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Set "Electronic Designer" (MRK-1) was created in 1971 by the Leningrad Experimental Plant at the Research Institute "Electrostandard".
From about 40 cubes of such a constructor, each of which has a resistor, capacitor or transistor, you can collect more than 25 radio circuits and understand the essence of the work of all elements and nodes.
If you add a dozen more cubes, you can collect a number of impulse circuits, understand the essence of the operation of an electronic computer and even assemble its main components.
And with 100 cubes, you can already do serious creative work in the design bureaus of industry.
At the same time, without soldering irons, wire cutters and wires, any circuit can be assembled in 2 minutes.
The electronic designer will soon be released by industry, but so far in each circle of radio electronics it can be done by ourselves and applied in practice.
The most difficult in the electronic constructor is the construction of blocks with radio components.
The cubes must be made so that it is possible to quickly and reliably connect the parts into a circuit.
It is best to make plastic cubes with a size of 3.5x3.5 cm and mount into each 3 ... 4 magnets that attract the cubes to each other and press while brass or silver-plated contact plates mounted on the cubes.
The cubes themselves are pulled towards each other and the electrical circuit grows rapidly.
The small-scale industrial 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.