This circuit can either directly supply a piezoelectric transducer (BZ) or a stage with a loudspeaker (BD135). The circuit produces alternating sounds that depend on the feedback resistors and capacitors. The circuit works with voltages from 3 to 12 V. With voltages above 9 V the transistor must be equipped with a heat radiator. This circuit is from the book Robotics, Mechatronics and Artificial Intelligence by Newton C. Braga, published in the United States.
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