Home made Video - RF using old VCR Modulator

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Jonathan Hedges - 27 Apr 2005 20:34 GMT

I would like to build a device to connect a CCTV Camera to a TV using an old
VCR Modulator, does anyone one have a svhematic of this - I remember seeing
a circuit a few years back but can't find one now.

Cheers.

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Tomi Holger Engdahl - 28 Apr 2005 10:17 GMT

> I would like to build a device to connect a CCTV Camera to a TV using an old
> VCR Modulator, does anyone one have a svhematic of this - I remember seeing
> a circuit a few years back but can't find one now.

The VCR modulators are generally small metal boxes with several
connection in then. The pinoput of those can vary, but generally
the basic functionlity is the same. Typically the case is used
as ground for power and signals. One pin is for modulaor power
(usually in 5V to 12V range, can very between models), then there
is one soudn output pin (typically directly suitable for consumer
line level audio) and one video input pin for video (sutiable
for standard composite video). Just connect the power and the needed
signals, and you should get a basic VCR modulator to work nicely.
I have done this to several video modulators. Before removing the
box from old VCR I have traced which pin is which and what is
the right oprating voltage. Then just done the wiring.

I have collected some links to vidoe modulator circuits at
http://www.epanorama.net/links/videocircuits.html#modulator

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Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web links and documents at
http://www.epanorama.net/

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Electronics Forum / Electronics / April 2005

Home made Video - RF using old VCR Modulator