Extras

This animation may take a few seconds to start, and may need a faster PC/video system to run smoothly, especially while running other processor/graphics-intensive tasks such as videos.
One full cycle = 2 seconds, or 1/2 cycle per sec = 0.5 Hz
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https://addons.mozilla.org/en-US/firefox/addon/half-hz-sine-wave-animated/#id=371698
See all my personas here:
https://addons.mozilla.org/en-US/firefox/collections/BrianZ/personas/
(animation, sine, waves, frequency, green, yellow, ripple, light, sound)
(c) 2012 BrianZ All Rights Reserved