Siren


Posted on Jun 18, 2012    6665

This circuit uses one of the LM389 transistors.to gate the power amplifier on and off by applying the muting technique. The other transistors form a cross-coupled multivibrator circuit that controls the rate of the square-wave oscillator.


Siren
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The power amplifier is used as the square-wave oscillator with individual frequency adjust provided by potentiometer R2B.




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