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Automatic gain control circuit to improve the listening effect. The TL is an induction coil for a telephone device that is made by winding a few hundred pieces of permalloy sheets with a 0.08 mm high-strength enamelled wire around several hundred turns. When using, the switch K board is placed on the TL, and the hearing aid is placed beside the telephone, the call content of the telephone can be heard, and the volume control is provided to facilitate the patient to make
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