| That's not an easy task at all !!
You have to know that the 15kHz or 37.5kHz are signals that eventually
deflect the electron beam in your CRT (Cathode Ray Tube) by way
of electrical currents. You need fairly hefty currents anyways and
the deflection coils would prevent you from going over a certain
frequency in a normal TV monitor.
Additionally, that small frequency of 50 or 70 Hz is quite important
also to watch. That's the frequency with which the picture gets
updated - only with a TV the beam writes only every second line
of one half of a picture, then skips to the top and writes the rest
of the picture. The beam does that skipping 50 times a second, but
the actual picture changes only 25 times a second.
Confused now ?
Anyways, the picture update frequency is most important in
considerations for ergonomical computer design.
In Europe the general rule now is to have more than 70 Hz , because
only these frequencies seem to have no adverse side effects on the
person using the equipment. (like stress, headache ...)
To top it all off, the higher your line frequency and your update
frequency, the higher will be the necessary video bandwidth because
that is the mathematical product of the two - and that is directly
related to the cost of the monitor.
So, in my opinion the Atari SM124 is a very good product for the
price - a TV monitor with the same features would be much more
expensive.
But your question was whether you could do one yourself - the answer
is no, unless youre very experienced in electronics.
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