Re: Apple Graphics Tablet

[Michael J. Mahon <mjmahon@aol.com>]

On Tue, 19 Jun 2012, Alex Freed wrote:

On 6/19/2012 8:37 AM, Michael J. Mahon wrote:
This was a common technique in radar scopes. (And there it's not even being
used as a frequency multiplier.)
A bit off-topic but IMHO an interesting piece of trivia. By the end of the
20th century there was a PLL in every house. Every house > that had an NTSC
(or PAL) TV to regenerate the color sub-carrier from just 9 cycles of the
"color burst" after line sync. However in the early > days of NTSC they
used a very high Q "LC tank" equivalent - a quartz crystal > that was
excited during the color burst by those 9 periods and kept in sync > till
the next line. Not quite perfect. Probably one of the reasons NTSC is >
claimed by some to stand for Never Twice [the] Same Color. :)
[OT] Speaking of oscillator excitement (kinda pun), here's something
interesting to read, presumably written by the late Jeff Fox:

http://www.greenarraychips.com/home/documents/pub/AP002-OSC.html

One pin oscillator. Hope you both find it interesting.


Very cool!

-michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon