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The universal power supply unit "BPU-77" was produced from the 1st quarter of 1977. The power supply unit is designed to be supplied with stabilized voltage of 9 or 12 volts with a current of up to 0.3 amps of portable household radio equipment (radios, tape recorders, etc.) in stationary living conditions. The power supply unit also provides unstabilized voltage from 10 to 24 volts with a load current of up to 0.4 amperes.