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Help me! filter utrasonic signal from Power line(50, 300Hz)

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ducnguyenvn

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300hz filter

Input signal: Power line include 50Hz or 300Hz /220VAC and ultrasonic signal or FM signal (7kHz, 20khz, 50kHz).

Output signal: ultrasonic signal or FM signal, no offset, DC = 0 (no oscillation).
 

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