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The "Electronic Designer" set (MRK-1) was created in 1971 by the Leningrad Experimental Plant at the SRI "Electrostandard". About 40 cubes of such a designer, each of which has a resistor, a capacitor or a transistor, can collect more than 25 radio receiving circuits and understand the essence of the work of all elements and nodes. If you add another ten cubes, then you can assemble a number of impulse circuits, understand the essence of the operation of an electronic computer, and even assemble its main nodes. And with 100 cubes, you can already engage in serious creative work in the design bureau industry. At the same time, without a soldering iron, wire cutters and wires, any circuit can be assembled in 2 minutes. The electronic designer will soon be produced by the industry, but so far in each circle of radio electronics it can be made by ourselves and applied practically. The most difficult in the electronic designer is the construction of cubes with radio components. Cubes must be made so that you can quickly and securely connect the details in the scheme. It is best to make plastic cubes of 3.5x3.5 cm in size and install 3"¦ 4 magnets in each, attracting cubes to each other and pressing brass or silver-plated contact plates attached to the cubes. The cubes themselves stretch to each other and the electrical circuit quickly grows. The industrial limited-edition version of the "Electronic Designer" was produced by the plant under the name "MRK-1" (Modular radio designer, 1st) since the fall of 1971, but unfortunately there are no photos or descriptions for it.