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Old July 18th 20, 03:02 AM posted to alt.home.repair
Clare Snyder Clare Snyder is offline
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First recorded activity by DIYBanter: Nov 2017
Posts: 3,953
Default security cameras - question


I have a question maybe one of you fine folks would have an answer
for.
If I have one video monitor and several video cameras - regular hard
wired composite video - can I connect say, 3 cameras in parallel and
switch power between the three cameras to scan from one camera to the
next in sequence? I tried it with 2 backup cameras and no magic smoke
came out and they seemed to work just fine (for the couple of minutes
I had them connected). I even tried powering both at the same time and
the monitor just lost the signal. When I disconnected one, the other
came back up on the screen immediately. This would tend to indicate
the cameras have tristate outputs? Or at least open collector - when
not powered the output is disconnected???