PROGRAMMABLE_FREQUENCY_ADJUSTABLE_RATE_SIREN

Published:2009/7/10 1:42:00 Author:May | From:SeekIC

The LM380 operates as an astable oscillator with the frequency determined by R2/C2. Adding Q1 and driving its base, with the output of an LM3900 wired as a second astable oscillator, acts to gate the output of the LM380 on and off, at a rate fixed by R1/C1.



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