ULTRASONIC_REMOTE_CONTROL_TESTER

Published:2009/6/24 21:27:00 Author:Jessie | From:SeekIC

This circuit picks up the ultrasonic tone via MIC1, amplifies it, and divides it by 10 in IC U2, a 74LS90. The output of U2 drives an audio amplifier and a piezoelectric element is used as a speaker.



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