A PORTABLE MULTIPURPOSE RADIO RECEIVER DEVICE FOR USE PARTICULARY, THOUGH NOT EXCLUSIVELY, ON VEHICLES

摘要

A portable multipurpose radio receiver device for use particularly, though not exclusively, on vehicles, comprising a radio receiver circuit operated by a power supply and a main switch, characterised in that the said device also comprises first, second and third levels provided, respectively, for the audio stage of the receiver circuit, the remaining part of the radio receiver circuit and the speaker; and an auxiliary switch normally connecting the first and second leads together to complete the receiver circuit, the said auxiliary switch being operable, when required, to simultaneously (i) disconnect the first and second leads so as to isolate the audio stage circuit (along with the speaker) from the said remaining part of the receiver circuit (ii) connect the power supply to the audio stage circuit so as to furnish power thereto regardless as to whether the main switch is open and (iii) connect the first and third leads together to form a feed-back line, so as to produce an audible sound at the speaker.