MODULATED AUDIO ANNUNCIATOR PROVIDING STAND-ALONE HIGH VOLTAGE COMPATIBILITY

摘要

An integrated line voltage converter and microprocessor-controlled tone generator allow advanced alarm features to be implemented in standard appliances as powered by a high-voltage line power. An integrated switch may also be used to allow the addition of alarm features to standard appliances as a drop-in replacement for door switches.

主权项

1. An appliance alarm for an appliance of a type providing a line power source of line-voltage alternating current, the appliance alarm comprising:
a housing providing a mounting element for attaching the appliance alarm to the appliance; a conductor system providing an electrical connection between the appliance alarm and line power from the appliance; and a circuit card retained at least in part within the housing and including: (a) a power converter converting line-voltage alternating current to logic level direct-current; (b) a audio annunciator; and (c) a controller circuit receiving the logic level direct-current and providing an output line communicating with the audio annunciator to provide a modulated signal to the audio annunciator to produce a distinctive modulated audio tone.