How feasible to add composite video or s-video to late '90s tv?

[Don Taylor]

Bought a 27" RCA television in the mid to late '90s, but it was a
cheaper model without a composite or s-video input.

Now as the number of video gadgets piles up I'm wondering whether
it would be feasible to add a video input to this set.

Disclaimers: I've got a reasonable amount of electronics experience,
understand high voltage (especially after getting belted with a bolt
from an operating big old console set I was working on 25 years ago)
and am just wondering whether there is information out there that
would make this a feasible project or not.

thanks
(email address is valid, been "dont" on the net since before there was spam)

 

[Watson A.Name - Watt Sun, Dark Remover]

Bought a 27" RCA television in the mid to late '90s, but it was a
cheaper model without a composite or s-video input.

Now as the number of video gadgets piles up I'm wondering whether
it would be feasible to add a video input to this set.

Disclaimers: I've got a reasonable amount of electronics experience,
understand high voltage (especially after getting belted with a bolt
from an operating big old console set I was working on 25 years ago)
and am just wondering whether there is information out there that
would make this a feasible project or not.

You can buy a RF modulator at Rat Shack for $30, and it has both the
composite and s-video input jacks. You may also need to buy cables,
so it may cost a bit more.

I've been dinking around with the RF units from old VCRs. All you
have to do is put one inline with the antenna input of the TV, and put
your video and 5VDC supply voltage on it. Most of them have simple
pinouts (5 pins), and take 5VDC. Older ones may take a higher
voltage. Of the three or four that I've connected to the TV, they all
have decent picture quality and are free, if you can find an old VCR.
The best ones will pass thru the antenna when off, and disconnect the
antenna and enable the RF on Ch. 3 or 4 when on.

Hey, there's nothing wrong with connecting a video jack to the TV
internally, but why bother when you can do it with an RF modulator.

thanks
(email address is valid, been "dont" on the net since before there was spam)

--
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[Don Taylor]

"Don Taylor" wrote ...

Seems unlikely as most of those receivers were likely
designed with "hot chassis" since they didn't have to bring
any electrical connections to the outside (save the antenna
which is transformer-coupled).

Someone who I thought was pretty competent in the electronics
business told me that the old "hot chassis" risk went away when
cost cutting in television power supplies for tubes led to hot
chassis then changed over to cost cutting in televisions led to
everything being done with a couple of ic's that only used 5 volts.

True? False?

Thanks

 

[Watson A.Name - Watt Sun, Dark Remover]

...

Not in any TV receiver/monitor I've ever seen inside of.
Plenty of high voltages and minimalistic power supplies
that run directly off the power line.

All the PSes I've seen recently are SMPSes, and they are well
insulated from the incoming AC line. I see grooves or slots cut into
the PC board in such places as between the hot side and the chassis
side of the optoisolator. They take isolation seriously, with
hipotted transformers, etc.


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###Got a Question about ELECTRONICS? Check HERE First:###
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My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@

 

[Watson A.Name - Watt Sun, Dark Remover]

"Watson A.Name wrote ...

Dunno about YOU, but I surely don't feel like putting
Mr. Taylor's life and limb at risk on the *chance* that
he *might* have a "safe" model. (Which seems unlikely
given its vintage.)

He is asking about something that even professionals find
so risky that they will virtually always find a workaround
(like an RF modulator). Advising an amateur to "go for it"
is highly irresponsible IMHO.

I agree; point taken. As far as I know, there are regulations
governing this, so it's wise to check first before risking the chance
of shock.

--
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###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@