Date   : Wed, 24 Oct 2007 00:43:01 +0200
From   : anders.carlsson@... (Anders Carlsson)
Subject: UM1233 TV modulators...

Jules Richardson wrote:

> Anyone know which input on the UM1233 is composite in and which is +5V?
> The junk one I have here looks as follows:
>
>          out
>          __
>       +-|  |-----------+
>       |                |
> in1 __|    top view    |
>       |                |
> in2 __|              O |
>       +----------------+

Is that the same RF modulator as found inside the BBC Micro, ZX Spectrum
and so on? In that case, I *think* "in1" is the video signal and "in2"
is the power source. That guess is based on that I recently modified
my ZX Spectrum 48K to output composite video, and the mod consists of
cutting the 5V and rerouting the video input so it goes directly to the
phono plug.

Don't take my word for granted though...

Regards

-- 
Anders Carlsson