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Can I use a voltmeter to help find audio and video signals from a circuitboard?
My car's headrest DVD controller box has a 10-pin connector that has audio out and video out. Unfortunately, they don't sell the wire harness for that connector and they won't tell you which pins serve what function. I need to determine which pins are for audio out (right and left) and video out. Audio and video ground should be easy to find, but I was wondering if I can use a voltmeter to help find the + audio and video pins. Approx how much voltage shoudl I expect to see from those pins with a steady stream of video and sound?
2 Answers
- billrussell42Lv 71 decade agoFavorite Answer
voltage levels could be anywhere between 0.1 and 10 volts.
I'd watch the level for changes while listening to the audio. If you see it change to match the music, then you have the audio ones. The video would have to be by trial and error. The problem with video is you don't know what kind of video signal it is. Actually, the video may well be three wires, for the 3 component signals. Or it may correspond to some other internal video standard.
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- 1 decade ago
the appropriate tool for this would be a oscilloscope !
the problem is that you dont know what video system they are using and video signals are quite high in frequency so your voltmeter may not give you a indication at all !
The audio you could theoretically find with a AC Voltmeter but the levels are depending on several factors and can be from a few millivolt up to 10V