Abstract: A sound actuated detector comprising a microphone, an elastic cylinder having a flexible bottom adapted to fit tightly around the microphone with the sensing surface of the microphone fitting tightly against the flexible bottom, a mounting base connected to the surface of the cylinder having the flexible bottom, an elastic isolating medium arranged between the base and the surrounding surface to which the detector is attached, and a weight connected to the microphone having a mass such as to eliminate movement of the microphone in response to frequencies above a selected frequency.

Abstract: A two-terminal line-powered control circuit is disclosed in which a triac is used to switch AC power to a load. When the triac is not conducting, a portion of the voltage appearing across it is rectified and filtered and used to supply power to a radio control circuit. When the triac is conducting, the voltage appearing across inverse-parallel connected diodes, which are in series with the triac, is stepped-up using a transformer, then rectified and filtered and used to supply power to the radio control circuit. The radio control circuit is in turn used to control the operation of the triac in response to a remotely transmitted radio signal.

Abstract: A toy playset including a bridge which may be used in a road racing set to emulate the occurence of an explosion. The playset includes a launcher and a toy bridge with a track portion and an actuating device. The track portion includes at least one element thereof which may be operated by the actuating device to project a toy vehicle passing thereover in a manner simulating an explosion.

Abstract: A solid state relay circuit is provided which controls the application of power to multiple loads in a manner which prevents the simultaneous application of power to more than one load. Photovoltaic diode arrays along with phototransistors are employed to control MOSFET output switching devices.