24 Nov
2007
24 Nov
'07
10:27 p.m.
From: cclist at sydex.com
On 24 Nov 2007 at 19:27, dwight elvey wrote:
Hi
I got my math wrong. The fellow is also wrong.
45/60 = .75.
100/.75 = 133.333....
If rounded to 133, you get 45.11278195----
Still, using Tony's multiple method, 400 dots
would work fine. It would be a large disk but
it would work.
Dwight
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75 is a lot of bands. I'd think that it would
need to be a larger
disk. Still 45 for a 60 Hz would be 90. Are you sure your not
thinking of 33 1/3. That is a lot tougher or 78.
Dwight
I'm certain--have a look:
http://www.extremephono.com/free_turntable_strobe_disk.htm
Note that the 50Hz disc is 45.11 RPM
Cheers,
Chuck