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Power supply units "BP-9/5", "BP-12/5", "BP-12/10" have been manufactured since 1970. Unified stabilized power supplies are designed to supply constant stabilized voltage of 9 or 12 V of portable tape recorders or receivers. All units have the same design and similar electrical circuit. The only difference is in the dimensions of the power transformer and, accordingly, in the dimensions of the cases, the mass of the power supply units and their power.