19. Periodic Action
A. Replace a continuous action with a periodic or pulsed action.
Example:
• Hitting something repeatedly with a hammer.
• Replacing a continuous siren with a pulsed sound.
• An impact wrench loosens corroded nuts using impulses rather than continuous force.
B. If an action is already periodic, change its frequency.
Example:
• Use frequency modulation to convey information, instead of Morse code.
• Replace a continuous siren with sound that changes amplitude and frequency.
C. Use pulse between impulses to provide additional action.
Example:
• A warning lamp flashes so that it is even more noticeable than when continuously lit.
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