SIREN_WITH_MUTING

Published:2009/7/22 1:13:00 Author:Jessie | From:SeekIC

National LM389 array having three transistors and power opamp on same chip uses opamp as square-wave oscillator whose frequency is adjusted with R2B. One transistor is used in muting circuit to gate power amplifier on and off, while other two transistors form cross-coupled MVBR that controls rate of square-wave oscillator.- Audio Handbook, National Semiconductor, Santa Clara, CA, 1977, p 4-33-4-37.



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