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Since the beginning of 1966, the portable electric megaphone "Balsas" has produced the Panevezhe Electrotechnical Plant. Lithuania. The "Balsas" electromegafon is designed to enhance speech in a radius of up to 10 meters and can be used by guides, coaches, bus drivers. The electro megaphone consists of a microphone, a transistor amplifier, a loudspeaker and a power source housed in a plastic case. DEMSH-1A type microphone, 1GD-28 type loudspeaker. The amplifier of the electromegaphone reproduces the sound frequency range of 60 ... 5000 Hz, and the loudspeaker 150 ... 6000 Hz. Nominal output power of the amplifier 1 watt. Power supply of the electro-megaphone is carried out from two flat batteries KBSL-0,7 or from the battery 8TSNK-0.45. Current consumption 250 mA. The weight of an electric megaphone is 1 kg, its dimensions are 195x110x56 mm. The operability of the "Balsas" electromegaphone is maintained when the temperature changes from -40 to 50 ° C.
Based on information from collection of Valery Khartchenko