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There is a type of automatic timer manufactured by Kaiser, Philips, and others that by means of a photoelectric sensor (like the one in the photo or mounted inside the easel), is capable of regulating the exposure time according to the light projected by the enlarger, through the negative, on the photographic paper, magnitude inversely ...
On one hand, timers and alarms are important: Their job is to signal that a task has finished, whether that be an oven timer, incoming call ringtone or your microwave letting you know that your ...
The timer may switch equipment on, off, or both, at a preset time or times, after a preset interval, or cyclically. A countdown time switch switches power, usually off, after a preset time. A cyclical timer switches equipment both on and off at preset times over a period, then repeats the cycle; the period is usually 24 hours or 7 days.
All microwave ovens use a timer to switch off the oven at the end of the cooking time. Microwave ovens heat food without getting hot themselves. Taking a pot off a stove, unless it is an induction cooktop , leaves a potentially dangerous heating element or trivet that remains hot for some time.
A motor-driven cam (usually relatively slow-speed) and one or more micro switches form a timer mechanism. The snap-switch mechanism can be enclosed in a metal housing including actuating levers, plungers, or rollers, forming a limit switch useful for control of machine tools or electrically-driven machinery.
Pulse generators are also used to drive devices such as switches, lasers and optical components, modulators, intensifiers, and resistive loads. The output of a pulse generator may also be used as the modulation signal for a signal generator. Non-electronic applications include those in material science, medical, physics, and chemistry.
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