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nuckolls.bob(at)aeroelect
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 Posted: Sat Dec 02, 2017 8:49 am Post subject: Constructing an automatic RCA video camera feed splitter |
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Got a peek at the video out of the $7 camera. They sent
me a PAL as opposed to NTSC but there's no reqason to believe
the outputs are not similarly organized.
the outpout is DC stable with negative tip of sync
clamped about 20mv above ground. Video output into
75 ohm load is 1v pk-pk.
[img]cid:7.1.0.9.0.20171202104548.0573d0a8(at)aeroelectric.com.0[/img]
Bob . . .
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Eric Page
Joined: 15 Feb 2017
Posts: 245
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| Posted: Sat Dec 02, 2017 6:30 pm Post subject: Re: Constructing an automatic RCA video camera feed splitter |
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Beautiful. It looks like our mux design with a single positive supply should work fine. I'll get the ball rolling on a prototype, which I'll send to Alec to stuff with a programmed PIC.
Alec: Should I add a couple of PIC12F683s to my parts order, or do you already have them on hand?
Eric
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nuckolls.bob(at)aeroelect
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| Posted: Mon Dec 04, 2017 8:18 am Post subject: Constructing an automatic RCA video camera feed splitter |
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A D-sub housing I've found quite useful is the
956 series devices from NorComp
https://goo.gl/54a6S9
they have an inside height of 0.570 and will allow
you to socket a chip on the far end . . . the board
deflects off centerline by about 0.050
These backshells have a partition that is easily
removed with a pair of duck-bill pliers.
[img]cid:.0[/img]
[img]cid:.1[/img][/b]
I've only used the 15 pin shells . . . I think
the 25 pin devices are of similar configuration.
I use solder-cup connectors. By chamfering the corners
of the end between the pins, it presses between
them quit nicely and fixtures the parts for soldering.
Bob . . .
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Eric Page
Joined: 15 Feb 2017
Posts: 245
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| Posted: Mon Dec 04, 2017 3:59 pm Post subject: Re: Constructing an automatic RCA video camera feed splitt |
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| nuckolls.bob(at)aeroelect wrote: | | A D-sub housing I've found quite useful is the 956 series devices from NorComp. They have an inside height of 0.570 and will allow you to socket a chip on the far end . . . the board deflects off centerline by about 0.050. |
Bob, your timing is impeccable. I turned on the computer to order some parts and saw your post. I'll get the 956-series backshell. I was looking at NorComp's 983-series, but yours looks nearly identical for interior volume and is 1/4 the cost.
Once I have the parts I'll do a quick cardboard template of the PCB before I order those, to be sure they'll fit.
| Quote: | | I use solder-cup connectors. By chamfering the corners of the end between the pins, it presses between them quite nicely and fixtures the parts for soldering. |
That's the plan. I looked for a right angle through-hole connector to gain some vertical space, but the ones that will fit a backshell start at >$10 ea.
Eric
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