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Date: 11/05/02 at 9:32 AM
Posted by: zach
E-mail: shaoliang@aiofm.ac.cn

I'm using LM1812 chip to constitute a ultrasonic transmitter/receiver circuit,but I cannot know how can choose transformer to match my ultrasonic transducer,I cannot know my transducer's resonant impedance.How can I choose transformer for safely use? I've destroyed 3 LM1812 chip because of overload current I guess.
thanks for your help

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