Power Buzzer

  
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A powerful buzzer in the room, combined with a pushbutton at the bottom of the stairs or in the kitchen, could be very handy in such situations. The heart of this circuit is formed by IC1, a TDA2030. This IC has built-in thermal protection, so it`s not likely to quickly give up the ghost. R1 and R2 apply a voltage equal to half the supply voltage to the plus input of the opamp. R3 provides
Power Buzzer - schematic

positive feedback. Finally, the combination of C2, R4 and trimmer P12 determines the oscillation frequency of the circuit. Power Buzzer Circuit Diagram.



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