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Sensors and Transducers
Quick questions on Output transducers explained: O-Level Electronics Sensors and Transducers
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What is driving a high-current output?Show answer
Many outputs (lamps, motors, buzzers) need more current than a logic gate or sensor stage can supply directly. The solution is to feed the small signal to a transistor through a base resistor, and let the transistor switch the larger current from the supply. For very large or mains loads, the transistor switches a relay whose contacts carry the heavy current.
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