compare the differences. I suspect the composite video input on your Video Activated Relay has a low impedance which is lowering the signal level coming from the source which the T.V. interprets as "No Signal" since the composite video level it is receiving is below an appropriate minimum threshold the T.V. was designed for.
Solution:
Try a higher value for R1. This will increase the circuit's input impedance and will not dampen the source signal as much. If you increase R1 too much your circuit won't activate the relay. |
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion. |
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Video Activated Relay
