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  • Constant-voltage transformers designed to deliver energy to the lamp (e.g., halogen) of some rigid endoscopes (e.g., otoscopes, ophthalmoscopes) and illuminators (e.g., larynx, nasopharynx). These transformers are usually connected to the line voltage (e.g., 120 V, 240 V) at the input and deliver a low voltage (e.g., 2.5 V) at the output. Endoscopic constant-voltage transformers are used to deliver a steady voltage to endoscopic lights, thus providing constant illumination while performing diagnosis or other medical procedures. Some of these transformers are also capable of delivering enough power to operate an electrocautery unit.
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