Abstract: Herein disclosed is a blower which comprises a fan, means for driving said fan, a body housing or guard mounting said fan therein, a wind deflector mounted in the front opening of said body so that it can rotate in said front opening, and a rear guard mounted in the rear opening of said body. Said wind deflector is formed with changing vanes which are made receptive of the air wind generated by said fan for imparting a rotational force to said wind deflector. Moreover, the changing vanes are made at least partially so movable that they can be adjusted to have an arbitrary vane angle for changing a rotating speed on a rotating direction of said wind deflector.

Abstract: In an AM radio signal receiver, the value of Q of the input tuning circuit is varied in accordance with information indicative of the magnitude of the received signal. This information may be derived from the intermediate frequency (IF) signal processing stage of a superheterodyne receiver. In such a case, the IF signal is applied to a narrow-band filter having a pass band which is narrower than that of the IF signal processing stage. The amplitude of the output signal from the narrow-band filter is then detected to control a variable resistance element which is connected in parallel with winding of an input tuning coil so that the value of Q of the input tuning circuit is lowered when receiving a broadcasting signal having relatively high intensity. The invention may be adapted to an AM stereo receiver. In this case, the variable resistance element is controlled by both a signal indicative of the amplitude of the received signal and a signal indicating that the received signal is a stereo signal.