Portable electric megaphone '' Balsas ''.
Acoustic systems, passive or active, as well as electro-acoustic units, hearing aids, electric megaphones, intercoms ...Electric megaphonesSince the beginning of 1966, the portable electric megaphone "Balsas" has been produced by the Panevezys Electrotechnical Plant. Lithuania. Electric megaphone "Balsas" is designed to amplify speech within a radius of up to 10 meters and can be used by guides, coaches, bus drivers. The electric megaphone consists of a microphone, a transistor amplifier, a loudspeaker and a power supply located in a plastic case. Microphone type DEMSH-1A, loudspeaker type 1GD-28. The electric megaphone amplifier reproduces the audio frequency range 60 ... 5000 Hz, and the loudspeaker 150 ... 6000 Hz. The nominal output power of the amplifier is 1 W. The electric megaphone is powered from two flat batteries KBSL-0.7 or from an 8TsNK-0.45 battery. The consumed current is 250 mA. The weight of the electric megaphone is 1 kg, its dimensions are 195x110x56 mm. The performance of the "Balsas" electric megaphone is maintained when the temperature changes from -40 to + 50 ° С.
