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From: Richard Lamb
X-Mailer: Mozilla 4.72 [en]C-CCK-MCD NSCPCD472 (Win95; U)
Subject: Re: RS-232 controlled video switch
References: <firstname.lastname@example.org> <email@example.com>
NNTP-Posting-Date: Tue, 14 Jan 2003 23:37:42 EST
Organization: Prodigy Internet http://www.prodigy.com
Date: Wed, 15 Jan 2003 04:37:42 GMT
There is a Maxum chip specifically for video switching.
Little 8 pin DIP does 2 in 1 out.
Three of the things gives you dual-to-one R G B switching.
Add a little logic to pass the digital parts.
I used a dual 4 path multiplexer chip. 74LS something.
(it's been a few years)
Hook it up via a parallel port by flipping a single bit.
Cheap and simple solution...
Si Ballenger wrote:
> On 14 Jan 2003 15:46:01 -0800, firstname.lastname@example.org (Hobichu)
> >I'd like to build an inexpensive RS-232 controlled video switch, to
> >control (switch) multiple camera feeds into a single PC capture card
> >(all RCA jacks). I am an electronics novice and am looking for
> >I know there are quite a few commercial solutions out there, but I am
> >hoping to build my own.
> The simplest serial port switcher is probably made rom a 4017B
> decade chip. This can sequentially switch up to 10 cams.
> Allelectronics has a "LED chaser" kit for ~$7 that would make a
> good base for the switcher. I've done this below by echoing to
> the com port to make the clock pin on the chip high and switch
> the cams. I use an NPN transistors to switch the video. The
> bottom link is my "El Cheapo" parallel port switcher. No external
> power needed, and all parts at Radio Shack. Bottom link is "El
> Cheapo" in action.
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