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

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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