Radio solid state crescendo volume alarm

Abstract

Abstract A solid state crescendo alarm system, in a preferred embodiment as a part of a clock radio, in the radio incorporated such that at a predetermined point in time the crescendo circuit is activated by opening the clock time alarm switch and thereafter the volume of the crescendo alarm system gradually increases up to the maximum at which the volume control had been set; the increase in volume is effected by feeding the volume control signal to a gate terminal of an n-channel field effect transistor of which the drain terminal is connected in series with the radio''s first audio stage, and of which the transistor''s gate source voltage is (upon activation of the radio-clock time alarm) gradually decreased by virtue of a control transistor switch, which transistor switch''s base emitter junction receives an emitter junction from the drain terminal of another n-channel field effect transistor initiated by about 12 volts when the time alarm switch is closed. As the voltage is drained from the volume signal regulating transistor''s gate, the transistor offers a decreasing resistance to the signal current flowing to the radio''s first audio stage.

Inventors

• 👤 Alfred S Pomerantz
• 👤 Imre A Andrassy

Bibliographic Details