Soundtrack attachment `` Mirage ''.
Service devices.The "Mirage" soundtrack has been produced presumably since 1975. The set-top box is designed for wireless listening to the soundtrack of household equipment within the room. The set-top box itself contains a circuit of a highly sensitive audio frequency amplifier, at the input of which a low-frequency coil of a magnetic antenna is connected. The amplifier output is driven to the headphone. The output of the PA of a tape recorder, an electrophone, a TV or a receiver is loaded on a closed loop of a wire, which is stretched on the floor or on the wall of the room. An alternating electromagnetic field of sound frequency is formed in the loop, which is received by the Mirage prefix. Somewhere in the early 80s, the appearance and price of the console changed. The prefix was produced until the early 90s.
