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Radio constructor "ULF-1" (Low Frequency Amplifier) "‹"‹since 1981 produced the Moscow plant of measuring equipment. The set of "ULF-1" consists of the assembled and configured ULF board and components. It is intended for designing radio equipment by novice radio amateurs. The supply voltage is 12 V. The load resistance is 4 ... 16 ohms. Rated output power 1 watt. Harmonic coefficient 3%. The range of amplified frequencies from 80 to 12500 Hz.