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Path: utzoo!linus!philabs!cmcl2!seismo!columbia!cucca!mike
From: mike@cucca.UUCP (Mike Ardai)
Newsgroups: net.analog
Subject: Re: Adding Video Input to a TV Receiver
Message-ID: <154@cucca.UUCP>
Date: Sun, 17-Nov-85 15:54:29 EST
Article-I.D.: cucca.154
Posted: Sun Nov 17 15:54:29 1985
Date-Received: Thu, 21-Nov-85 07:36:21 EST
References: <6263@amdcad.UUCP> <2100004@uicsl>
Reply-To: mike@cucca.UUCP (Mike Ardai)
Organization: Columbia University Center for Computing Activities
Lines: 12


You can still add a video input to a hot-chassis set, you just have
to be careful.  The easiest way around this is to add an isolation 
transformer to the AC line, and make sure the set can not be accidentally
powered up without it.  Alternatively, you could use an optocoupler
to isolate the incomming video signal.  Just don't let the signal's
ground come into contact with the set's ground.  I believe there was
a circuit in Radio-Electronics (or maybe Modern...) a few years back
that did it this way.

/Michael L. Ardai
...!seismo!columbia!cucca!mike