Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!cs.utexas.edu!usc!henry.jpl.nasa.gov!elroy.jpl.nasa.gov!hacgate!tcville!sed170!lee
From: lee@sed170.HAC.COM (John Lee)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Homebrew Genlocks
Keywords: Genlocks
Message-ID: <311@sed170.HAC.COM>
Date: 25 Aug 89 19:49:48 GMT
References: <1326@mcrware.UUCP> <11695@cit-vax.Caltech.Edu>
Reply-To: lee@sed170.UUCP (John Lee)
Organization: Hughes Aircraft Co., El Segundo, CA
Lines: 26

In article <11695@cit-vax.Caltech.Edu> stevel@tybalt.caltech.edu.UUCP (Steve Ludtke) writes:
[...good discussion of sync derivation problems deleted...]
>	The next thing to deal with is switching. The amiga has a handy
>output that switches when the color displayed is 0 (background). Hooking this
>up to a 4051 CMOS analog switch will do the switching pretty well.
[...]
>---------------------------------------------------------------------------
>Steve Ludtke
>stevel@tybalt.caltech.edu              ..!cit-vax!tybalt.caltech.edu!stevel
>stevel@citiago  (Bitnet)               
>72335,1537      (Compuserve)                          I DO ...

Hmmm.  I don't have my databook with me at the office (I'm a software engineer,
even though my diploma says EECS) but isn't the bandwidth on the 4051 too low
(~1MHz) for a video signal (>3Mhz)?  Or is that the (4021 | 4031, I forget)?
Other than that, assuming you can work out the cross-talk/noise problems,
it seems quite possible to build one as simply as you describe.  Why don't you
give it a shot with the National chip and tell us about it?

-------------------------------------------------------------------------------
Raining CATS and DOGS?  Join the RATS: Remote Amiga Teleconferencing System
	+--------+			John Lee
	| HUGHES |
	+--------+			ARPAnet: jhlee@hac2arpa.hac.com	
	Hughes Aircraft Company
The above opinions are those of the user and not of those of this machine.