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Since 1977, the modular radio designer "Electronic Cubes" (MRK-2) has produced the Leningrad Experimental Plant at the Scientific Research Institute "Electrostandard". The electronic cubes modular radio designer (MRK-2) is designed to enhance the knowledge and practical skills of middle and older students in the field of radio electronics. "Electronic cubes" can also be an entertaining toy for children of primary school age. The radio constructor will also be useful to novice radio amateurs. With it you can without the use of soldering, tools and additional wires to collect various electronic devices. The manual attached to the radio designer contains 40 electronic circuits. The power supply of the circuits is the Krone battery.