NARROW_BANDPASS_FOR_SPEECH

Published:2009/7/2 7:36:00 Author:May | From:SeekIC

Simple audio filter provides about 20-dB gain at bandwidth of 80 Hz Bandwidth can be narrowed tolimits of unintelligibility by adjusting 10K pot.Input is plugged into phone jack of receiver, and headphones are connected to output. Transistors are SK3004 or equivalent.-Circuits, 73 Magazine, Jan.1974 p 125.



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