Alarm circuit

摘要

A circuit for providing an audible alarm, capable of having a characteristic sound. The acoustic/alert circuit includes a battery and a self-starting voltage multiplier including a capacitor which provides a higher source of voltage to power an associated binary counter and transducer element as well as providing a source of input frequency to the binary counter. The input frequency signal drives the binary counter with its plurality of fractional frequency outputs. At least two of these fractional frequency outputs are used in combination with logic circuitry to generate a modulated complex signal to a gated oscillator means which includes a sound generating transducer.