On 16/04/2015 14:11, John Rehwinkel wrote:
I'm also working on an ongoing project to use an old monoscope tube as
a character generator to display nicely formed characters on a small
CRT. This could be the basis for a 4/5/6LW
project, including some fun effects like stretching letters vertically
or horizontally, and moving them around. I'm on about the sixth
redesign (LT1172 switching regulator driving a CCFL
inverter with a voltage doubler) of the monoscope power supply at this
point.
I've built a character display on a single 1" CRT (DH3-91) with the idea
of using several in parallel to make a multi CRT FLW+. Project was
sidelined by other projects...
FLW on a 1" CRT is easy
And on a 3" CRT, 6 letters (or more) is practicable. My current scope
clock project uses a 5" CRT so I was looking for a much larger word list
and probably some form of scrolling proverbs perhaps. I'm aiming to
store the words and proverbs on a small removable SD card so updating
the library does not involve reprogramming the micro, just updating the
text files on the SD card. In terms of a CRT, it is a good use for a
rectangular CRT which fits well displaying letters. To get nicely
formed letters I'm using the sine/cosine drawing method (i.e. David
Forbes scope clock).
Grahame
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