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The power unit "Quartz BP-1" from the beginning of 1978 produced the Kyshtym radio plant. The power supply '' Quartz BP-1 '' is designed to power transistor radio receivers of the type '' Quartz '' or similar, designed to be powered from a constant current source at one of the supply voltages, which are 9, 6 or 4.5 volts 0.6 watt and having a contact device for connecting "Krona" type batteries or an "AL" socket for connecting an external power source in stationary conditions. The power supply unit is powered by an alternating current network of 220 V. The power supply unit with an output voltage of 9 volts is made with a "Krona" type power supply terminal, with a voltage of 4.5 and 6 V and a "ShS" type plug. Rated current in the load at a voltage of 9 V - 30 mA, 6 V - 45 mA, 4.5 V - 60 mA. The maximum current is 100, 100 and 70 mA, respectively. The assembly of elements is printed, the case of the power unit is made of plastic.